西藏安多草地退化对植物生物量和土壤养分的影响 |
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引用本文: | 李亚娟,曹广民,龙瑞军. 西藏安多草地退化对植物生物量和土壤养分的影响[J]. 草原与草坪, 2015, 0(4): 32-36. DOI: 10.3969/j.issn.1009-5500.2015.04.007 |
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作者姓名: | 李亚娟 曹广民 龙瑞军 |
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作者单位: | 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 |
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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。
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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 |
Effect of grassland degradation on the plant biomass and soil nutrients in Anduo County,Tibetan |
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Abstract: | 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 a-bove ground biomass,root biomass and soil organic carbon,total N,total P,available N and available P were de-termined.The results showed that the above ground,root and total biomass all decreased significantly,and the a-bove ground biomass,0~10 cm,10~20 cm 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 0~10 cm and 10~20 cm soil depth both increased significantly,but the available N and available P in 0~10 cm and 10~20 cm soil depth both decreased significantly after degradation.In addition to total N in the degraded grassland,there were no significant differ-ence in soil organic carbon,total N,total P,available N and available P of different soil depth both the two grass-land types. |
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Keywords: | Kobresia pygmaea meadow steppe degraded meadow biomass soil total nutrients soil available nutrients |
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