祁连山中段大野口流域不同植被土壤有机碳和理化性质变化特征研究  

Study on Variation Characteristics of Soil Organic Carbon and Physical and Chemical Properties of Different Vegetation in Dayekou Watershed in the Middle Part of Qilian Mountains

作　　者：樊选 Fan Xuan(Dongdashan Nature Conservation Station,Management Center of Gansu Qilian Mountain National Nature Reserve,Zhangye 734000,China)

机构地区：[1]甘肃祁连山国家级自然保护区管护中心东大山自然保护站,甘肃张掖734000

出　　处：《防护林科技》2023年第3期7-10,共4页Protection Forest Science and Technology

基　　金：国家自然科学基金重点支持项目“黑河流域生态水分样带调查”(91025002/D010106)。

摘　　要：为了加大对祁连山生态系统保护力度,在祁连山中段大野口流域进行了4种植被土壤有机碳和理化性质变化特性的研究。结果表明:4种植被土壤剖面0~40 cm土层有机碳含量、总孔隙度、水稳性团聚体和CEC均值排序为亚高山草甸植被>山地森林草原植被>山地草原植被>山地荒漠植被,容重和pH均值排序为山地荒漠植被>山地草原植被>山地森林草原植被>亚高山草甸植被。亚高山草甸植被比其他植被更有利于提高土壤有机碳含量、总孔隙度、水稳性团聚体和CEC,与山地森林草原植被、山地草原植被和山地荒漠植被比较,0~40 cm土层有机碳均值分别提高了1.16、5.50和7.43倍,总孔隙度均值分别增大了2.86%、7.46%和8.27%;水稳性团聚体均值分别增加了8.32%、15.38%和24.41%;CEC均值分别增加了4.58%、19.71%和44.72%。山地荒漠植被比其他植被更有利于提高土壤容重和pH,与山地草原植被、山地森林草原植被和亚高山草甸植被比较,0~40 cm土层容重均值分别增大了0.76%、5.60%和9.09%,pH均值分别增大了1.39%、1.91%和2.56%。祁连山中段大野口流域的亚高山草甸植被比其他植被更有利于降低土壤容重和pH值。In order to strengthen the protection of ecosystem in the Qilian Mountains,the organic carbon and physical and chemical properties of four planted covers were studied in Dayekou Watershed in the middle part of Qilian Mountains.The results showed as follows:the organic carbon content,total porosity,water stability aggregates and the mean values of CEC in the 0-40 cm soil layer of the four planted covers were ranked in the order of subalpine meadow vegetation>mountain forest steppe vegetation>mountain steppe vegetation>mountain desert vegetation;the order of bulk density and pH values was mountain desert vegetation>mountain steppe vegetation>mountain forest steppe vegetation>subalpine meadow vegetation.Subalpine meadow vegetation was more beneficial to the increase of soil organic carbon content,total porosity,water stable aggregates and CEC than other vegetation.Compared with mountain forest steppe vegetation,mountain steppe vegetation and mountain desert vegetation,the mean value of organic carbon in 0-40cm soil layer was increased by 1.16,5.50 and 7.43 times,respectively,the mean value of total porosity increased by 2.86%,7.46% and 8.27%,respectively,the mean values of water-stable aggregates increased by 8.32%,15.38% and 24.41%,respectively,and the mean value of CEC increased by 4.58%,19.71% and 44.72%,respectively.Compared with mountain steppe vegetation,mountain forest steppe vegetation and subalpine meadow vegetation,mountain desert vegetation was more conducive to improving soil bulk density and pH than other vegetation.In the 0-40 cm soil layer,the mean value of bulk density increased by 0.76%,5.60% and 9.09%,respectively,and the mean value of pH increased by 1.39%,1.91% and 2.56%,respectively.Subalpine meadow vegetation in Dayekou Watershed in the middle part of Qilian Mountains was more beneficial than other vegetation to the reduction of soil bulk density and pH value.

关 键 词：祁连山 大野口 植被 有机碳 理化性质 变化特征 

分 类 号：S714.2[农业科学—林学]