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本文用一元线性模型理论分析了辽宁西部朝阳、建平、喀左和北票(市)4县17个乡范围内的农田防护林主要树种——杨树(Populus spp.)、白榆(Ulumus pumila)的优势高与地形地貌、土壤肥力等立地条件因子的关系,确定地貌类型、坡位和土层厚度是本区农田防护林立地条件的主导因子,然后以地貌类型为单元将本区农田防护林的立地条件划分为3个大类型。在此基础上,再用坡位和土层厚度分级与3个大类型组合细分为6个基本类型。最后确定各立地条件类型的适宜树种,并定量地评价主要树种对各立地条件类型的适宜性。
In this paper, Populus spp., Ulmus pumila (Populus spp.), The main tree species of farmland shelterbelts in 17 counties in 4 counties of Chaoyang, Jianping, Kazuo and Beipiao (cities) ) And the topographic conditions, soil fertility and other site conditions to determine the relationship between factors to determine the type of landform, slope position and soil thickness is the dominant factor in the site of farmland shelterbelts, and then the type of unit in this area of farmland shelterbelts Site conditions divided into three major types. On this basis, subdivided into six basic types by using slope position and thickness classification of soil layers together with three large type combinations. Finally, the suitable tree species for each site condition were identified and the suitability of the main tree species for each site condition was quantitatively evaluated.