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OALib Journal期刊
ISSN: 2333-9721
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牦牛粪便对川西北高寒草甸土壤养分的影响
DOI: 10.3724/SP.J.1145.2009.00666, PP. 666-671
Keywords: 牦牛粪便,高寒草甸,川西北,土壤养分
Abstract:
川西北高寒草甸是我国四大牧区之一，也是“长江上游生态屏障”建设的重要“生态功能区”之一.近年来牦牛粪便被大量出售，显著地改变了生态系统的养分循环.通过模拟牛粪堆积，研究了牦牛粪便养分释放及其对周围土壤养分（no3--n、nh4+-n、速效k、无机p、有机c、全n和全p）在不同时间和距离条件下的影响.结果表明，在研究区域内，牛粪对草地生态系统具有较强的养分（n、p）贡献能力，据初步统计，其值大致为n素699~932kghm-2，p素为110~147kghm-2；牛粪养分在夏季具有较快的分解速率，在3mo左右之后基本分解殆尽；粪便在短期内能显著提高粪下土壤养分的含量，其中，对no3--n含量的提高最为明显，在2mo左右之后其含量达到初始态的8.4倍，在实验后期，粪便对土壤养分的影响作用逐渐消失；粪便在夏季对周围10cm内土壤的养分（no3--n、nh4+-n、速效k和无机p）含量能产生显著影响（p<0.05），但影响范围难以达到周围30cm左右.与通常结论不同的是，在整个实验周期内，牦牛粪便并没有显著提高土壤有机c、全n和全p的含量.图4表1参31
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