基于GIS的南京市溧水区富硒土地资源开发利用研究

Exploitation and Utilization of Selenium Rich Land Resources in Lishui District of Nanjing City Based on GIS

[目的]对南京市溧水区富硒土地资源开发利用进行研究,为发展该区特色富硒农产品产业提供科学参考。[方法]在对溧水全区土壤采样并测试土壤化学性质的基础上,采用ArcGIS对土壤硒含量进行地统计和插值分析,选取最合适的拟合模型和插值方法,根据样点数据预测整个研究区土壤含硒情况,综合文献资料和溧水实际情况将富硒土地分级,明确富硒土地空间分布,结合土壤酸碱度划分出适宜种植富硒农产品的区域及种类。[结果]溧水区约有4.25%的富硒土地资源,呈块状或点状分布于各个乡镇,可以综合土壤酸碱度等因素开发作为富硒农产品的种植地。[结论]普通克里金方法中高斯模型可以很好地拟合出溧水区土壤富硒情况,并且研究区的富硒土地资源具有极大的开发空间和利用价值,需要进行合理规划,为开发区域特色农产品市场提供依据。

[Objective]The development and utilization of selenium rich land resources in Lishui District of Nanjing City were studied in order to provide scientific reference for developing local characteristic selenium enriched agricultural products industry.[Methods]On the basis of sampling and testing of soil chemical properties at Lishui Distriat,analysis of statistics and interpolation of soil selenium content by ArcGIS,selecting the most appropriate model and interpolation method,according to the prediction of the soil selenium sample point data,literature data and the actual situation of Lishui District,selenium enriched land was graded to understand its selenium spatial distribution.Areas that are suitable for planting selenium-rich agriculture products and the species were maped and listed.[Results]There is approximately 4.25%of the land resource of selenium rich in Lishui District,which distributed in townships in the form of block or spot,which can be developed as the planting land of the selenium rich agricultural products by combining the soil acidity and alkalinity.[Conclusion]The Gauss model in the common Kriging method can well fit the situation of soil rich selenium in Lishui District,and the selenium rich land resources in the study area have great development space and utilization value.It is necessary to make rational planning and provide basis for the development of regional characteristric agricultural products market.