在 desertification 的气候变化和人的活动的相对角色是关于动态的 desertification 和它的开车机制的研究的热点。为了克服存在的缺点,学习,选择的这篇论文作为指示物捕捞主要生产率(NPP ) 分析动态的 desertification 和它的影响因素。另外,实际 NPP ,潜在的 NPP 和 HNPP ( NPP ,潜在的 NPP 之间的差别和实际 NPP 的人的拨给)的变化趋势被用来分析动态的 desertification 并且计算气候的相对角色变化,人的活动和在 desertification 的二个因素的联合。在这研究,中等分辨率成像分光辐射函数(MODIS ) 使差别植被索引(NDVI ) 正常化,气象学的数据被利用驱使 Carnegie-Ames-Stanford 途径(房屋) 模型在 Heihe 河盆从 2001 ~ 2010 计算实际 NPP。潜在的 NPP 用 Thornthwaite 纪念的模型被估计。结果证明 61% 整个盆区域经历了陆地降级, 90.5% 被人的活动引起, 8.6% 由气候变化,并且 0.9% 由二个因素的联合。相反, 1.5% desertification 回复区域被人的活动引起, 90.7% 由气候变化,剩余的 7.8% 由二个因素的联合。而且, 95.9% 全部的实际 NPP 减少被人的活动导致,这被表明,当 69.3% 全部的实际 NPP 增加被气候引起时,变化。结果表明那个气候变化统治了 desertification 回复,当人的活动统治了 desertification 扩大时。而且,两个气候变化的相对角色和在 desertification 的人的活动拥有了大空间异质。另外,生态的保护政策应该在 Heihe 河盆被提高在气候变化的条件下面阻止 desertification 扩大。
Relative roles of climate change and human activities in desertification are the hotspot of research on desertification dynamic and its driving mechanism.To overcome the shortcomings of existing studies,this paper selected net primary productivity (NPP) as an indicator to analyze desertification dynamic and its impact factors.In addition,the change trends of actual NPP,potential NPP and HNPP (human appropriation of NPP,the difference between potential NPP and actual NPP) were used to analyze the desertification dynamic and calculate the relative roles of climate change,human activities and a combination of the two factors in desertification.In this study,the Moderate Resolution Imaging Spectroradiometer (MODIS)-Normalised Difference Vegetation Index (NDVI) and meteorological data were utilized to drive the Carnegie-Ames-Stanford Approach (CASA) model to calculate the actual NPP from 2001 to 2010 in the Heihe River Basin.Potential NPP was estimated using the Thornthwaite Memorial model.Results showed that 61% of the whole basin area underwent land degradation,of which 90.5% was caused by human activities,8.6% by climate change,and 0.9% by a combination of the two factors.On the contrary,1.5% of desertification reversion area was caused by human activities and 90.7% by climate change,the rest 7.8% by a combination of the two factors.Moreover,it was demonstrated that 95.9% of the total actual NPP decrease was induced by human activities,while 69.3% of the total actual NPP increase was caused by climate change.The results revealed that climate change dominated desertification reversion,while human activities dominated desertification expansion.Moreover,the relative roles of both climate change and human activities in desertification possessed great spatial heterogeneity.Additionally,ecological protection policies should be enhanced in the Heihe River Basin to prevent desertification expansion under the condition of climate change.