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Articles 1 - 30 of 17328
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Socio-Economic And Climate Change In Mongolia - Effects On Grassland Ecosystems, C Opp
Socio-Economic And Climate Change In Mongolia - Effects On Grassland Ecosystems, C Opp
IGC Proceedings (1997-2023)
In Mongolia, in combination with strong changes of the whole society during the past 76 years, from the feudal system to socialism and from the socialist system of planned development to the market economy, there are a lot of changes in the use of natural resources all over the country. In consequence of this a lot of effects on grassland ecosystems, caused by socio-economic and climate driving factors, were observed and studied in different scales: zonal, regional, local.
Policy Options For Decreasing N And P2o5 Losses From Grassland Based Dairy Farms, P.B M. Berentsen, G.W J. Giesen
Policy Options For Decreasing N And P2o5 Losses From Grassland Based Dairy Farms, P.B M. Berentsen, G.W J. Giesen
IGC Proceedings (1997-2023)
Policy instruments for reducing nutrient losses include extension and education, research, financial incentives such as subsidies and levies, and regulations. The potential of these instruments for reducing nitrogen (N), phosphate (P2O5), and ammonia (NH3) losses is examined for Dutch specialized dairy farms on sandy soils. A linear programming model is used to estimate policy impacts. Results indicate that efficiency improvements through extension, education, and research alone have the potential to decrease total N losses to government target levels in 2005 and to erase 92% of the gap between base and target P2O5 losses, but only 24% of the corresponding NH3 …
Relationship Between Broadleaf Dock (Rumex Obtusifolius L.) And Seasonal Yield Of Orchardgrass Grazed Pasture, Y Iijima, Y Kurokawa, T Monya, Y Suzuki
Relationship Between Broadleaf Dock (Rumex Obtusifolius L.) And Seasonal Yield Of Orchardgrass Grazed Pasture, Y Iijima, Y Kurokawa, T Monya, Y Suzuki
IGC Proceedings (1997-2023)
In order to grasp the ecology of R. obtusifolius and the effects of it on seasonal yield of grass in grazing pasture, we investigated seasonal sward characteristics and dry matter yield in grazing pasture. Dry matter yield and coverage of R. obtusifolius predominated those of grass after mid-June and mid-August, respectively. Throughout the year the coverage of R. obtusifolius negatively correlated to the grass yield. After August, the grass yield was negatively related to the yield and the population density of R. obtusifolius. From the facts described above, R. obtusifolius seems to reduce grass yield throughout the year, especially …
Productivity And Genotypic Diversity Of Trifolium Ambiguum In The Central Caucasian Mountains, Georgia, R G. Patterson, P R. Espie
Productivity And Genotypic Diversity Of Trifolium Ambiguum In The Central Caucasian Mountains, Georgia, R G. Patterson, P R. Espie
IGC Proceedings (1997-2023)
Trifolium ambiguum occurred in12 diverse grassland communities, ranging from 1700 m to 2850 m, in the Kasbegi region, Central Caucasus. Total herbage mass in mid summer ranged from 310 to 763 g/m2with T. ambiguum composition ranging from 0.5 to 51%. Maximum T. ambiguum production occurred in fertile, regularly mown hay meadows, but was reduced in severely grazed pastures. It has persisted in these communities after centuries of grazing or cutting, without fertiliser input. T. ambiguum ploidy levels were predominantly diploid (82% frequency of occurrence), often in conjunction with triploid (18%) or tetraploid (27%) genotypes. The triploid T. ambiguum genotype ( …
Evaluation Of Lolium Perenne And Lolium Multiflorum Cultivars In Chilean Andisols, F R. Demanet, M G. Mora
Evaluation Of Lolium Perenne And Lolium Multiflorum Cultivars In Chilean Andisols, F R. Demanet, M G. Mora
IGC Proceedings (1997-2023)
During the seasons 1992/93, 1993/94, 1994/95, the productive pattern of seven cultivars of Lolium perenne: Nui, Ellett, Santa Elvira, Solo, Embassy, Super Nui, Marathon and five Lolium multiflorum: Tetrone, Montblanc, Concord, Aberoscar, Abercomo, was evaluated in a dryland area of Southern Chile. The average season at yield reached by the evaluated cultivars was statistically similar (P< 0.05). However, Ellett, Solo and Marathon, showed a higher persistence and Tetrone and Montblanc presented a plant structure which might allow a greater complementation with Trifolium pratense.
