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Abiotic Nitrogen Uptake in Semiarid Grassland Soils of the U.S. Great Plains

^a Environmental Studies Program, 6182 Steele Hall, Dartmouth College, Hanover, NH 03755
^b Desert Research Institute and Environmental and Resource Sciences, Univ. of Nevada, Reno, NV 89512
^c Department of Forest Sciences and the Natural Resource Ecology Laboratory, Colorado State University Fort Collins, CO 80523

View larger version (53K): [in a new window]   Fig. 1. (a) Total soil N, (b) KCl-extractable N-NH+4 content, and (c)15N natural abundance for bulk soils collected from across an environmental gradient in semiarid grasslands of the U.S. Great Plains. Bars with the same letter are not significantly different at P = 0.05. Error bars are one standard error of the mean. Site codes are as follows: TX-1 and TX-2, Muleshoe National Wildlife Refuge, TX; SECO-1 and SECO-2, Comanche National Grasslands, CO; NECO-1 and NECO-2, Pawnee National Grasslands, CO; WY-1 and WY-2, Thunder Basin National Grasslands, WY; MT-1 and MT-2, Fort Keogh Livestock and Range Research Laboratory, MT.

View larger version (53K): [in a new window]   Fig. 2. (a) Total N immobilization in unsterilized soils, (b) biological N immobilization in unsterilized soils (unsterilized -sterilized), and (c) abiotic N immobilization in sterilized soils collected from across a temperature gradient in the US Great Plains. Bars with the same letter are not significantly different at P = 0.05. Error bars are one standard error of the mean.Site codes are as follows: TX-1 and TX-2, Muleshoe National Wildlife Refuge, TX; SECO-1 and SECO-2, Comanche National Grasslands, CO; NECO-1 and NECO-2, Pawnee National Grasslands, CO; WY-1 and WY-2, Thunder Basin National Grasslands, WY; MT-1 and MT-2, Fort Keogh Livestock and Range Research Laboratory, MT.

View larger version (29K): [in a new window]   Fig. 3. Scatter plot and linear regression of (a) total N assimilation and (b) biological N immobilization vs. soil organic C content in soils collected from across a temperature gradient in the US Great Plains. Error bars are one standard error of the mean.

View larger version (24K): [in a new window]   Fig. 4. Proportion of total N assimilation attributed to abiotic uptake (N assimilation in sterilized soils/N assimilation in unsterilized soils) for soils collected across a temperature gradient in the US Great Plains. Error bars are one standard error of the mean.Site codes are as follows: TX-1 and TX-2, Muleshoe National Wildlife Refuge, TX; SECO-1 and SECO-2, Comanche National Grasslands, CO; NECO-1 and NECO-2, Pawnee National Grasslands, CO; WY-1 and WY-2, Thunder Basin National Grasslands, WY; MT-1 and MT-2, Fort Keogh Livestock and Range Research Laboratory, MT.