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Articles 1 - 4 of 4
Full-Text Articles in Plant Sciences
Effects Of Experimental Nitrogen Additions On Plant Diversity In An Old-Growth Tropical Forest, Xiankai Lu, Jiangming Mo, Frank S. Gilliam, Guoyi Zhou, Yunting Fang
Effects Of Experimental Nitrogen Additions On Plant Diversity In An Old-Growth Tropical Forest, Xiankai Lu, Jiangming Mo, Frank S. Gilliam, Guoyi Zhou, Yunting Fang
Biological Sciences Faculty Research
Response of plant biodiversity to increased availability of nitrogen (N) has been investigated in temperate and boreal forests, which are typically N-limited, but little is known in tropical forests. We examined the effects of artificial N additions on plant diversity (species richness, density and cover) of the understory layer in an N saturated old-growth tropical forest in southern China to test the following hypothesis: N additions decrease plant diversity in N saturated tropical forests primarily from N-mediated changes in soil properties. Experimental additions of N were administered at the following levels from July 2003 to July 2008: no addition (Control); …
A New Species Of Calceolaria (Calceolariaceae) From Disturbed Paramos In South Ecuador, Pamela Puppo
A New Species Of Calceolaria (Calceolariaceae) From Disturbed Paramos In South Ecuador, Pamela Puppo
Biological Sciences Faculty Research
Calceolaria molaui Puppo, sp. nov. is described and illustrated. The new species was collected in Loja, in disturbed paramos near the frontier with Peru so it would be expected to occur in northern Peru as well. It is characteristic for having hirsute indumentum composed of branched trichomes, ovate, subcoriaceous leaves with reticulate venation, cyme bracts absent, elaiophore absent, and brown, deflexed anthers, totally dehiscent. Due to its indumentum, leave shape, and anther morphology, C. molaui is placed in Section Lehmannina Pennell within subgenus Calceolaria. This is the only species of this section in southern Ecuador.
Spatial Heterogeneity Of Soil Nutrients And Plant Species In Herb-Dominated Communities Of Contrasting Land Use, Frank S. Gilliam, David A. Dick
Spatial Heterogeneity Of Soil Nutrients And Plant Species In Herb-Dominated Communities Of Contrasting Land Use, Frank S. Gilliam, David A. Dick
Biological Sciences Faculty Research
Recent interest in spatial pattern in terrestrial ecosystems has come from an awareness of theintimate relationship between spatial heterogeneity of soil resources and maintenance of plant species diversity. Soil and vegetation can vary spatially inresponse to several state factors of the system. In this study, we examined fine-scale spatial variability of soil nutrients and vascular plant species in contrasting herb-dominated communities (a pasture and an oldfield) to determine degree of spatial dependenceamong soil variables and plant community characteristics within these communities by sampling at 1-m intervals. Each site was divided into 25 1-m 2 plots. Mineral soil was sampled (2-cm …
Global Assessment Of Nitrogen Deposition Effects On Terrestrial Plant Diversity : A Synthesis, R. Bobbink, K. Hicks, J. Galloway, T. Spranger, R. Alkemade, M. Ashmore, M. Bustamante, S. Cinderby, E. Davidson, F. Dentener, B. Emmett, J. W. Erisman, M. Fenn, Frank S. Gilliam, A. Nordin, L. Pardo, W. Devries
Global Assessment Of Nitrogen Deposition Effects On Terrestrial Plant Diversity : A Synthesis, R. Bobbink, K. Hicks, J. Galloway, T. Spranger, R. Alkemade, M. Ashmore, M. Bustamante, S. Cinderby, E. Davidson, F. Dentener, B. Emmett, J. W. Erisman, M. Fenn, Frank S. Gilliam, A. Nordin, L. Pardo, W. Devries
Biological Sciences Faculty Research
Atmospheric nitrogen (N) deposition is a recognized threat to plant diversity in temperate and northern parts of Europe and North America. This paper assesses evidence from field experiments for N deposition effects and thresholds for terrestrial plant diversity protection across a latitudinal range of main categories of ecosystems, from arctic and boreal systems to tropical forests. Current thinking on the mechanisms of N deposition effects on plant diversity, the global distribution of G200 ecoregions, and current and future (2030) estimates of atmospheric N-deposition rates are then used to identify the risks to plant diversity in all major ecosystem types now …