放牧干扰对岷江上游山地森林/干旱河谷交错带土壤活性有机碳的影响  

Effects of grazing disturbance on soil active organic carbon in mountain forest-arid valley ecotone in the upper reaches of Minjiang River

作　　者：刘珊珊[1] 张兴华[1] 宫渊波[1] 李渊[1] 王燕[1] 尹艳杰 马金松[1] 郭挺[1] 

机构地区：[1]四川农业大学长江上游林业生态工程四川省重点实验室,四川雅安625014

出　　处：《应用生态学报》2014年第2期359-366,共8页Chinese Journal of Applied Ecology

基　　金："十一五"国家科技支撑计划重大项目(2006BAC01A11-4);"十二五"国家科技支撑计划重大项目(2011BAC09B05);四川农业大学创新团队项目资助

摘　　要：研究放牧干扰对岷江上游山地森林-干旱河谷交错带人工刺槐林、人工杨柳林、锥花小檗灌丛和草地4种植被类型土壤有机碳含量和活性组分的影响。结果表明：各放牧强度下,0-10cm土层土壤有机碳及其活性组分含量大于10-20cm土层。随放牧强度的增加,人工刺槐林表层（0-10cm）土壤总有机碳（TOC）、轻组有机碳（LFOC）、颗粒有机碳（POC）和易氧化碳（LOC）含量呈逐渐降低趋势;人工杨柳林表层土壤LFOC含量呈降低趋势,POC含量呈升高趋势,TOC和LOC含量先降低再升高;锥花小檗灌丛土壤POC含量呈降低趋势,TOC、LFOC和LOC含量先降低再升高;草地土壤TOC和POC含量呈降低趋势,LFOC和LOC含量先降低再升高。4种植被类型土壤LOC、LFOC和POC含量随放牧强度增加而下降的幅度是TOC含量的1.1～8.9倍。土壤TOC含量与LOC、LFOC和POC含量呈显著正相关,表明活性有机碳组分能够反映土壤总碳的变化情况。Effects of grazing disturbance on the soil carbon contents and active components in the four vegetations, i.e., artificial Robinia pseudoacacia plantation, artificial poplar plantation, Berberis aggregate shrubland and grassland, were studied in the mountain forestarid valley ecotone in the upper Minjiang River. Soil organic carbon and active component contents in 0-10 cm soil layer were greater than in 10-20 cm soil layer at each level of grazing disturbance. With increasing the grazing intensity, the total organic carbon （TOC）, light fraction organic carbon （LFOC）, particulate organic carbon （POC） and easily oxidized carbon （LOC） contents in 0-10 cm soil layer decreased gradually in the artificial R. pseudoacacia plantation. The LFOC content decreased, the POC content increased, and the TOC and LOC contents decreased initially and then increased with increasing the grazing intensity in the artificial poplar plantation. The POC content decreased, and the TOC, LFOC and LOC contents decreased initially and then increased with increasing the grazing intensity in the B. aggregate shrubland. The POC and TOC contents decreased, and the LFOC and LOC contents decreased initially and then increased with increasing the grazing intensity in the grassland. The decreasing ranges of LOC, LFOC and POC contents were 0.1-7.9 times more than that of TOC content. There were significant positive relationships between TOC and LOC, LFOC and POC, suggesting that the active organic carbon components could reflect the change of soil total carbon content.

关 键 词：生态交错带 放牧干扰 土壤活性有机碳 

分 类 号：S714.2[农业科学—林学]