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草业学报  2015 

围封对青海湖流域高寒草甸植被特征和土壤理化性质的影响

DOI: 10.11686/cyxb2014429, PP. 33-39

Keywords: 围封,高寒草甸,植物群落,土壤理化性质

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Abstract:

以青海湖流域退化的高寒草甸2个草地类型为对象,比较分析了围封2年样地植物群落生物量、群落结构和土壤理化性质的变化。结果表明,1)围封后高山嵩草和矮生嵩草的地上生物量较放牧地分别增加了33.8%和31.5%;且禾本科植物生物量的比例显著增加,杂类草的比例降低。2)功能群多样性指数和均匀度指数显著增加。3)围封2年后,2个草地型0~10cm土层土壤有机碳含量分别增加了10.15%和12.74%,10~30cm土层均无显著变化;矮生嵩草草地0~10cm土层土壤全磷含量增加了16.13%,其余无显著变化;表层土壤容重分别降低了6.61%和6.25%,pH值降低了4.04%和3.69%,10~30cm土层均无显著变化;土壤全磷含量在各土层均无显著变化。

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