湘西植烟土壤有机质和全氮时空变异特征研究  

Temporal and Spatial Variability of Soil Total Nitrogen and Organic Matter in Tobacco-planting Area of Xiangxi,Hunan

作　　者：向世鹏[1,3] 向德明 田峰 张黎明 黎娟 周米良[2] 田明慧 李强 XIANG Shipeng;XIANG Deming;TIAN Feng;ZHANG Liming;LI Juan;ZHOU Miliang;TIAN Minghui;LI Qiang(College of Agronomy,Hunan Agricultural University,Changsha 410128,China;Xiangxi Branch of Hunan Provincial Tobacco Company,Jishou,Hunan 416000,China;Changsha Branch of Hunan Provincial Tobacco Company,Changsha 410007,China)Abstract:Based on the methods of classical statistics and geostatistics,the spatiotemporal variation of soil organic matter(SOM)

机构地区：[1]湖南农业大学农学院,长沙410128 [2]湖南省烟草公司湘西州公司,湖南吉首416000 [3]湖南省烟草公司长沙市公司,长沙410007

出　　处：《土壤》2020年第2期372-377,共6页Soils

基　　金：湖南省烟草公司项目(XX16-18Aa02)资助。

摘　　要：为揭示湖南省湘西州烟区土壤有机质(SOM)和全氮(TN)的时空变异特征和为合理施用有机肥和氮肥提供科学依据,采用经典统计学、地统计学和GIS等方法,对湘西州2000年和2015年植烟土壤SOM和TN时空变异特征进行了研究。结果表明:2015年SOM和TN平均含量较2000年分别增加了5.03g/kg和0.31g/kg,增幅分别达21.39%和21.99%,SOM和TN含量的最小值变小,变异系数、最大值和极差变大,Moran’sI指数标准化Z值下降,块金效应增加;SOM和TN含量"低""适宜"等级面积分别下降了3.42%、37.73%和2.04%、44.43%,"高""极高"等级面积分别增加了32.21%、8.94%和35.67%、10.80%。表明湘西植烟土壤SOM和TN含量和变异同时增加,SOM和TN空间自相关性减弱,随机变异性增强。植烟土壤SOM与TN含量表现出极显著的正线性相关,SOM的矿化释放是TN的一个主要来源。Based on the methods of classical statistics and geostatistics,the spatiotemporal variation of soil organic matter(SOM)and total nitrogen(TN)from 2000 to 2015 in tobacco-planting area of Xiangxi were studied in order to provide scientific basis for reasonable application of organic and nitrogen fertilizers.The results showed that from 2000 to 2015 average SOM and TN increased by 5.03 g/kg(21.39%)and 0.31 g/kg(21.99%),respectively.For SOM and TN,their minima decreased while variation coefficients,maxima and ranges increased.In the past 15 years,the normalized Z values of Moran’s I indexes of SOM and TN decreased,nugget effects increased;the"low"and"suitable"grade areas of SOM and TN decreased by 3.42%,37.73%and 2.04%,44.43%,respectively;while the"high"and"extremely high"grade areas of SOM and TN increased by 32.21%,8.94%and 35.67%,10.80%,respectively.In general,SOM and TN contents and their variations increased significantly in tobacco growing area of Xiangxi,the spatial autocorrelation of SOM and TN were weakened and the random variabilities were enhanced,and SOM showed an extremely significant positive linear correlation with TN,the mineralization and decomposition of soil SOM is the main source of TN.

关 键 词：湘西 植烟土壤 有机质 全氮 时空变异 

分 类 号：S572.06[农业科学—烟草工业]