近20年来太湖流域典型地区土壤酸度的时空变异特征  

SPATIAL AND TEMPORAL VARIABILITY OF SOIL ACIDITY IN TYPICAL AREAS OF TAIHU LAKE REGION IN THE LAST 20 YEARS

作　　者：刘付程[1] 史学正[2] 于东升[2] 

机构地区：[1]淮海工学院空间信息科学系,江苏连云港222001 [2]中国科学院南京土壤研究所,江苏南京210008

出　　处：《长江流域资源与环境》2006年第6期740-744,共5页Resources and Environment in the Yangtze Basin

基　　金：国家重点基础研究规划项目(G1999011810);淮海工学院自然科学基金和科研启动基金项目资助

摘　　要：以第二次土壤普查资料和近期采样分析数据为基础,运用地统计学方法研究了太湖流域典型区域土壤酸度的时空变异特征。结果表明,研究区域土壤总体上呈酸化趋势,表现在绝大部分(超过85%的面积)土壤的pH值发生不同程度的下降,且平均降幅达0.56个pH单位。同第二次土壤普查时期相比,土壤pH值空间变异的自相关性显著增强,但空间自相关距离明显减小,表明土壤pH值空间分布格局趋向复杂化,岛状分布更为明显。化学肥料的连年大量施用和工业污染物的长期排放是导致土壤趋向酸化和土壤酸度空间分布格局发生变化的主要原因。A geo-statistic method in combination with GIS was applied to characterize and map the spatialtemporal variability of soil pH in the typical area of Taihu Lake Region. The soil of the studied area appeared to be acid with about 85% of the total area showing a trend of decline in soil pH and its average decline extent being about 0.56 pH units. Since the Second Soil Survey, the soil pH spatial auto-correlation has become stronger and its auto-correlated distance has turned shorter, indicating that the soil pH distribution pattern has become complex. Based on the background information, it could be deduced that these changes had resulted from continual application of chemical fertilizers and large amount of acidic waste materials discharged from factories over last 20 years.

关 键 词：土壤酸度 时空变异 地统计学 太湖流域 

分 类 号：S153.621[农业科学—土壤学]