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Carbon and nitrogen storage in plant and soil as related to nitrogen and water amendment in a temperate steppe of northern China

作　　者：Fu-Mei Lü, Xiao-Tao Lü, Wei Liu, Xu Han, Guang-Ming Zhang, De-Liang Kong, Xing-Guo Han
影响因子：2.156
刊物名称：Biology and Fertility of Soils
出版年份：2011
卷：47  期：2  页码：187-196

论文摘要：

   We conducted a field-manipulated experiment to assess whether changes in precipitation and nitrogen (N) deposition alter ecosystem carbon (C) and N storage. Both C and N pools of plant and soil were monitored when urea-N (17.5 g N m−2) and water (increasing mean annual precipitation by 50%) were added to a temperate steppe. After 2 years of treatments, both N and water addition significantly increased soil inorganic N availability by 125% and 62% during the growing season. While water addition significantly increased ecosystem C storage by 6% and N storage by 8%, N addition showed significant effects on neither of them. There were no interactions between N and water addition to affect both total C and N storage in this ecosystem, though they did interact to affect several individual pools (e.g., aboveground biomass N pool, litter C, and N pool). Results from the present study indicate that water availability is more important than N availability for C sequestration and that increasing precipitation will favor C sequestration in this semi-arid grassland.
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