基于地形因素的新疆荒漠植被-气候模型应用研究

Application of Landform-based Desert Vegetation-Climate Model in Xinjiang Uygur Autonomous Region

本研究在新疆荒漠植被型分类的基础上,用植被与气候Holdridge生命带模型进行荒漠植被型的模拟,并用Kappa检验系数进行结果检验,模拟结果很差(0.19),将地形作为模拟模型具体考虑的一个因素,对重新分类的气候区进行二次植被模拟。二次模拟结果Kappa检验系数平均值为0.45,二次模拟整体荒漠植被型模拟结果的Kappa检验系数为0.64,极大地提高了模型模拟的准确度。模型模拟准确度的提高在于将影响新疆水分分配的地形因素作为改进Holdridge生命带模型的参数,该参数的引入为提高Holdridge生命带模型的准确度提供了新的思路,也为较准确地模拟新疆地区的植被提供了新途径。

Based on the classification of desert vegetations in Xinjiang,the paper employs the Holdridge life zone model to simulate the desert vegetation types in Xinjiang and adopts Kappa coefficient to verify the simulation finding that it performs poorly （Kappa coefficient：0.19）. Then,it simulates the types of desert vegetation in the reclassified climatic zones with landform as a factor once again. The average Kappa coefficient is 0.45 in the reclassification of the climatic zones and the Kappa coefficient is 0. 64 in the second simulation of all the desert vegetations, which indicates a great increase in the simulation accuracy. The increased accuracy in the simulation model mainly contributes to taking landform affecting water distribution in Xinjiang as a parameter in modifying Holdridge life zone model and the integration of this parameter creates a new approach to raising the accuracy of Holdridge life zone model and a new way to simulate the vegetations in Xinjiang more accurately.