退化高寒草地浅层土壤理化性质Meta分析

青藏高原生态地位显著，草地退化影响区域生态安全，针对退化高寒草地土壤理化性质的研究众多但结果存在较大异质性。通过检索纳入79篇与退化高寒草地土壤理化性质相关的文献，采用整合分析方法用于定量述评不同退化程度高寒草地浅层土壤主要理化性质的效应及变化规律。结果表明：高寒草甸0～10 cm、10～20 cm土层内随着退化加剧土壤容重、pH上升，土壤含水量、有机碳、全氮、全磷、全钾、速效氮、速效磷、速效钾下降；高寒草原0～10 cm、10～20 cm土层内随退化加剧，土壤容重上升，pH、含水量、有机碳、速效钾下降。总体反映出不同退化程度对高寒草地土壤主要理化性质产生较大负面影响，研究结果可为青藏高原高寒草地生态保护提供依据。

Meta-analysis of Physical and Chemical Properties of Shallow Soils in Degraded Alpine Grasslands

The ecological status of the Qinghai-Tibet Plateau is significant,and the degradation of grasslands affects regional ecological security. There are many studies on the physicochemical properties of degraded alpine grassland soils,but the results are highly heterogeneous. We searched 79 papers related to the physicochemical properties of degraded alpine grassland soils and used Meta-analysis to quantitatively assess the effects and changes in the main physicochemical properties of shallow alpine grassland soils with different degrees of degradation. The results showed that:(1) In the 0~10 cm and 10~20 cm soil layer of alpine meadow,soil bulk density and pH increased,while soil water content,organic carbon,total N,total P,total K,available N,available P and available K decreased;(2) In the 0~10 cm and 10~20 cm soil layers of the alpine steppe,soil bulk density increased,while pH,water content,organic carbon and available P decreased. The results showed that different degradation levels had a negative impact on the main physical and chemical properties of soil in alpine grassland. The results could provide a basis for ecological protection of alpine grassland in Qinghai-Tibet Plateau.