论文部分内容阅读
研究翼首草的生态适宜性,为翼首草GAP种植选址和区域发展提供参考。通过中国数字标本馆、文献和实地考察等收集67个翼首草分布点,利用Maxent和GIS技术对翼首草进行适宜性分析。发现翼首草潜在分布区域主要分布在西藏东部、四川西部、青海南部、云南西北部、甘肃南部;对翼首草生长和分布贡献率大的主要生态因子为海拔(62%)、最暖季风降水量(14.4%)、降水量变异系数(7.2%)、最干季度平均温度(3.5%)、土壤导电率(3%)、阳离子交换总量(2.4%)、温度季节性变化标准差(2.2%)。应用Maxent模型对翼首草进行生态适宜性研究,其准确度高,可为翼首草野生抚育及GAP种植选址提供科学依据和参考。
To study the ecological suitability of Pterocephalus septentrionalis and provide reference for the site selection and regional development of Pterocephalus pachyrhizus GAP. Through the Chinese digital herbarium, literature and field investigation, we collected 67 headrace distribution points and used Maxent and GIS to analyze the suitability of the headrace. It was found that the potential distribution areas of P. capitatum mainly distributed in eastern Tibet, western Sichuan, southern Qinghai, northwestern Yunnan and southern Gansu. The main ecological factors contributing to the growth and distribution of P. capitatum were altitude (62%), the warmest monsoon Precipitation (14.4%), coefficient of variation of precipitation (7.2%), average temperature in the driest quarter (3.5%), soil conductivity (3%), total amount of cation exchange 2.2%). The Maxent model was used to study the ecological suitability of Pterocephalus kirilowii Maxim. Its accuracy was high, which could provide a scientific basis and reference for the wild tending of Gynura divaricata and the location of GAP planting.