西藏安多草地退化对植物生物量和土壤养分的影响  

Effect of grassland degradation on the plant biomass and soil nutrients in Anduo County,Tibetan

作　　者：李亚娟[1] 曹广民[2] 龙瑞军[3] 

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/甘肃省草业工程实验室/中-美草地畜牧业可持续发展研究中心,甘肃兰州730070 [2]中国科学院西北高原生物研究所,青海西宁810008 [3]兰州大学草地农业科技学院,甘肃兰州730020

出　　处：《草原与草坪》2015年第4期32-36,共5页Grassland and Turf

基　　金：国家自然科学基金项目(30970520)资助

摘　　要：以西藏安多县原生小嵩草（Kobresia pygmaea）草甸草原与退化小嵩草草甸草原2种类型草地为研究对象,对其草地的地上和地下生物量、土壤的有机碳、全氮、全磷、有效氮和有效磷含量进行研究,了解退化对草地植物生物量和基本养分含量的影响。结果表明,退化小嵩草草甸草原的地上、地下以及总生物量均显著下降,地上0~10、10~20cm土层生物量和总生物量分别相当于小嵩草草甸草的80.9%、22.1%,15.8%和20.0%;2种类型草地土壤的全量和有效碳氮磷含量均较低,退化对土壤全量和有效养分的影响并不一致,退化导致0~10和10~20cm土层的有机碳、全氮和全磷含量均显著升高,而导致0~10和10~20cm土层的有效氮和有效磷含量均显著降低,2种类型草地随着土层的加深,土壤有机碳、全氮、全磷、有效氮和有效磷含量没有明显差异。Two types grassland,Kobresia pygmaea meadow steppe and degraded Kobresia pygmaea meadow steppe were selected to study the effect of alpine meadow degradation on biomass and soil nutrients,and the above ground biomass,root biomass and soil organic carbon,total N,total P,available N and available P were determined.The results showed that the above ground,root and total biomass all decreased significantly,and the above ground biomass,0~10cm,10~20cm and total biomass of the degraded grassland were 80.9%,22.1%,15.8% and 20.0% of the Kobresia pygmaea meadow steppe respectively.The total and available nutrients of the two grassland types were all at a lower level.The effects of degradation on soil total nutrients and available nutrients were not consistent.Soil organic carbon,total N and total P in 0~10cm and 10~20cm soil depth both increased significantly,but the available N and available P in 0~10cm and 10~20cm soil depth both decreased significantly after degradation.In addition to total N in the degraded grassland,there were no significant difference in soil organic carbon,total N,total P,available N and available P of different soil depth both the two grassland types,

关 键 词：小嵩草草甸草原 退化草地 生物量 土壤全量养分 土壤有效养分 

分 类 号：S812[农业科学—草业科学]