基于MaxEnt下梭梭潜在地理分布对水热条件的响应  

Responses of Haloxylon ammodendron potential geographical distribution to the hydrothermal conditions under MaxEnt model

作　　者：付贵全 徐先英[1] 马剑平[1] 徐梦莎[1] 刘江[1] 丁爱强 

机构地区：[1]甘肃省治沙研究所,荒漠化与风沙灾害防治国家重点实验室培育基地,甘肃兰州730070

出　　处：《草业科学》2016年第11期2173-2179,共7页Pratacultural Science

基　　金：国家重点基础研究发展计划(2012CB723203);国家自然科学基金项目(41161006、31260129);国家科技支撑项目(2012BAD16B0203);甘肃省沙生植物保护利用科技创新团队资助项目(1207TTCA002)

摘　　要：以梭梭(Haloxylon ammodendron)为研究对象,通过收集整理梭梭已知地理分布坐标和20个高分辨率环境因子图层,基于MaxEnt模型和GIS技术探讨了水热条件对梭梭潜在地理分布的影响、主要影响因子及其阈值。研究结果表明,1)梭梭在我国的潜在地理分布范围为新疆大部分地区、内蒙古西南、甘肃中部以北、宁夏西北部、青海海西蒙古族藏族自治州中间地带以及西藏西南部。其中最佳适生区为准噶尔盆地大部分地区、博罗科努山西南、哈尔他乌山东南,吐鲁番和库尔勒有零星分布,阿拉善左旗、鄂尔多斯、呼和浩特和乌兰察布的东南部,武威东北部、张掖大部分地区,格尔木以东以及乌兰县和都兰县西北零星分布。以上面积合计为2.95×105 km^2。2)年降水量(贡献率27.5%)、最湿季节降水量(贡献率20.3%)、年均气温(贡献率14.2%)和最干季节平均温度(贡献率10.1%)是影响梭梭在我国潜在地理分布的主要影响因子。3)各主要影响因子的阈值分别为年降水量15.0-114.5mm;最湿季节降水量8.0-59.5mm;年均气温-12.7-29.2℃;最干季节平均温度-33.3-35.9℃。上述研究结果可应用于梭梭适生区的种植区和保护区区划并为管理者决策提供参考。The MaxEnt model and GIS technology were employed to study the responses of Haloxylon ammodendron potential geographical distribution to the hydrothermal conditions in China and the main factors and threshold based on collected geographical distribution of the known coordinates and 20high-resolution environmental factor layers.The results showed that the potential geographical distribution range were Xinjiang except small amounts in the south and center of Hotan,the southwest of Inner Mongolia,the north of central Gansu,the northwest of Ningxia,the middle of Qinghai Hercynian Mongolian and Tibetan autonomous prefecture and the southwest of Tibetan autonomous prefecture.Among them,the most suitable distribution region were the most regions of Junggar Basin,the southwest of Boluo wild mountain,the southeast of Halitosan mountain and little region in Turpan and Korla.There were scattered distribution in the southeast of Alxa Left Banner,Ordos,Hohehot Municipality and Wulanchabu,the northeast of Wu wei,the most region of Zhang ye,the east of Golmud,the northwest of Ulan and Dulan County.The total area was 2.95×105 km^2.The dominate climatic factors influencing potential distribution of H.ammodendronin China were annual precipitation,precipitation of wettest month,annual mean temperature and mean temperature of driest season which had contribution rate of 27.5%,20.3%,14.2% and 10.1%,and threshold of 15.0~114.5mm,8.0~59.5mm,-12.7~29.2 ℃and-33.3~35.9 ℃,respectively.These research results can be applied to the suitable and reserve areas classification and provide reference for management decisions.

关 键 词：MaxEnt模型 阈值 影响因子 潜在地理分布 梭梭 

分 类 号：Q948[生物学—植物学]