Pedosphere 17(6): 776--785, 2007
ISSN 1002-0160/CN 32-1315/P
©2007 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Storage, patterns and controls of soil nitrogen in China |
YANG Yuan-He1 , MA Wen-Hong2, A. MOHAMMAT1 and FANG Jing-Yun1 |
1 Department of Ecology, and Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing 100871 (China). E-mail: yhyang@water.pku.edu.cn
2 School of Environment and Urban Study, Peking University Shenzhen Graduate School, Shenzhen 518055 (China) |
| ABSTRACT |
| Soil holds the largest nitrogen (N) pool in terrestrial ecosystems, but estimates of soil N stock remain controversial. Storage and spatial distribution of soil N in China were estimated and the relationships between soil N density and environmental factors were explored using data from China's Second National Soil Survey and field investigation in northwest China and the Tibetan Plateau. China's soil N storage at a depth of one meter was estimated at 7.4 Pg, with an average density of 0.84 kg m-2. Soil N density appeared to be high in southwest and northeast China and low in the middle areas of the country. Soil N density increased from the arid to semi-arid zone in northern China, and decreased from cold-temperate to tropical zone in the eastern part of the country. An analysis of general linear model suggested that climate and vegetation determined the spatial pattern of soil N density for natural vegetation, which explained 75.4% of the total variance. |
| Key Words: Climate, soil nitrogen, soil texture, spatial distribution, vegetation |
| Citation: Yang, Y. H., Ma, W. H., Mohammat, A. and Fang, J. Y. 2007. Storage, patterns and controls of soil nitrogen in China. Pedosphere. 17(6): 776-785. |
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