摘要
基于MODIS NDVI数据产品、地面气象站数据和解译的土地利用数据,利用改进的CASA模型,估算了疏勒河流域2001、2005、2009和2012年的植被净初级生产力(NPP),并分析了其时空变化。结果表明,1流域单位面积上的年平均NPP仅为95.2 g(C)/(m2·a),足见流域整体生产力水平较低;2NPP的空间分布呈自东南向西北递减的趋势,且具有显著的经向"双峰"特征;3构成主要植被覆盖类型的荒漠灌木、半灌木植被对NPP贡献率最大;4流域年际NPP总量呈波动式增加,2012年较2001年增加了50%;5NPP的空间变化可划"明显增加"、"轻微增加"、"几乎不变"和"轻微减少"4个类型,其中增加的区域占78.9%,其反映了区域生态环境总体上在向好的方向发展。
Abstract Based on MODIS NDVI data products, ground meteorological data and land use data, the vegetation net primary productivity （NPP） of 2001, 2005, 2009 and 2012 years were estimated through the improved CASA model. The spatial-temporal distribution and variation characteristics of NPP from 2001 to 2012 were analyzed. The results show that： （1） The average annual NPP is 95.2 g（ C ）/（ m^2· a）, which shows the overall low level of productivity ; （2） The distribution of the NPP has the trends of decreasing from southeast to northwest, and presents significant ＂double peak ＂ feature ; （3） Desert shrub, half-shrub vegetation which has a maximum contribution of total NPP is the major vegetation type in the Shule River Basin; （4） The total annual NPP appeared fluctuated increasing from 2001 to 2012, the total NPP in 2012 is increased by 50% in comparison with 2001; （5） The NPP spatial variation is divided into four tapes： significantly increased, a slight increase, almost unchanged, and a slight decrease; the NPP increase area occupied the whole area with 78.9%, this change character of NPP reflects the positive trend towards the development of regional ecological environment.
出处
《安徽农业科学》
CAS
2015年第25期227-230,273,共5页
Journal of Anhui Agricultural Sciences
基金
国家自然科学基金项目(41471163)
兰州大学中央高校基本科研业务费专项(lzujbky-2013-m02)
国家基础科学人才培养基金科研训练及科研能力提高项目(J1210065)
国家科技支撑计划项目(2012BAC19B09)
关键词
疏勒河流域
改进的CASA模型
时空变化
Shule River Basin
NPP
Improved CASA model
Temporal-spatial process change
