近30年来川中紫色丘陵区土壤碳氮时空演变格局及其驱动因素  

Spatio-temporal Variations of Soil Organic Carbon and Total Nitrogen and Driving Factors in Purple Soil Hilly Area of Mid-Sichuan Basin in the Past 30 Years

作　　者：罗由林 李启权[1,2] 王昌全[1] 付月君[1] 辛志远[1] 李冰[1] 袁大刚[1] 

机构地区：[1]四川农业大学资源学院,成都611130 [2]四川农业大学资源与地理信息技术研究所,成都611130

出　　处：《土壤学报》2016年第3期582-593,共12页Acta Pedologica Sinica

基　　金：国家自然科学基金项目(4120124);四川省科技支撑计划项目(2012JZ0003)资助~~

摘　　要：基于1981年全国第二次土壤普查数据和2012年555个表层土壤实测数据,探讨近30年来川中紫色丘陵区土壤碳氮时空演变特征及其驱动力。运用方差分析和回归分析对比了地形、成土母质、土壤类型、土地利用方式、植被对土壤有机碳(SOC)、全氮(TN)时空演变的影响。结果表明研究区1981年和2012年表层SOC含量上升110%,TN含量上升27.27%,变异系数均呈下降趋势。近30年来,SOC、TN由于受结构性因素和随机性因素共同影响变为更倾向于受随机性因素的影响,时空演变上大部分区域SOC、TN含量均有增加。近30年来土地利用方式对研究区SOC、TN时空变异的影响增强并成为主导因素,土壤类型的影响下降,地形因子的影响程度大幅下降而植被贡献率上升。全区碳氮含量及碳氮比值上升,碳氮之间的相关系数有所下降。Soil organic carbon（SOC）and soil nitrogen（TN）are two important elements essential for vegetation growth,and meanwhile the major contributors of greenhouse gases,affecting the entire eco-environmental system. Accurate knowledge of how SOC and TN varies spatially and temporally and their driving factors at a regional scale is of some great significance to extrapolation of balanced fertilization based on soil C and N regulation as well as protection of the ecological environment. Therefore,based on the data gathered during the 2nd National Soil Survey in 1981 and the measured data of 555 soil samples（0～20cm）collected in 2012,exploration was done of characteristics of the temporal and spatial evolution of organic carbon（SOC）and total nitrogen（TN）and it＇s driving factors in the Purple Soil Hilly area of Mid-Sichuan Basin over the past 30 years. With the aid of GS＋7.0 and Arc GIS9.3,spatial structure and spatial distribution of the two nutrient elements was analyzed. By means of classic statistics analysis,variance analysis（ANOVA）and regression analysis,comparison was performed of soil parent material,soil type,land use type,topography and vegetation in impact on spatial-temporal evolution of SOC and TN under different. The classical statistical analysis indicates that the mean content of SOC in the topsoil layer was 6.41 g kg^-1 in 1981 and 13.46 g kg^-1 in 2012,with coefficient of variation being 72.59% and 48.87%,respectively,and the mean content of TN was 0.88 g kg^-1 in 1981 and 1.12 g kg^-1 in 2012,with coefficients of variation being 40.04% and 38.75%,respectively. Apparently,the mean content of SOC increased by 109.98% and the mean content of TN by 27.27%,while their coefficients of variation showed a decreasing trend,The spatial structure analysis reveals that over the past 30 years,SOC and TN was affected jointly by structural and random factors,but tended to be more affected by random factors. The Arc GIS9.3 interpolation shows that SOC and TN contents increased in most parts of

关 键 词：土壤有机碳 全氮 时空演变 驱动力 川中紫色丘陵区 

分 类 号：S151.9[农业科学—土壤学] S154.1[农业科学—农业基础科学]