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OALib Journal期刊
ISSN: 2333-9721
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季节性雪被对青藏高原东缘高寒草甸土壤氮矿化的影响
DOI: 10.3724/SP.J.1145.2011.00453, PP. 453-460
Keywords: 季节性雪被,土壤氮,氨化作用,硝化作用,矿化作用,高寒草甸,青藏高原
Abstract:
依据自然雪被分布的差异，在青藏高原东缘高寒草甸中设置3条样带（即深雪、中等厚度雪被和浅雪），于2008年的秋冬过渡期，连续监测各样带中的雪被厚度和土壤温度，并采用原位培养法测定每月的土壤氮素氨化、硝化和矿化速率，以研究不同厚度雪被对高寒草甸土壤氮矿化的影响.结果表明，月均土温、每月日最高土温均值分别与雪被厚度极显著相关，二次函数关系拟合较好（r2=0.576，0.685），且根据每月日最高土温均值与雪被厚度的二次函数关系方程可知，25cm厚的雪被可以起到较好的隔绝效果；土壤含水量受雪被厚度和土壤温差两个因素的显著影响.在秋冬过渡期末，浅雪梯度下土壤硝态氮含量显著降低，且雪被下的净氮矿化速率与月均土温、每月日最高土温均值、每月日最低土温均值都分别呈极显著相关，二次函数关系拟合较好（r2=0.589，0.541，0.601）.研究表明，不同厚度的雪被对土壤温度和含水量影响显著，从而显著地影响着土壤氮的矿化，深雪更有利于氨化、硝化和氮矿化.图7表2参36
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