皖江城市带植被NPP时空变化及其气候响应

针对现有植被净初级生产力研究对城市圈、城市带尺度缺乏关注的问题,基于MODIS遥感数据、地面气象资料等,利用改进的CASA模型,结合回归分析、相关分析等方法探究了2000—2013年皖江城市带植被NPP的时空变化及其对气候因子的响应,为区域生态环境质量评价提供参考。结果表明:近14年来,皖江城市带植被NPP总体呈增加趋势;不同土地利用类型NPP差异显著,林地草地耕地建设用地未利用土地水体;年NPP均值呈现由南部向西北部减少的空间分布特征;植被NPP年际变化率较小,介于±10gC·m-2·a-1范围内;温度是影响研究区植被NPP时空变化的主要气候因子。

Temporal-spatial patterns of vegetation net primary productivity and its response to climate factors in Wanjiang city belt based on CASA model

In order to assess the NPP of Wanjiang City belt which in the central region of Anhui province,MODIS time-series remote sensing data,meteorological data,and improved CASA light energy utilization model were used.On this basis,the temporal-spatial distribution pattern and variation of NPP was analyzed,besides,the response of NPP to climate factors was explored by using regression analysis,correlation analysis and other methods.Results show that the vegetation NPP of Wan Jiang City Belt showed an increasing trend from 2000 to 2013.Significant difference of NPP was found in different land use types,forest land＞grassland ＞ cultivated land ＞ construction land ＞unused land ＞water.There is a decrease trend from the south to the northwest of annually average NPP.The increase and decrease region of the annual variation of NPP with the range of plus or minus 10 gC·m-2·a-1.Temperature is the main climate factor which affecting the temporal-spatial distribution and evolution of vegetation NPP in the study area.