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《Acta Ecologica Sinica》 2004-11
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The effects of temperature and moisture on the soil net nitrogen mineralization in an Aneulolepidium chinensis grassland,Inner Mongolia,China

WANG Chang-Hui,XING Xue-Rong~*,HAN Xing-Guo~* (Laboratory of Quantitative Vegetation Ecology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China)  
Net nitrogen (N) mineralization determines soil N availability, which limits plant growth and productivity. A better understanding of the effects of temperature and moisture on soil N mineralization will facilitate the prediction of soil N cycling and primary productivity in grasslands. The objective of this study was to evaluate the effects of temperature (T) and soil moisture (M) on N mineralization in a typical steppe ecosystem in Inner Mongolia, China. Soil cores were kept in PVC tubes and adjusted to different soil water contents, and then incubated at different temperatures for 7, 14, 21 and 35 d. The results showed that the accumulation quantity and rate of soil net N mineralization were significantly related to the temperature effects (p0.001). At lower temperatures (-10℃、0℃、5℃), the net N mineralization rate was not statistically different irrespective of the incubation periods. However, net N mineralization rate increased with temperature at higher temperature(15℃,25℃,and 35℃). Soil moisture also significantly affected net N mineralization. Among the three moisture contents (0.15kg/kg, 0.25kg/kg, 0.35kg/kg), the net N mineralization rate was the highest at the moisture content of 0.25kg/kg. The rate of net N mineralization showed a high variability under different incubation periods (1, 2, 3, 5 weeks). Soil incubated for 1 week had the highest mineralization rate whereas N mineralization accumulation quantity was largest at 3-weeks. When temperature was 35℃ and moisture was 0.25kg/kg, the accumulation of soil nitrogen mineralization was the highest during 21d incubation. With incubation time prolonged, the N mineralization accumulation increased, but the rate of net N mineralization decreased. These results suggested interactive effects of temperature, moisture and incubation time on the quantity and the rate of net N mineralization.
【Fund】: 国家基金委基金重点资助项目 ( 0 3 3 0 15 0 ) ;; 国家科技攻关计划资助项目 ( 2 0 0 2 BA517A11-7) ;; 中国科学院知识创新工程重要方向性资助项目 ( KZCX2 -4 13和 KSCX2 -SW-12 0 )~~
【CateGory Index】: S812.2
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