Research on Ecological Suitability Regionalization of Zanthoxylum planispinum var.dingtanensis in Zhenfeng County,Guizhou Province
[Objective]The main ecological factors affecting the growth of Zanthoxylum planispinum var.dingtanensis were investigated,and its ecological adaptability was studied,which provided reference for the scientific layout of Z.planispinum var.dingtanensis planting and the sustainable development of the industry.[Method]Based on the climate,soil and topography data of each township in Zhenfeng County,the principal component analysis method was used to determine the weights of the primary indicators(climate,soil and topography)and the secondary indicators(annual average temperature,extreme high temperature and sunshine duration,etc.),and the weighted superposition method of Arc Map was used to assign points to the planting suitability indexes of Z.planispinum var.dingtanensis,and the climate,soil,topography and comprehensive suitability zoning map were drawn.[Result]The weights of ecological factors affecting the growth of Z.planispinum var.dingtanensis were climate(0.558)＞topography(0.233)＞soil(0.209).The main ecological factor was climate,including average annual temperature,extreme high temperature,sunshine duration,annual average rainfall and frost-free period.According to the comprehensive evaluation grade of suitability,it was divided into the most suitable area(4 points),suitable area(3 points),sub-suitable area(2 points)and unsuitable area(1 point).The most suitable areas for Z.planispinum var.dingtanensis in Zhenfeng County were mainly distributed in the northern,central,southern and southeastern areas,including Pingjie Township,Beipanjiang Town,Zhexiang Town,Mingu Street,Wanlan Town,Lianhuan Township,Lugong Town,Lurong Township and Shaping Town,and were partially distributed in the western Baiceng Town and central Longchang Town,with annual average temperature of 15-20℃,extreme heat of 33-40℃,sunshine duration＞1 600 h,annual average rainfall of 1 000-1 200 mm,frost-free period of 340-365 d.And the texture of the soil was sandy loam or loam,with pH of 6.5-7.5,elevation of 700-1 200 m and slope of 15°-20°.The suitable areas were mainly distributed in the west,including Changtian Town,Xiaotun Town,Longchang Town and eastern Baiceng,with annual average temperature of 10-15℃,extreme heat of 26-33℃,sunshine duration of 1 400-1 600 h,annual average rainfall of 800-1 000 mm and frost-free period of 320-340 d.The soil texture was sandy loam and sandy with pH of 6.0-6.5,elevation of 400-700 m,slope of 5°-15°and 20°-35°.[Conclusion]The overall suitability of Z.planispinum var.dingtanensis in Zhenfeng County is relatively high,and the main ecological factor affecting the suitability distribution is climate.The most suitable areas are mainly distributed in the northern,central,southern and southeastern regions,including Pingjie Township,Beipanjiang Town and Zhexiang Town,etc.
万方数据
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