长期围栏封育对亚高山草原土壤有机碳空间变异的影响  

Effects of Long-term Enclosure on Spatial Variation of Soil Organic Carbon Content in the Bayanbulak Subalpine Steppe

作　　者：苏建红[1] 朱新萍[1] 王新军[1] 贾宏涛[1] 赵成义[2] 胡玉昆[2] 李丽君[1] 

机构地区：[1]新疆农业大学草业与环境科学学院,新疆乌鲁木齐830052 [2]中国科学院新疆生态与地理研究所,新疆乌鲁木齐830011

出　　处：《干旱区研究》2012年第6期997-1002,共6页Arid Zone Research

基　　金：国家自然科学基金(40901155);中国科学院战略性先导科技专项(XDA05050405);土壤学自治区重点学科资助

摘　　要：以中国科学院新疆生态与地理研究所巴音布鲁克草原生态站的长期围栏封育样地为对象,利用经典统计学和地统计学相结合的方法,研究长期围栏封育对亚高山草原土壤有机碳空间变异特征的影响。结果表明:①长期围栏封育可以增加土壤有机碳含量,围栏内0～20 cm土壤有机碳含量均值为40.76 g/kg,围栏外土壤有机碳含量均值为38.50 g/kg;围栏内20～40 cm土壤有机碳含量均值为20.98 g/kg,围栏外土壤有机碳含量均值为18.70g/kg,土壤有机碳在水平方向上围栏内均高于围栏外;②围栏内土壤有机碳的变异性程度均显著高于围栏外,不管是围栏内外、上层和下层,土壤有机碳均具有中等的空间相关性,且上层土壤的有机碳变异程度均高于下层土壤;③土壤有机碳在水平空间分布呈现出不均匀性,围栏内土壤有机碳含量空间分布水平高于围栏外,在空间插值图上看,围栏内外0～20 cm土壤有机碳含量高的位置,在20～40 cm土壤有机碳含量却相反。In this study,the long-term fenced sample plots located in the Bayanbulak Steppe in the central Tianshan Mountains were focused,classical statistics and geostatistics were used to study the effects of long-term enclosure on the spatial variation of soil organic carbon content in the subalpine steppe.The results were as follows：（1） Long-term enclosure can increase soil organic carbon content,the average organic carbon content was 40.76 g/kg in soil layer of 0-20 cm in depth inside the fenced steppe,and it was 38.50 g/kg outside the fenced steppe;the average organic carbon content was 20.98 g/kg in soil layer of 20-40 cm inside the fenced steppe,and it was 18.70 g/kg outside.Soil organic carbon content inside the fenced steppe was higher than that outside at horizontal direction;（2） Variation degree of soil organic carbon content inside the fenced steppe was significantly higher than that outside.There was a moderate spatial correlation between organic carbon contents in the upper and lower soil layers no matter inside or outside the fenced steppe,and the variation degree of organic carbon content in the upper soil layer was higher than that in the lower soil layer;（3） Spatially,the distribution of soil organic carbon was different from different places,the soil organic carbon content in spatial distribution inside the fenced steppe was higher than that outside.From the spatial interpolation map,it was found that,if the soil organic carbon content in soil layer of 0-20 cm was high both inside and outside the fenced steppe,the soil organic carbon content in soil layer of 20-40 cm was oppositely low.

关 键 词：围栏封育 土壤有机碳 空间变异 亚高山草原 巴音布鲁克 

分 类 号：S812.2[农业科学—草业科学]