新疆伊犁地区草地土壤全碳含量空间格局分析  

Spatial analysis of the soil total carbon in Ili,Xinjiang Uygur Autonomous Region,China

作　　者：周李磊[1,2] 朱华忠[1] 钟华平[3] 杨华[2] 

机构地区：[1]中国科学院地理科学与资源研究所资源与环境信息系统国家重点实验室,北京100101 [2]重庆师范大学地理与旅游学院三峡库区地表过程与环境遥感重庆市重点实验室,重庆400047 [3]中国科学院地理科学与资源研究所陆地表层格局与模拟院重点实验室,北京100101

出　　处：《草业科学》2016年第10期1963-1974,共12页Pratacultural Science

基　　金：科技部国家科技基础性工作专项(2012FY111900-2;2011FY110400-3);国家科技基础条件平台--地球系统科学数据共享平台(2005DKA32300)

摘　　要：为了研究伊犁地区草地土壤碳库的空间分布规律,本研究基于146个草地样地的土壤全碳含量实测数据,结合遥感及气象数据,并利用地理学相关分析方法,构建土壤全碳含量空间化模型,分析了伊犁地区草地不同土壤深度全碳含量空间格局特征,并对影响土壤全碳含量分布的主要因素进行探讨。结果表明,1)伊犁地区草地不同土壤深度(0-10、10-20、20-30、30-40cm和4个土层均值)的全碳含量与海拔、年均气温、≥10℃年积温和8月份NDVI极显著相关(P<0.01),与年均降水和湿润度显著相关(P<0.05),以这6个生态要素建立土壤全碳含量空间化模型,反演得到空间分辨率1km的不同草地深度土壤全碳含量空间格局分布数据,检验结果表明空间化结果精度较高。2)伊犁地区草地0-40cm土层土壤全碳平均含量为4.251 9%,并随着土层深度的增加,草地土壤全碳含量呈下降趋势。3)伊犁地区空间化结果反映不同深度土壤全碳含量空间格局存在差异,土壤全碳含量最小值出现在伊犁河沿岸两侧及特克斯河与伊犁河交汇处人类活动密集的区域,最大值均出现在南、北天山两侧,并沿着伊犁河向两侧高海拔区域逐渐增加。4)伊犁地区草地不同深度土壤全碳含量空间分布规律与草地类型分布规律一致;人为活动干扰(过度放牧、盲目开垦)对草地土壤全碳含量影响较大。Currently,the studies of soil total carbon of grassland are mainly focused on traditional statistical analysis based on survey data and spatial analysis of soil total carbon are limited.The present study attempted to apply multi-source data including field survey soil total carbon data,remote sensing data and meteorological data obtained from 146 grassland sampling plots by using geostatistics to study the spatial analysis of soil total carbon data in the Ili region,located at the northwest margin of Xinjiang Uygur Autonomous Region.The results show that there was a significant correlation between the total carbon content from various depths（0-10,10-20,20-30,30-40 cm and the mean of four soil depths）and altitude,average annual temperature,annual precipitation,≥10℃annual accumulated temperature,humidity and NDVI.A comprehensive evaluation model was established using this six ecological factors,and the spatial distribution pattern of grassland soil total carbon content was inversed with 1km spatial resolution.The soil total carbon content in 0-40 cm depth was4.2519% and it decreased with the increase of soil depth.The results indicated that the spatial distribution of soil total carbon content in different depths significantly varied in areas of Ili.The total carbon content in high altitude region was higher than that of the river valley.The highest total carbon content was distributed on northern slopes of the Southern Tianshan mountains and southern slopes of Boluokenu mountains,and the lowest was found in intensive human activity areas,distributed in both sides of Ili river and interchange of the Teks River and the Ili River.The results indicated that the spatial distribution of soil total carbon content was correlated with the types of grassland in Ili,soil total carbon content significantly influenced by human activities,i.e.overgrazing,blind land reclamation.

关 键 词：土壤全碳 空间格局 地统计学 草地 伊犁地区 

分 类 号：S812.2[农业科学—草业科学]