期刊
BIOGEOCHEMISTRY
卷 98, 期 1-3, 页码 185-193出版社
SPRINGER
DOI: 10.1007/s10533-009-9385-x
关键词
Carbon partitioning; Carbon pool; Keerqin Sandy Lands; Nitrogen limitation; Sandy grassland; Species composition
资金
- National Key Basic Research Program of China [2007CB106803]
- National Key Technologies R&D Program of China [2006BAD26B0201-1, 2006BAC01A12]
- National Natural Science Foundation of China [30800143]
To clarify responses of plant and soil carbon (C) and nitrogen (N) pools in grassland ecosystem to N addition, a field experiment was performed in a grassland in Keerqin Sandy Lands, Northeast China. We investigated vegetation composition and C and N pools of plant and soil (0-30 cm) after five consecutive years of N addition at a rate of 20 g N m(-2) y(-1). Vegetation composition and species diversity responded dramatically to N addition, as dominance by C(4) perennials was replaced with C(3) annuals. Carbon in aboveground pool increased significantly (over two-fold), mainly due to the increase of the C in aboveground living plants and surface litter, which increased by 98 and 134%, respectively. Although soil C did not change significantly, the root C pool decreased in response to 5 years of N addition. The total ecosystem C pool was not significantly impacted by N addition because the large soil pool did not respond to N addition, and the increase in aboveground C was offset by the decrease in root C pool. Moreover, N addition significantly increased the aboveground N pool, but had no significant effects on belowground and total ecosystem N pools. Our results suggest that in the mid-term N addition alters the C and N partitioning in above- and belowground pools, but has no significant effects on total ecosystem C and N pools in these N-limited grasslands.
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