基于遥感影像的土壤线空间变异规律及影响因素分析

土壤线不仅能反映土壤的光学特性，为土壤遥感分类提供依据，还能参与植被指数的计算，提高植被遥感监测的精度，因此计算不同影响因子下的土壤线参数以及探究土壤线的空间变异规律至关重要。论文以山东郯城土壤为研究对象，选取土壤类型和土壤有机质参与分析，结果表明：不同土壤类型的土壤线不同，潮土土壤线斜率(1.499 6)最大，其次是水稻土、棕壤、砂姜黑土，褐土最小（1.229 3），截距则相反；同种土壤类型下，土壤线斜率随有机质含量增加而增大，截距减小。综合分析可知：土壤线斜率随土壤类型变化大致呈从西向东先增大后减小、从北向南逐渐增大的趋势；相同土壤类型下，随有机质含量增加,土壤线斜率呈由中心向边缘逐渐增大、截距逐渐减小的趋势。

Spatial Heterogeneity of Soil Line Parameters and Analysis of Influencing Factors Based on Remote Sensing Image

Soil line not only can reflect the optical properties of the soil to provide a basis for soil remote sensing classification but also can be used to calculate the vegetation index to weaken the soil background information and improve the precision of vegetation remote sensing monitoring. However, there are many influencing factors, in order to improve the extraction accuracy of soil line, calculating the soil line parameters under different soil influencing factors and exploring the spatial patterns of soil line are becoming more and more critical. In this paper, we chose the soil in Tancheng County of Shandong Province as the research object, and selected the two biggest factors include soil types and soil organic matter contents which can affect soil line to be involved in analysis. We analyzed the changes of soil line parameters under different soil types, the results showed that: different types of soil had different soil lines, for the five soil classes in the study area, the size of the soil line parameters varied as follows: fluvo-attic soil had the maximum soil line slope (1.4996), followed by paddy soil, brown soil, mortar black soil, the smallest was cinnamon (1.2293), the relationship of intercept was in contrast with the slope. Under the same soil types we analyzed the influences of soil organic matter on soil line parameters, the results showed that in different organic matter zones, the soil line parameters were different, with the increase of organic matter content, the slope of the soil line increased but the intercept decreased. By comprehensive analyzing the spatial patterns of soil line we could get some conclusions as follows: With the changes of soil types, the slope of the soil line in the study was that it first increased and then decreased from west to east and had a gradual increasing trend from north to the south, at the same time it had a certain zonality law; under the same soil type, the soil line slope had a gradual increasing trend from the center to the edge but the intercept had a decreasing trend with the increase of soil organic matter content.