不同土壤肥力水平下毛竹林冠层氮含量分布特征

Distribution Characteristics of Nitrogen Content in Canopy of Phyllostachys pubescens Forest under Different Soil Fertility Levels

为实现遥感估算林冠层氮含量以指示土壤肥力丰缺情况,以顺昌县毛竹林为研究对象,测定毛竹林地土壤速效钾、水解氮、有效磷、pH等土壤肥力评价指标及其林冠层氮含量,确定土壤肥力(FQI)值,分析林冠层氮含量与土壤肥力之间的关系,构建"林冠层氮含量—土壤肥力"的估测模型.结果表明:毛竹林冠层氮含量与其土壤肥力存在正相关关系,其中一元线性、二元线性、指数、对数等模型可反映这种关系,表达二者关系最佳的模型是二次线性模型(FQI=-0.008 6×N^2+0.523 4×N-7.139 1),精度为75.65%.

To estimate canopy nitrogen content by remote sensing,to indicate soil fertility abundance and deficiency,with Phyllostachys pubescens forest in Shunchang County as the research object,the determination of soil available potassium,hydrolysis of nitrogen and phosphorus and p H of soil fertility evaluation index and forest canopy nitrogen content,determine soil fertility( FQI)value,analyze the relationship between canopy nitrogen the content of forest and soil fertility,to construct the estimation model of "forest canopy nitrogen content-soil fertility". The results show that: there is a positive correlation between nitrogen content and soil fertility of Moso bamboo stands,one yuan,two yuan of linear linear,exponential and logarithmic model can reflect the relationship between the expression of the relationship between the two,the best model is the two linear model( FQI =-0. 008 6 × N^2+ 0. 523 4 × N-7. 139 1),the precision is 75. 65%.