基于气候-地形-土壤因子和GIS技术的浙江省香榧种植综合区划

Comprehensive Regionalization of Torreya grandis ‘Merrillii’ Cultivation Based on Climate,Terrain and Soil Factors by GIS Technology in Zhejiang Province

根据香榧的生物学特性及其对环境条件的需求,构建香榧种植综合区划评价体系,提出香榧综合区划指标为3个气候因子、2个地形因子和2个土壤因子,建立区划指标的空间分布模型。应用混合插值法完成区划指标的细网格化。应用加权指数求和法,建立综合区划评估模型。考虑土地利用现状,屏蔽不宜种植地域,把浙江省香榧种植区域划分为适宜、较适宜和不适宜3个等级。借助GIS技术制作香榧种植精细化的专题区划图,空间精度为100m×100m。综合区划结果可为浙江省香榧生产提供科学依据。

Torreya grandis ‘Merrillii’ is an indigenous economic tree species in Zhejiang Province, but its potential economic value is not fully obtained because of the irrational regional distribution. The evaluation system of comprehensive regionalization was constructed according to its biological characteristics and the requirement to environmental factors which mainly included three climate factors, two topography factors and two soil factors. These regionalization indices were gridded by the mixed interpolation method. An evaluation model of comprehensive regionalization was established by using the index accumulation method （IAM）. Taking account of the land use condition and eliminating the unsuitable planting regions, the results mainly included three grades of the suitable region, sub-suitable region and unsuitable region. The refined regionalization map was drew by using GIS technology, and the regionalization indices were calculated according to the grids of 100 m×100 m. The results of this study would provide a scientific basis for the production of Torreya grandis ‘Merrillii’ in Zhejiang Province.