杭州湾南岸土壤有机碳空间异质性研究  

SPATIAL HETEROGENEITY OF SOIL ORGANIC CARBON ON THE SOUTH COAST OF HANGZHOU BAY

作　　者：张文敏[1] 姜小三[1] 吴明[2] 邵学新[2] 周斌[3] 

机构地区：[1]南京农业大学资源与环境科学学院,南京210095 [2]中国林业科学研究院亚热带林业研究所,国家林业局杭州湾湿地生态系统定位观测研究站,浙江富阳311400 [3]杭州师范大学理学院遥感与地球科学研究院,杭州311121

出　　处：《土壤学报》2014年第5期1087-1095,共9页Acta Pedologica Sinica

基　　金：国家自然科学基金项目(31000296);中国林科院亚热带林业研究所基本科研业务费(RISF61256);杭州师范大学遥感与地球科学研究院开放基金(DDKF2011YG01)共同资助

摘　　要：应用地统计学与地理信息系统相结合的方法,研究了杭州湾南岸慈溪市域内不同土层(0～20、20～40、40～60、60～80、80～100、0～100 cm)的土壤有机碳含量空间变异特征。结果表明:研究区各土层土壤有机碳平均含量变化范围为3.49～7.95 g kg-1,变异系数介于54.51%～67.34%之间,属中等程度变异;地统计分析得出块金效应变化范围为0.141～0.372,表现为较强空间自相关性;自表层至底层最优半方差模型依次为高斯、指数、指数、高斯和球状模型;Kriging插值结果显示各土层土壤有机碳含量自滩涂向内陆呈递增趋势,其中0～20 cm土层土壤有机碳含量呈平行于海岸线的带状分布;土壤有机碳含量随剖面深度增加呈递减规律;不同土地利用方式和不同围垦时期均增加了土壤有机碳的空间变异性。从研究结果看,慈溪市土壤有机碳空间异质性主要由结构性因素引起,研究结果可为了解杭州湾南岸土壤有机碳分布特征提供参考。A study was carried out using Geostatistics and Geographical Information System（ GIS） technologies to explore spatial variability of soil organic carbon content in different soil layers（ 0 ～ 20,20 ～ 40,40 ～ 60,60 ～ 80,80 ～100,0 ～ 100 cm） in Cixi City,on the south coast of the Hangzhou Bay. Results show that the average contents of soil organic carbon in the soil layers varied from 3. 49 g kg- 1to 7. 95 g kg- 1in the study area,with variation coefficients ranging from 54. 51% to 67. 34%,indicating a moderate degree of variability. Geostatistical analysis reveals that the value of nug-get effect varied from 0. 141 to 0. 372,displaying strong spatial correlation,and that the optimal semi-variance models for the soil layers from the surface down to the bottom of a soil profile were Gaussian,exponential,exponential,Gaussian and spherical model respectively; The results of Kriging demonstrate that soil organic carbon displayed an increasing trend from beach to inland in all the soil layers,and a decreasing trend with soil depth in a soil profile,and was distributed in the surface soil layer（ 0 ～ 20 cm） like a band in parallel with the coastline. Both different land use patterns and different reclamation history intensified spatial variability of soil organic carbon. All the findings indicating that the spatial variability of soil organic carbon is mainly caused by structural factors in Cixi City,may provide soil organic matter reference to the study to understand characteristics of the distribution of organic carbon in soils on the south coast of the Hangzhou Bay.

关 键 词：土壤有机碳 空间变异 地统计学 杭州湾南岸 

分 类 号：S158.9[农业科学—土壤学]