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高寒灌丛与珠芽蓼草地土壤有机碳的稳定性
引用本文:杜慧平,展争艳,李小刚. 高寒灌丛与珠芽蓼草地土壤有机碳的稳定性[J]. 甘肃农业大学学报, 2007, 42(3): 91-96
作者姓名:杜慧平  展争艳  李小刚
作者单位:甘肃农业大学资源环境学院,甘肃,兰州,730070
基金项目:教育部重点技术研究项目(204140),甘肃省教育厅项目(0502-13)资助.
摘    要:在高山草原带选择了以珠芽蓼为主要群落组成的草地、以金露梅为主要群落组成的灌丛和以柳+金露梅为主要群落组成的灌丛,研究土壤有机碳的生物稳定性.研究结果表明,在0~30 cm土层,金露梅灌丛平均土壤总有机碳含量显著低于珠芽蓼草地,但是与柳+金露梅灌丛之间差异不显著.金露梅灌丛和柳+金露梅灌丛土壤粗有机碳、热水溶性有机碳在土壤总有机碳中的比例以及矿化有机碳与微生物量有机碳的比值显著高于珠芽蓼草地.这些结果说明灌丛土壤有机碳的生物稳定性显著低于草本珠茅蓼草地,意味着在过度放牧、砍伐和开垦等人为干扰下灌丛土壤有机碳将更加容易降低.

关 键 词:高寒灌丛  高寒草地  生物稳定性  土壤有机碳库
文章编号:1003-4315(2007)03-0091-06
修稿时间:2006-11-27

Differences in biological stability of soil organic carbon pools between shrub and Polygonum viviparum grassland at alpine site
DU Hui-ping,ZHAN Zheng-yan,LI Xiao-gang. Differences in biological stability of soil organic carbon pools between shrub and Polygonum viviparum grassland at alpine site[J]. Journal of Gansu Agricultural University, 2007, 42(3): 91-96
Authors:DU Hui-ping  ZHAN Zheng-yan  LI Xiao-gang
Affiliation:College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou 730070 ,China
Abstract:Polygonum viviparum grassland,Dasiphora fruticosa shrub and Salix cupulalis plus Dasiphora fruticosa shrub were selected to examine the differences in the bio-stability of soil organic carbon at an alpine site in the Eastern Qilian mountains.The results showed that in depth 0~30 cm,total soil organic carbon concentration was averagely significantly lower under Dasiphora fruticosa than under Polygonum viviparum,but it was identical under Dasiphora fruticosa and under Salix cupulalis plus Dasiphora fruticosa.The proportions of coarse organic carbon and hot-water extracted carbohydrate carbon in total soil organic carbon,and the ratio of mineralized-carbon to microbial biomass carbon were significantly higher in soils under the two shrub fruticetas,i.e.,Dasiphora fruticosa and Salix cupulalis plus Dasiphora fruticosa,than under herbosa,i.e.,Polygonum viviparum.These results might mean that the biological stability of soil organic carbon in shrub were lower than that in herbosa pasturelands,and that soil organic carbon level in shrub soils were more easily prone to recede than in herbosa pastureland soils in case pasturelands be exposed to unsustainable management.
Keywords:alpine shrub  alpine grassland  biological stability  soil organic carbon pools
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