Effect Of White Clover Defoliation On Seed Production And Maturity, Slepetys, R Dapkus
Effect Of White Clover Defoliation On Seed Production And Maturity, Slepetys, R Dapkus
IGC Proceedings (1997-2023)
Experiments were carried out in Lithuania over the period 1990- 1995. They involved white clover (Trifolium repens L.) cultivars Atoliai (large - leaved) and Bitunai (intermediate - leaved). Different defoliation treatments were carried out at a height of 5, 10 and 15 cm every week over the period from 7 May to 18 June. On 21-28 May, two more treatments consisting of an application with 0.5 and 1.0 l ha-1 reglone were added. When defoliation was carried out on 11-18 June, the seed of cv. Bitunai and cv. Atoliai matured 7 d and 13 d later, respectively than the …
Utilization Of Regrowth For Forage In Seed Stands Of Meadow Fescue (Festuca Pratensis Huds.), Lars T. Havstad
Utilization Of Regrowth For Forage In Seed Stands Of Meadow Fescue (Festuca Pratensis Huds.), Lars T. Havstad
IGC Proceedings (1997-2023)
Intensive utilization of autumn regrowth for forage production was compared to other autumn treatments in nine seed production fields of meadow fescue (Festuca pratensis) during 1993-96. Uncut plots without a N application in autumn always had the lowest number of reproductive tillers and the lowest subsequent year seed yields. Intensive utilization of regrowth, by application of 80 kg N ha-1 immediately after seed harvest and forage harvests in September or October, did not have any negative impact on the following yearsí seed yields. Delaying forage harvest from 10 September to 10 October increased forage yields, but lowered the …
Undersowing Creeping Red Fescue (Festuca Rubra Var Rubra) For Seed Production In Winter And Spring Wheat Cover Crops, T S. Aamlid
Undersowing Creeping Red Fescue (Festuca Rubra Var Rubra) For Seed Production In Winter And Spring Wheat Cover Crops, T S. Aamlid
IGC Proceedings (1997-2023)
Sowing red fescue (Festuca rubra L.) seed crops in autumn without cover crop or in winter wheat sown at two sowing rates (100 vs. 200 kg ha-1) and two row spacings (13 vs. 26 cm) was compared to spring establishment without cover crop or in spring wheat at the same sowing rates and row spacings. Yields of winter and spring wheat averaged 5190 and 4106 kg ha-1, respectively. First years’ seed yields of red fescue were, on average, 7% higher after spring- than after autumn sowing; with cover crop this can be explained by the taller plants of winter …
Ecological Site Database- Basic Site Information For Resource Analysis And Decision Making, S L. Ekblad, J R. Carlson, W R. Oaks
Ecological Site Database- Basic Site Information For Resource Analysis And Decision Making, S L. Ekblad, J R. Carlson, W R. Oaks
IGC Proceedings (1997-2023)
The USDA Natural Resource Conservation Service (NRCS) describes and interprets range, native pasture, grazable forest, pasture, and hayland with ecological site descriptions and forage suitability groups. Ecological sites have evolved from agency range and woodland site descriptions, and have integrated alternate and more recent concepts with the traditional succession-retrogression model for site classification and interpretation. Ecological site interpretations are based on vegetation sampling by weight and composition, and other field data collection. Sample data is recorded and managed in the Ecological Site Information System (ESIS) and is analyzed to identify and develop site and suitability group descriptions. ESIS provides data …
Australian And Us Experiences With Transfer Of Rangeland Improvement Technologies: A Comparative Analysis, A P. Thurow, N Macleod, J R. Conner
Australian And Us Experiences With Transfer Of Rangeland Improvement Technologies: A Comparative Analysis, A P. Thurow, N Macleod, J R. Conner
IGC Proceedings (1997-2023)
American and Australian range economists work in tandem with range ecologists and management specialists to develop and analyze strategies for technology transfer. Historically, this process has developed around a model aimed at communication with a narrow target group (ranchers) with easily-defined and homogeneous goals (continuously improving income). In accord with this traditional model of technology transfer, the focus of range economists’ inquiries was once to assess the cost-effectiveness of grazing improvement technologies (Conner, 1985). It is a relatively recent phenomenon that both American and Australian range technology transfer agents are encountering an increasingly broad social and ecological agenda. Ranchers recognize …
