成都平原地下水硝酸盐含量空间变异研究  

SPATIAL VARIATION OF NITRATE CONTENT IN GROUNDWATER IN CHENGDU PLAIN

作　　者：刘英华[1] 张世熔[1] 张素兰[2] 魏甦[1] 肖鹏飞[1] 

机构地区：[1]四川农业大学资源环境学院,四川雅安625014 [2]四川省国土规划研究院,四川成都610037

出　　处：《长江流域资源与环境》2005年第1期114-118,共5页Resources and Environment in the Yangtze Basin

基　　金：四川省教育厅项目(01LA02)

摘　　要：采用格网方式,并结合重点抽样布点,运用地统计学方法中的普通克里格和概率克里格法对成都平原 76 个样点的地下水硝酸盐含量进行空间变异分析。结果表明,目前该区域地下水的硝酸盐含量总体水平不高,但局部区域有超标现象,12 %的区域未达到世界卫生组织规定的饮用水水质标准(小于10 mg/L), 5 %的地区未达到我国规定的生活饮用水卫生标准 (小于20 mg/L);其分布特点是北部 (7.38 mg/L)>东部(5.72 mg/L)>西部(3.91 mg/L)>南部(1.51 mg/L);彭州、郫县、新都三县(区)地下水硝酸盐含量超标的概率最大(0.25~0.50),而区域西北部的大邑县、都江堰以及南部双流县超标的概率最低。普通克里格和概率克里格两种方法的特点分析表明,前者表征了区域硝酸盐含量的空间变异及其分布规律,后者能较好地反映区域硝酸盐污染的风险性程度。Using grid and the hierarchical sampling method to distribute the places where these samplings were gathered, the spatial variation analysis for Nitrate content of 76 sampls for groundwater in Chengdu Plain was studied by Ordinary Kriging and Probability Kriging which are both geostatistical methods. The results show that Nitrate content (expressed with NO\-3^-) of groundwater is as a whole lower at present, but in some areas it exceeds criterion, about 12 percent of areas did not reached the drinking water quality criterion (less than 10 mg/L) prescribed by WHO, approximately 5 percent not at the drinking water quality criterion (less than 20 mg/L) prescribed by the Chinese government. The obvious distribution character of Nitrate content of groundwater is the north area (7.38 mg/L) > the east area (5.72 mg/L) > the west area (3.91 mg/L) > the south area(1.51 mg/L); The Nitrate content in groundwater in three counties, Pengzhou, Pixian and Xindu, located in the north of Chengdu Plain is likely to surpass the criterion mentioned above, with the probability varying from 0.25 to 0.50, However, in Dayi county, Dujiangyan city located in the northwest of the Chengdu Plain, including Shuangliu county located in the south of the plain much little, the probability is less than 0.05. At the same time, a conclusion can be drawn that the ordinary Kriging represents spatial variation characteristic of Nitrate content, and the other method can preferably reflect the hazard extent of pollution arisen by using Nitrate fertilizer.

关 键 词：硝酸盐含量 空间变异 成都平原 地统计学方法 北部 变异分析 南部 区域 风险性 大邑县 

分 类 号：X523[环境科学与工程—环境工程] S63[农业科学—蔬菜学]