东祁连山不同退化程度高寒草甸土壤养分特征研究  

Soil nutrient characteristics of alpine meadow at different degradation degrees in Eastern Qilian Mountains

作　　者：张生楹[1] 张德罡[1] 柳小妮[1] 陈建纲[1] 徐长林[1] 段春华[1] 

机构地区：[1]甘肃农业大学草业学院 草业生态系统教育部重点实验室中.美草地畜牧业可持续研究中心,甘肃兰州730070

出　　处：《草业科学》2012年第7期1028-1032,共5页Pratacultural Science

基　　金：国家自然基金草地综合顺序分类系统与中国草地NPP的研究(30960264)

摘　　要：研究了东祁连山不同退化程度的高寒草甸草地土壤养分特征,结果表明,随着退化加剧,高寒草甸草地的土壤pH值逐渐增加;全氮、全磷、速效锰和速效铁含量逐渐减少;有机质、速效锌、速效氮和速效磷含量先降低后增加,有机质含量以重度退化草地最低,速效锌、速效氮和速效磷含量以中度退化草地最低;全钾和速效铜含量并未因草地退化而改变,且极度退化草地土壤有机质和全氮含量在20～30cm土层反而高于表层。总体上,随土层加深土壤中有机质、全氮、全磷、速效氮、速效钾、速效磷和速效锌含量下降,速效铁、速效铜和速效锰则增加。The soil nutrients of alpine meadow at different degradation degrees in the eastern region of Qilian Mountains were reported in this study. The results of this study indicated that the contents of soil total nitrogen, total phosphorus, available manganese and iron decreased along with the degradation, and meanwhile, the pH value increased. The organic matter, available zinc, nitrogen and phosphorus content decreased firstly and then increased, and the organic matter content were the lowest at severe degradation degrees, and the available zinc, nitrogen and phosphorus content were the lowest at moderate degradation degree, and the total potassium and available copper content were similar among different degradation degrees. The content of organic matter and total nitrogen at 20--30 cm layer was higher that at surface soil layer at extreme degradation degree. On the whole the soil organic matter, total nitrogen, total phosphor- us, available nitrogen, phosphorus and potassium, available phosphorus and phosphorus zinc declined and available iron, copper and manganese increased as the soil depth increased.

关 键 词：高寒草甸草地 土壤养分 东祁连山 退化程度 

分 类 号：S812.2[农业科学—草业科学]