氮、磷养分添加对高寒草甸土壤酶活性的影响

发布时间：2018-03-29 01:16

本文选题：青藏高原高寒草甸　切入点：土壤酶活性　出处：《草业学报》2016年02期

【摘要】：本试验以典型的青藏高原高寒矮嵩草草甸(Kobresia humilis meadow)为研究平台,以表征土壤碳、氮、磷、硫养分循环的6种土壤酶为研究对象,研究土壤酶以及土壤速效养分在4年氮、磷养分添加的累积效应下的变化规律,分析和评价氮、磷养分添加对土壤养分循环方面的影响。试验结果为:氮、磷养分添加改变了土壤中速效养分的含量;氮添加与0~10cm土层中的碱性磷酸酶活性有正效应,磷添加抑制了0~10cm土层中的碱性磷酸酶活性;氮、磷养分添加均抑制了0~10cm土层中的脲酶活性;氮添加抑制了2个土层中的纤维素酶活性;芳基硫酸酯酶活性和蔗糖酶活性没有表现出显著差异性;10~20cm土层中的几丁质酶活性在氮、磷养分添加处理下均增强,其中磷添加对几丁质酶活性的增幅最显著。结果表明:外源添加的氮在调控磷的矿化方面有促进作用,磷的添加对氮素的释放也有一定的作用;青藏高原高寒草甸受磷限制的程度可能更大。
[Abstract]:This experiment took Kobresia humilis meadow, a typical alpine Kobresia humilis meadowow, as the research platform, studied six kinds of soil enzymes which characterized the cycling of soil carbon, nitrogen, phosphorus and sulfur, and studied soil enzymes and available nutrients in 4 years. The effects of N and P on soil nutrient cycling were analyzed and evaluated. The results were as follows: the addition of N and P changed the content of available nutrients in soil. The addition of nitrogen and phosphorus inhibited the alkaline phosphatase activity in 0~10cm soil layer, and the addition of nitrogen and phosphorus nutrients inhibited the urease activity in 0~10cm soil layer. Nitrogen supplementation inhibited cellulase activity in two soil layers, aryl sulfate enzyme activity and sucrase activity did not show significant difference in 1020cm soil layer. The results showed that the addition of exogenous nitrogen promoted the mineralization of phosphorus, and the addition of phosphorus also played a role in nitrogen release. Alpine meadows on the Qinghai-Tibet Plateau may be more restricted by phosphorus.
【作者单位】：中国科学院西北高原生物研究所;中国科学院大学;
【基金】：国家973自然科学基金项目(2014CB954002) 青海省科技促进新农村计划项目(2013-N-540)资助
【分类号】：S812.2

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