晋西黄土残塬沟壑区立地条件类型划分的研究

此项研究根据环境因子划分立地条件类型,用“数量化理论Ⅰ”分析了土壤水分与其它环境因子之间,以及刺槐人工林地的优势木平均树高与林地某些因子(地形、黄土母质类型和造林前的土地利用类型)之间的关系。结果认为,土壤水分因子是影响当地刺槐人工林生长的主导因子,而土壤水分状况主要受当地地形因素的影响。提出了该地区土壤水分等级表,和刺槐人工林标准林龄优势木平均树高的预测方程式。并编制了适合该地区的立地条件类型表,绘制了1355.0公顷面积范围内的立地图。

A STUDY ABOUT THE CLASSFICATION OF SITE TYPES OF GULLY LOESS AREA IN WEST SHANXI

The site types were classfied according to enviromental factors in this paper. Both of the relationships between soil water and other enviromental factors, and between the mean height of dominant trees and some factors of site (topography, the type of lithic and the soil type utilized) were analysed with quantitative theory I . The results showed major factor influncing the growth of local artificial forest of locust (Robinia pseudoacacia L. ) was soil water condition affected mainly by local topographic factors. A table of local soil water class and forecasting equation of mean height of dominant trees of artificial locust forest with base age were established in this paper. A table of the site types suit for this region and a site map within the area of 1335.0 hectares were made as well