摘要
土壤养分的空间分布特征是合理平衡施肥及实现特色优质农业的重要依据。通过对湖南省汨罗市耕地区土壤进行1∶5万土地质量地球化学调查,分析了土壤的pH值、有机质(OM)、全氮(N)、全磷(P)、全钾(K)等养分要素,采用地统计学方法与GIS相结合的方法对土壤养分要素空间分布特征及其变异规律进行研究。结果表明:汨罗市耕地区土壤整体呈弱酸性(pH值<7),有机质和氮含量相对富集;各项指标中磷含量变异系数最大,pH值的变异系数最小。地统计学方法表明,钾的空间相关性极强,其余养分要素空间相关性中等,空间变异程度依次为:K>pH>N>OM>P。综合分析成土母质、土壤类型、土地利用类型等因素,GIS空间分析解析出了土壤养分空间分布规律:有机质与氮空间分布情况相近,呈现出西部和中部城区分布较高,其余地区较为均衡;pH值与磷在地域上呈一定的均匀分布;钾分布具有较强的规律性,中西部含量较高,向东南逐级递减。
The spatial distribution of soil nutrients is an important factor in rational balanced fertilization and realizing characteristic high-quality agriculture.Through the 1:50000 geochemical investigation of soil quality in the cultivated land of Miluo City,Hunan province,the pH value,organic matter(OM),total nitrogen(N),total phosphorus(P)and total potassium(K)of soil samples were analyzed.The spatial distribution characteristics and variation law of soil nutrient elements were studied by the combination method of geostatistics and GIS.The results showed that the soil was weakly acidic(pH<7),and the contents of OM and N were relatively enriched;the coefficient of variation of total P content was the largest while that of pH value was the smallest.Geostatistical methods showed that the spatial correlation of K was very strong,while that of other elements was medium,and the degree of spatial variation was K>pH>N>OM>P.Based on the the comprehensive analysis of soil parent material,soil type,land use type and other factors,the spatial distribution law of soil nutrients is worked out by GIS spatial analysis:the spatial distribution of OM and N is similar,higher in the western and central urban areas and balanced in the rest areas;pH value and P are evenly distributed in the study area;and K is regularly distributed,with high content in the central and western of the study area and decreasing gradually to the southeast area.
作者
肖凯琦
董好刚
郭军
李毅
陈彪
XIAO Kai-Qi;DONG Hao-Gang;GUO Jun;LI Yi;CHEN Biao(Changsha Natural Resources Comprehensive Investigation Center,China Geological Survey,Changsha 410000,Hunan,China)
出处
《华南地质》
CAS
2021年第4期369-376,共8页
South China Geology
基金
中国地质调查局项目“岳阳市耕地区土地质量地球化学调查(DD20200871)”。
关键词
土壤养分
空间变异
地统计学
GIS
湖南省汨罗市
soil nutrients
spatial variability
geostatistics
GIS
Miluo City,Hunan Province
