摘要
选取长江三角洲典型地区——原锡山市作为研究区域,以1982和2005年土壤全氮和速效氮作为研究对象,探讨区域土地利用变化对土壤氮含量的影响。通过统计分析表明,20年来原锡山市土壤全氮含量降低0.16 g/kg,速效氮含量降低7.63 mg/kg。通过变异函数分析,20年来原锡山市全氮和速效氮的变异函数理论模型呈指数型,但块金方差与基台值的比值、自相关阀值发生了较大变化;Kriging插值分析结果表明,1982年全氮和速效氮分布较简单,2005年全氮分布较复杂,速效氮分布较简单,同时kriging插值分析还表明,20年来原锡山市土壤全氮含量降低,空间变异变化显著;土壤速效氮含量变化较小,空间差异变化明显。
Land use change may influence a variety of natural and ecological processes,including soil nutrient, soil moisture, soil erosion,land productivity and biodiversity. The major problem faced by the sustainable development of the former Xishan region in the Yangtze River Delta was the harmonious development of economy and environment. In recent years,the eco-environment of the region has become vulnerable due to the high intensity of human activities and increase of population. In this paper, taking Xishan region as the study area,a new database of total nitrogen and available nitrogen in soils of the region was established by laboratory analysis on soil samples collected in 2005 and by comparison with relative data of 1982. The spatial-temporal variation of N element in former Xishan City between 1982 and 2005 was analyzed through application of geo-statistics combined with GIS. Independent geo-statistics showed that all nitrogen decreased 0.16 g/kg,and available nitrogen decreased 7.63 mg/kg; semivariogram model indicated that the model for all nitrogen and available nitrogen in former Xishan City remain unchanged,whereas the ratio of Nugget/Sill and the correlation threshold changed significantly. The results of Kriging interpolation indicated that,the spatial distribution patterns of total nitrogen in 1982 and available nitrogen in 1982 and 2005 were simple,and the pattern of total nitrogen was rather complex in 2005; total nitrogen content decreased during these years,and its spatial variation changed significantly; the change of available nitrogen content was little with a significant change of spatial variation.
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2008年第1期36-42,共7页
Resources and Environment in the Yangtze Basin
基金
国家自然科学基金项目(40371106
70341021)
江苏省自然科学基金(BK2005080)联合资助
关键词
土地利用变化
全氮
速效氮
原锡山市
land use change
all nitrogen
available nitrogen
former Xishan City