Farmer Participation In The Development And Implementation Of A New Technology: Introduction Of Lucerne (Medicago Sativa L.), A Perennial Legume, Into South-West Western Australia, L J. Blacklow, P Cocks
Farmer Participation In The Development And Implementation Of A New Technology: Introduction Of Lucerne (Medicago Sativa L.), A Perennial Legume, Into South-West Western Australia, L J. Blacklow, P Cocks
IGC Proceedings (1997-2023)
Australia since its demise due to insect attack in the 1970s. With new insect resistant varieties lucerne is once again becoming a viable pasture option for farmers. There is however, a slow rate of adoption of lucerne for a number of social and economic factors. The main limitations to the adoption of lucerne by farmers are past negative experience, farm systems dominated by annual pastures, changing wool and wheat commodity prices and perceived establishment and management difficulties. To overcome these socio-economic limitations a Model of Lucerne Adoption was developed in which the target group for the technology, the farmer, took …
The Punctuated Arena Model- A New Approach To Tackling Technology Transfer Failure, N D. Macleod, A D. Shulman
The Punctuated Arena Model- A New Approach To Tackling Technology Transfer Failure, N D. Macleod, A D. Shulman
IGC Proceedings (1997-2023)
Valuation of the worth of research and development activities is increasingly shifting from outputs to outcomes. The technology transfer record of agricultural R&D focused on pastures and resource management remains generally poor. Participatory R&D approaches have been developed and promoted to overcome this, but these also have performance problems. Based on the authors’ experience with R&D and communication management a Punctuated Arena Model has been developed which is argued to offer scope for improving technology transfer outcomes.
Changes In The Distribution Of Carbohydrates Due To Water Stress And Root-Shoot Ratio As An Index Of Drought Resistance In Ecotypes Of Adesmia Bicolor (Poir.) D.C., B G. Neves-Piestun, Armando Olano, Dan Piestun
Changes In The Distribution Of Carbohydrates Due To Water Stress And Root-Shoot Ratio As An Index Of Drought Resistance In Ecotypes Of Adesmia Bicolor (Poir.) D.C., B G. Neves-Piestun, Armando Olano, Dan Piestun
IGC Proceedings (1997-2023)
The genera Adesmia, is found in the “El Plata” area. Adesmia bicolor (Poir). D.C. is one of the most common species in Uruguay that belongs to this genera. In this study, three ecotypes were collected from different kinds of environments. Ecotypes 016, 2316 and 7017, came from superficial-soil, clay-soil and sandy soil, respectively. The ecotypes of Adesmia bicolor (Poir.) DC. were studied under water-stress conditions (two levels), during two stages: vegetative phase and beginning of blossom. In both stages, leaf-water potential (LWP), leaf-relative-water content (LRWC), leaf-dry matter (LDM), stem-dry matter (SDM) and root-dry matter (RDM) were measured, while root-shoot ratio …
Can The Restoration Of Degraded Rangelands Ever Be Economic?, N D. Macleod, J C. Noble, J R. Brown
Can The Restoration Of Degraded Rangelands Ever Be Economic?, N D. Macleod, J C. Noble, J R. Brown
IGC Proceedings (1997-2023)
Degradation of rangeland pastures in Australia is widespread and ongoing. The characteristics of many restoration technologies in relation to land values contribute to a perception of their being uneconomic. However, while this might be true within the general context of broadscale application, it need not be the case in specific instances. Both the underlying contexts and processes need to be considered in assessing the economic value of a given restoration technique for a given degradation problem.
The Effect Of Different Winter Utilization Periods Of A C4 Subtropic Foggage On The Growth Of Weaners, I F. Reckling, G.H J. Kruger
The Effect Of Different Winter Utilization Periods Of A C4 Subtropic Foggage On The Growth Of Weaners, I F. Reckling, G.H J. Kruger
IGC Proceedings (1997-2023)
A significant (P<0.05) increase in lick consumption was found, as winter progressed, which was attributed to a significant decline in the quality (P<0.05) of Digitaria eriantha foggage. Harvested treatments resulted in a significant (P<0.05) decline in residual soil nitrogen levels compared to unharvested treatments. Losses, due to trampling, on average was 21.25%. It is advocated that Digitaria eriantha ought to be utilised in summer and is only suitable for maintenance if utilised in winter.
