Filters: Tags: net primary productivity (X) > Types: Citation (X)
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A principal challenge in ecology is to integrate physiological function (e.g. photosynthesis) across a collection of individuals (e.g. plants of different species) to understand the functioning of the entire ensemble (e.g. primary productivity). The control that organism size exerts over physiological and ecological function suggests that allometry could be a powerful tool for scaling ecological processes across levels of organization. Here we use individual plant allometries to predict how nutrient content and productivity scale with total plant biomass (phytomass) in whole plant communities. As predicted by our model, net primary productivity as well as whole community nitrogen and phosphorus content all scale...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Community size distribution,
Ecology Letters,
biomass,
ecological stoichiometry,
functional diversity,
Field measurements, daily meteorological inputs, and previously validated iSnobal simulations were used to run and inform the biogeochemical models Biome-BGC and Biome-BGC MuSo at three aspen stands in the Reynolds Creek Experimental Watershed. iSnobal simulations of snow redistribution were used to modify measured precipitation values to account for the redistribution of snow. Biome-BGC simulations were run under historical conditions (1984-2015) assuming both a uniform and redistributed snow layer. Biome-BGC MuSo simulations were run under historical (1996-2015) and future climate scenarios (2046-2065) and account for the redistribution of snow. Biogeochemical simulation data sets include input files used to run...
We investigated the relationship between plant nitrogen limitation and water availability in dryland ecosystems. We tested the hypothesis that at lower levels of annual precipitation, aboveground net primary productivity (ANPP) is limited primarily by water whereas at higher levels of precipitation, it is limited primarily by nitrogen. Using a literature survey of fertilization experiments in arid, semi-arid, and subhumid ecosystems, we investigated the response of ANPP to nitrogen addition as a function of variation in precipitation across geographic gradients, as well as across year-to-year variation in precipitation within sites. We used four different indices to assess the degree of N limitation: (1) Absolute...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Arid,
Biogeochemistry,
Fertilization,
Kluwer Academic Publishers,
Net primary productivity,
The Chihuahuan desert of New Mexico, USA, has changed in historical times from semiarid grassland to desert shrublands dominated by Larrea tridentata and Prosopis glandulosa. Similar displacement of perennial grasslands by shrubs typifies desertification in many regions. Such structural vegetation change could alter average values of net primary productivity, as well as spatial and temporal patterns of production. We investigated patterns of aboveground plant biomass and net primary production in five ecosystem types of the Jornada Basin Long-Term Ecological Research (LTER) site. Comparisons of shrub-dominated desertified systems and remnant grass-dominated systems allowed us to test the prediction that shrublands...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Chihuahuan desert,
Global Change Biology,
Jornada LTER,
Larrea tridentata,
Prosopis glandulosa,
This product consists of 29 datasets of tabular data and associated metadata for watershed characteristics of 1,530 study sites of the Surface Water Trends (SWT) project of the U.S. Geological Survey’s (USGS) National Water Quality Program (NWQP). The project is conducting national studies of trends in water quality of streams and rivers for periods ranging from 10 to 40 years, between 1972 and 2012. The data here include both static and time-series characteristics. Static data include primarily physical characteristics which have changed little over this period, such as geology, soils, and topography. Time-series data represent characteristics which may or may not have changed over time, such as land use, agricultural...
Categories: Data;
Types: Citation;
Tags: Atmospheric Deposition,
Basin Morphology,
Census of Agriculture,
Conterminous US,
Crop Practices,
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