基于GIS的谷城县耕地地力评价

Assessment on the Soil Fertility of Farmland in Gucheng County Based on GIS

采用传统土壤调查方法和GIS技术相结合,对湖北省谷城县耕地的土壤养分、耕地等级进行了调查,并与1982年第二次土壤普查的结果进行了分析和比较。结果表明,谷城县耕地以二等地为主;耕地多以中性为主,全氮含量处于中等偏下水平,有机质含量处于中等偏上水平,同时速效磷能满足植物生长的需要,速效钾基本处于正常水平;与第二次土壤普查结果相比,谷城县耕地总面积减少,土壤pH有向中性发展的趋势,土壤全氮含量略有下降,有机质含量变化不大,有效磷含量大幅度增加,速效钾含量变化不大;土壤有效铜、有效铁含量较高,成为农作物生长的限制因素,有效锌含量能满足作物生长需要。

Combining traditional soil survey method and GIS technology,soil nutrient and grade of farmland in Gucheng county Hubei province were investigated,and compared and analyzed with the data of the second general detailed soil survey in 1982.Results indicated that the grade of farmland in Gucheng county was mainly grade Ⅱ.And the soil pH of farmland was generally neutral.Total nitrogen content was on mediocre level;content of organic matter was on medium-high level;while content of available phosphorus could meet the needs of plant growth;content of available potassium was on normal level.Compared with the data of the second general detailed soil survey,the total area of farmland in Gucheng county decreased;soil pH had the developing trend of being neutral;soil total nitrogen content slightly decreased;organic matter content and available potassium content changed a little;available phosphorus content increased significantly.The content of available copper and iron in soil was relatively high,which restricted the growth of crops.Content of available zinc met the needs of crops.