Carbon Sequestration- Additional Environmental Benefits Of Forage In The Pfra Permanent Cover Program, G M. Luciuk
Carbon Sequestration- Additional Environmental Benefits Of Forage In The Pfra Permanent Cover Program, G M. Luciuk
IGC Proceedings (1997-2023)
International concern about greenhouse gases and their impacts on climate change has added to the need for an understanding of carbon sequestered in agricultural soils. This paper evaluates the carbon sequestration potentials of the 522 000 hectares converted from annual cultivation to forages under the Prairie Farm Rehabilitation Administration’s (PFRA) Permanent Cover Program (PCP). The 15 000 PCP sites in the prairie provinces of Canada are matched to their dominant soil characteristics. Estimates of carbon losses due to annual crop cultivation are determined for these soil characteristics, and sequestration potentials under the permanent cover condition are presented. Estimates of societal …
Biomass Partitioning In Grasses Subjected To Defoliation, M Gutman, I Noy-Meir, D Pluda, S Rothman
Biomass Partitioning In Grasses Subjected To Defoliation, M Gutman, I Noy-Meir, D Pluda, S Rothman
IGC Proceedings (1997-2023)
Containerized plants of Perennial wild barley (Hordeum bulbosum) grown from corms and of Wild emmer wheat (Tritium diccocoides) grown from seeds, were grown in environmental conditions comparable to those encountered under field conditions. Both species were subjected to 3 defoliation frequencies ( once, twice and three times during the season) each at 3 different clipping heights (1, 2.5 and 5 cm above ground level ) plus a control treatment (10 treatments in all). Wild emmer wheat control plants had significantly higher cumulative total and reproductive biomass over all harvests than all clipped plants. Clipping height and …
Performance Of Timothy (Phleum Pratense L.) And Meadow Fescue (Festuca Pratensis Huds.) In Mixtures With Lucerne Or Red Clover, M A. Halling
Performance Of Timothy (Phleum Pratense L.) And Meadow Fescue (Festuca Pratensis Huds.) In Mixtures With Lucerne Or Red Clover, M A. Halling
IGC Proceedings (1997-2023)
Results on the botanical composition of timothy and meadow fescue from 14 field trials in south and central Sweden are presented. Each trial had three years of ley. Treatments were two or three harvests a year, and 0, 100 or 200 kg ha-1 nitrogen per season. Three seed mixtures were used: a mixture of timothy and meadow fescue, and either lucerne or red clover mixed with timothy and meadow fescue. The results show that there is a significant correlation between harvesting system and nitrogen application on the percentage of timothy and meadow fescue. At two harvests, the proportion of timothy …
The Effect Of Phytotoxic Substances In Permanent Grassland, E Haugland, R Elven
The Effect Of Phytotoxic Substances In Permanent Grassland, E Haugland, R Elven
IGC Proceedings (1997-2023)
The concentration of phytotoxic substances in permanent grassland was studied and related to botanical composition in a two year study. Species that were negatively correlated to growth retardation varied between the two years. This may have been caused by variation in growth conditions between the two years, but may also indicate that single plant species are not the main source for the phytotoxic substances. Dead decomposing tissue may instead be the main source of phytotoxic substances in permanent grassland.
