基于CASA模型的皖江城市带植被净初级生产力时空变化特征研究  

Research on Space-Time Variety Characteristics of Vegetation Net Primary Productivity Based on the CASA Model in Wan Jiang City Belt

作　　者：谷家川[1] 彭丰[1] 沈非[2] 赵来[1] 查良松[2] 王汝幸[3] 

机构地区：[1]滁州学院地理信息与旅游学院,安徽滁州239000 [2]安徽师范大学国土资源与旅游学院,安徽芜湖241003 [3]北京师范大学减灾与应急管理研究院,北京100875

出　　处：《安徽师范大学学报（自然科学版）》2014年第4期371-377,共7页Journal of Anhui Normal University(Natural Science)

基　　金：国家自然科学基金(41271545);安徽省软科学项目(11020503071);安徽师范大学自然科学培育基金(2013xmpy12)

摘　　要：运用GIS和RS技术,利用植被、气候和辐射等地面空间数据,基于CASA模型估算2001-2010年之间皖江城市带植被净初级生产力(NPP),并分析其时空变化特征.结果表明:10年之间皖江城市带植被净初级生产力呈减少趋势,其中NPPMAX年均减少速度5.3gC/m2·a,NPPMEAN年均减少率0.513%;10年NPPMAX均值为805.09gC/m2·a,NPPMEAN均值为463.26gC/m2·a;净初级生产力年累计量变化幅度较大,约在30.052-43.483TgC/a之间;年际变化十分明显,最大值出现在2008年,为43.483TgC,最小值在2006年,为30.052TgC,年均减少率0.51%.植被净初级生产力空间格局表现出较大的不均匀性,整体分布状况是以长江为界,长江以南植被净初级生产力较大,但有逐渐变小趋势;长江以北植被净初级生产力较小,却表现出逐渐增加的趋势.The net primary production （NPP） of Wan Jiang City Belt vegetation during 2001-2010 was estimated,and its spatial-temporal patterns were explored,based on the CASA （Carnegie-Ames-Stanford Approach） model and using remote sensing imagery and GIS technology and land spatial data of vegetation,climate,soil and solar radiation.As results,terrestrial NPP in Wan Jiang City Belt indicated a significant reduction over the past 10 years,with a mean reducing rate of 5.3gC/m2·a of NPPMAX and a mean reducing rate of 0.513％ of NPPMEAN and an average NPPMAX value of 805.09gC/m2 ·a and an average NPPMEAN value of 463.26gC/m2· a.the average annual total NPP was about 36.77 TgC/a,NPP exhibited an reducing trend during the study period by 0.51％/a and the average annual total NPPMAX value of 43.483TGC in 2008and the average annual total NPPMIN value of 30.052TgC.Vegetation NPP heterogeneous spatial pattern and spatial changes were less obvious,the overall distribution trend was based on the Yangtze river,the vegetation NPP was bigger in south of the Yangtze river,but showed a trend of decrease gradually; the vegetation NPP was lesser in north of the Yangtze river,but showed a trend of increase gradually.

关 键 词：CASA模型 时空变化 净初级生产力 植被指数 植被 皖江城市带 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置] Q948.11[自动化与计算机技术—控制科学与工程]