祁连山中部土壤颗粒组分有机质碳含量及其与海拔和植被的关系  

The soil particulate organic carbon in different elevation and its relationship with vegetation in Qilian Mountain

作　　者：吴建国[1] 艾丽[1,2] 田自强[1] 常学向[3] 

机构地区：[1]中国环境科学研究院,北京100012 [2]广州市环境保护科学研究院,广东广州510620 [3]中国科学院寒区旱区环境与工程研究所,甘肃兰州734000

出　　处：《生态环境》2008年第6期2358-2365,共8页Ecology and Environmnet

基　　金：国家自然科学基金项目(40543014)

摘　　要：调查分析了祁连山中段不同海拔土壤颗粒有机碳及其与植被的关系。结果显示,土壤颗粒组分比例在0~15cm和15~35cm土层随海拔升高而呈现下降趋势(P>0.2);土壤颗粒有机碳比例在0~15cm土层随海拔升高也呈现下降趋势(P≤0.001)。土壤颗粒组分比例0~15cm土层在阴坡3000m^3500m、15~35cm土层在阴坡3200m和3500m及半阴坡2200和2800m处较高;土壤颗粒有机碳比例0~15cm土层在阴坡3000m和3200m、半阴坡2200m和2800m,以及15~35cm土层在阴坡3200m和3500m、阳坡3300m和3500m处较高(P<0.05)。土壤颗粒有机碳和颗粒组分碳含量随海拔升高变化不显著(P<0.9)。土壤颗粒有机碳含量0~15cm土层在阴坡3000m^3500m、15~35cm土层在阴坡3000m^3500m及阳坡3300m处较高;土壤颗粒组分碳含量0~15cm土层在阴坡3000m^3400m和阳坡3300m,以及15~35cm土层在阴坡3200m和3400m及阳坡3300m处较高。土壤颗粒组分比例0~15cm土层在森林和灌丛草甸中较高;15~35cm土层在森林、灌丛草甸和干旱草原中较高(P<0.05)。土壤颗粒有机碳比例0~15cm土层在荒漠草原和干旱草原,以及15~30cm土层在森林和灌丛草甸中较高(P<0.05)。土壤颗粒组分碳含量0~15cm和15~35cm土层在森林和灌丛草甸中较高(P<0.05)。土壤颗粒有机碳含量0~15cm和15~35cm土层在森林中最高(P<0.05)。土壤颗粒组分碳含量和颗粒有机碳含量与土壤有机碳含量有显著的正相关性(P<0.001),土壤颗粒有机碳含量与颗粒组分碳含量也有显著的正相关性(P<0.001),土壤颗粒组分比例与有机碳含量相关性不显著(P=0.15),土壤颗粒有机碳含量与颗粒组分比例有显著正相关性(P<0.005)。结果说明祁连山中部北坡土壤有机碳稳定性受植被和海拔共同影响,荒漠草原和干旱草原表层土壤有机碳稳定性较低,森林和灌丛草甸土壤中非保护性碳含量较高。The soil particulate organic matter-carbon （POC） is the unprotected pool of soil organic carbon （SOC） and it would indicate the stabilization of SOC. The Qilian mountain located the northern border of Qinghai-Tibet plateau with different vegetation and soil type, the SOC under these vegetations would be changed with change in climate or human being activities, and the SOC with different stabilization would be changed differently by the disturbance. To know the different stabilization of SOC under different altitude and vegetation of this mountain for understanding the impacts of climate change on the alpine ecosystem carbon sink, the POC in different elevation and its relationship with vegetation in Qi Lian Mountain was investigated. The results showed that the ratio of soil particulate fraction decreased with increasing elevation in 0-15 cm and 15-35 cm soil depth（P〉0.2）, and the ratio of POC in 0-15 cm soil depth decreased with increasing elevation（P≤ 0.001）, while it increased with increasing elevation in 15-30 cm soil depth（P〉0.5）. Soil particulate fraction in 0-15 cm soil depth under 3 000 m-3 500 m of shady slope or which in 15-35 cm soil depth under 3 200 m or 3 500 m of shady slope or 2 200 m-2 800 m was the highest among different altitudes（P〈0.05）, and the ratio of POC in 0-15 cm soil depth under 3 000 m and 3 200 m of shady slope or 2 200 m and 2 800 m, or that in 15-35 cm soil depth under 3 200 m and 3 500 m of shady slope or 3 300 m and 3 500 m of sunny slope was also the highest under different altitudes（P〈0.05）. The POC and the carbon content of soil particulate fraction both did not significantly increase with increasing altitudes （P〈0.9）. The difference of the carbon content of soil particulate fraction between 0-15 cm and 15-35 cm soil depth under different altitudes except 2 200m -2 800 m or 3 000 m of shady slope or 3 600 m of sunny slope was not significant （P〈0.05）. The content of POC in 0-15 cm under 3 000 m-3 500 m of shady slope or that i

关 键 词：土壤有机碳 颗粒有机碳 祁连山 

分 类 号：S153.61[农业科学—土壤学]