青海省祁连县高寒草甸草原土壤有机碳分布特征  

Distribution characteristics of soil organic carbon in northern slope of alpine meadow steppe in Qilian mountains in Qilian County,Qinghai Province

作　　者：李硕[1] 姜哲浩[1] 张德罡[1] 聂中南 陈建纲[1] 胡新振[1] 陈璐[1] 袁子茹[1] 任灵[1] 

机构地区：[1]甘肃农业大学草业学院,甘肃兰州730070

出　　处：《草业科学》2016年第8期1469-1475,共7页Pratacultural Science

基　　金：农业部农业生态与资源保护总站"祁连山黑河流域草原固碳和应对气候变化"

摘　　要：为了评价青海省祁连县高寒草甸草原有机碳的分布特征,本研究以祁连县海拔2 963-3 392m范围内高寒草甸草原为研究对象,采用野外调查取样结合室内分析的方法,分析了祁连县高寒草甸草原0-50cm土层土壤有机碳的分布规律。结果表明,土壤有机碳含量随着土层深度的增加而显著减少(P<0.01),表现为0-10>10-20>20-30>30-40>40-50cm;土壤有机碳密度和土壤有机碳储量同土壤有机碳含量分布有相同的趋势;土壤有机碳与地上生物量和植被盖度呈极显著(P<0.01)正相关关系,表明土壤有机碳含量随着盖度和地上生物量的增加而增加。土壤有机碳含量与土壤容重呈极显著(P<0.01)负相关关系;相反,随着土层深度的增加,土壤含水量逐渐减少,土壤有机碳含量与土壤含水量呈极显著(P<0.01)正相关。In order to evaluate the distribution characteristics of soil organic carbon （SOC） in the alpine meadow and steppe of Qilian county, the combined methods of field sampling and laboratory analysis were employed to analyze the variation of SOC in alpine meadow and steppe of Qilian county in altitude between 2 963 and 3 392 m. The results showed that there was very significant difference （P（0.01） between the contents of SOC in dif- ferent soil depths （0-10, 10-20, 20-30, 30-40 and 40-50 cm） which decreased with increasing soil depth. The density of SOC had same variations with the contents of SOC which also very significantly decreased with increasing soil depth. SOC had significant positive linear relationships （P〈0.01） with both herbage production and vegetation coverage. The content of SOC increased with increasing of herbage production and vegetation coverage. There was significant negative linear relationship （P〈0.01） between SOC and soil bulk density. Soil moisture decreased with increasing soil depth, therefore, the contents of SOC had significant positive linear relationships （P〈0.01） with soil moisture.

关 键 词：祁连县 高寒草甸草原 土壤有机碳 分布特征 相关性分析 

分 类 号：S812.2[农业科学—草业科学]