Dryland Grazing Evaluation Of Grasslands Gala Grazing Brome, B L. Sutherland
Dryland Grazing Evaluation Of Grasslands Gala Grazing Brome, B L. Sutherland
IGC Proceedings (1997-2023)
Grasslands Gala grazing brome (Bromus stamineus), was evaluated for seasonal production and persistence under dryland conditions. Gala was compared with cultivars from three different Bromus species and a high endophyte ryegrass, under three sheep grazing managements which varied in duration and intensity. Seasonal herbage yields indicated that Gala persisted under all managements, but was more productive under short and medium rotation grazing than long rotation lax grazing. Results of this five year evaluation indicate that Gala compares favourably with existing cultivars, with its broad range of tolerances making it a desirable option as a perennial in temperate dryland pastoral …
Effect Of Frequency And Intensity Of Defoliation On Oat- Vetch Mixture, M J. Arzadun, M H. Vallejos, M M. Piersanti
Effect Of Frequency And Intensity Of Defoliation On Oat- Vetch Mixture, M J. Arzadun, M H. Vallejos, M M. Piersanti
IGC Proceedings (1997-2023)
An experiment was conducted to evaluate the effect of different cutting regimes on productivity and complementarity between oat and vetch in a mixture. The treatments were allocated in a factorial design on a split-split-plot disposition: they were 3 cutting frequencies (each 35, 70 and 105 days), 3 cutting heights (2, 8 and 14 cm above ground) and 3 crops (oat, vetch and the 1:1 mixture). Forage production (dry matter per hectare) and complementarity between species Relative Yield Total (RYT) were evaluated. The highest forage production (p- 0.05) was obtained with a cutting height of 2 cm and a frequency of …
Grazing Strategies To Increase Persistence Of Phalaris Aquatica L. In Summer Rainfall Areas Of Temperate Australia, G M. Lodge
IGC Proceedings (1997-2023)
A grazing strategy of resting Phalaris aquatica L. pastures in springearly summer (to increase the presence of flowering tillers over summer) and autumn (to allow bud and tiller development) markedly increased its persistence, compared with continuously grazed plots in a summer rainfall environment.
Analysis Of Pasture Management Practices Within A Pasture Composition Matrix Model, D R. Kemp, D L. Michalk, P M. Dowling, T A. Klein
Analysis Of Pasture Management Practices Within A Pasture Composition Matrix Model, D R. Kemp, D L. Michalk, P M. Dowling, T A. Klein
IGC Proceedings (1997-2023)
In extensive livestock industries better pasture management is seen as the main strategy to improve poor quality pastures, or to maintain newly sown ones. Pasture management practices need to be evaluated within a framework that considers the desirability of changes in species composition rather than simply considering the statistical significance of the results. This can be done through the state and transition model used in rangelands management, but difficulties were found when applying that model to temperate perennial pastures as the interactions between species often showed continuous distributions. An alternative pasture composition matrix model based on the ratios of functional …
Evaluation Of Grassland Advance Tall Fescue Under Grazing, R.J M. Hay, T B. Lyons, H S. Easton
Evaluation Of Grassland Advance Tall Fescue Under Grazing, R.J M. Hay, T B. Lyons, H S. Easton
IGC Proceedings (1997-2023)
Four cultivars of tall fescue (Festuca arundinacea Schreb.) were evaluated under sheep grazing at Palmerston North, New Zealand to assess the productivity and persistence of the newly released cultivar Grasslands Advance. Results from four years under grazing showed Grasslands Advance to be a considerable improvement over the older cultivar Grasslands Roa in both total sward yield and in dry matter contribution of tall fescue. It outperformed the other three cultivars in years 2 and 3 and was not significantly different to Grasslands Roa and AU Triumph in year 1 or AU Triumph in year 4. Seasonal production was excellent …
The Effect Of Ladino Clover Mixture With Some Grasses On Dm Yield, Botanical Compsosition And Season Nitrogen Activity, H W. Lee, C H. Kim
The Effect Of Ladino Clover Mixture With Some Grasses On Dm Yield, Botanical Compsosition And Season Nitrogen Activity, H W. Lee, C H. Kim
IGC Proceedings (1997-2023)
The effect of ladino clover mixture with some grasses on DM production, botanical composition and seasonal nitrogen fixation activity was examined under field conditions in two consecutive years. Treatment consisted of a clover mixture with four grasses and a reference crop which was grass grown alone. DM production of second year Perennial ryegrass, Tall fescue plus clover mixture was greater than plot growing grasses but almost the same as Timothy and Orchardgrass both with and without clover. Yield in the third year was higher than that of the clover mixture treatment. Ladino clover content was increased from 26% in 1992 …
Effects Of Defoliation Frequency On The Persistency Of Oversown Temperate Legumes Into A Natural Pasture, J C. Millot, R A. Zanoniani, S Saldanha
Effects Of Defoliation Frequency On The Persistency Of Oversown Temperate Legumes Into A Natural Pasture, J C. Millot, R A. Zanoniani, S Saldanha
IGC Proceedings (1997-2023)
The objective of this study was to study the establishment dynamics and persistence of a legume mixture oversown into natural grasslands under five different grazing management systems. Topographic position had the most significant effect on establishment and persistence. The lowlands were the best sites for legume establishment and persistence. Two years of previous management changed the ground cover components affecting the germination pattern of introduced seeds. The more frequent grazing treatments increased the total number of established legumes and their persistence throughout five years of grazing in the lowlands. Legume persistence on the slopes was generally shorter and was optimized …
Frequent Grazing By Sheep Reduced Caucasian Clover Cover And Rhizome Mass In Ryegrass Pasture, R J. Lucas, A.J E. Moorhead, W W. Nichol, P Jarvis
Frequent Grazing By Sheep Reduced Caucasian Clover Cover And Rhizome Mass In Ryegrass Pasture, R J. Lucas, A.J E. Moorhead, W W. Nichol, P Jarvis
IGC Proceedings (1997-2023)
The responses of hexaploid Caucasian clover (Trifolium ambiguum) to four contrasting grazing regimes were compared with white clover (T. repens ) in a high endophyte hybrid ryegrass pasture on a fertile lowland site. After two years, frequent grazing reduced Caucasian clover cover to 10% compared with 25.5% in infrequently grazed treatments (mean spelling time 25 days). Similarly, Caucasian clover rhizome plus root dry weight was reduced by frequent grazing (78 g DM/m2 sampled to 100 mm depth compared with 322 g DM/m2). White clover was encouraged by frequent defoliation (21% cover) in contrast to Caucasian clover. Ryegrass tiller …
Development And Fate Of Seedlings Of Three Temperate Legumes Following Oversowing, M H. Awan, P D. Kemp, D J. Barker, M A. Choudhary
Development And Fate Of Seedlings Of Three Temperate Legumes Following Oversowing, M H. Awan, P D. Kemp, D J. Barker, M A. Choudhary
IGC Proceedings (1997-2023)
Oversown seeds of subterranean clover (Trifolium subterraneum L.), strawberry clover (T. fragiferum L.) and caucasian clover (T. ambiguum Bieb.) were monitored for 40 days to identify the stage of development at which the seed of these temperate pasture legumes failed at varying moisture levels. Intact sods of glyphosate-sprayed pasture were taken to a glasshouse, subjected to factorial combination of three soil surface moisture levels (low, medium, high) and three legume species. Overall, 70, 52 and 31% of seed of subterranean, strawberry and caucasian clovers,respectively, produced a visible radicle or seedling. The greatest loss of potential seedlings occured following …
Influence Of Five Cutting Frequencies On The Production Of Medicago Sativa Cultivars In The Boland Of South Africa, T Oberholzer, J M. Van Heerden
Influence Of Five Cutting Frequencies On The Production Of Medicago Sativa Cultivars In The Boland Of South Africa, T Oberholzer, J M. Van Heerden
IGC Proceedings (1997-2023)
The use of fixed interval cutting management for lucerne was studied for four cultivars (CUF101, Condor, SA Standard and Alfagraze) of four dormancy classes. Five fixed cutting intervals ranging from two to ten weeks were imposed for three years on irrigated stands at Elsenburg Research Station in the Boland of South Africa. The experimental design was a 4 by 5 split-plot randomised block with three replications. The four main plots were four cultivars split into five subplots containing five cutting treatments. The more winter dormant cultivar, Alfagraze, was least sensitive to cutting frequency and relatively more productive than the other …
Effects Of Grazing And Mowing On Leymus Chinensis Grassland In The Songnen Plain Of Northeastern China, R Z. Wang, E A. Ripley
Effects Of Grazing And Mowing On Leymus Chinensis Grassland In The Songnen Plain Of Northeastern China, R Z. Wang, E A. Ripley
IGC Proceedings (1997-2023)
Effects of mowing and grazing on a Leymus chinensis grassland in the Songnen plain of northeastern China were studied using eight replicates of four grazing and mowing treatments. Canopy cover and biomass of the dominant species (L. chinensis) were lower, and cover of the halophyte Suaeda corniculata higher, on grazed than ungrazed; ungrazed plots showed a response to mowing, but not grazing; species diversity increased with grazing and mowing. This study found dissimilar effects of grazing and mowing on plant populations, canopy biomass and structure in L. chinensis grassland. Possible interactions between the principal disturbances on the grassland are …