摘要
叶面积指数(LAI),它是表征植被冠层结构的最基本参量之一,它影响着植被许多生理和物理过程,如光合、呼吸和蒸腾作用,以及碳循环和降水截留等。应用2003年遥感影像数据对合肥市城市绿量进行推算,采用植被指数作为统计模型的自变量,建立不同植被类型叶面积指数(LAI)与归一化植被指数(NDVI)的回归模型,探讨叶面积指数与归一化植被指数之间的相关性。结果表明,不同植被类型的LAI与NDVI的关系均可用逻辑斯蒂方程表达;不同植被类型的叶面积指数城市森林0.97>农田0.62>一般绿地0.61,合肥市总绿量2.9×108m2,植被分布区单位面积绿量2.2,不同类型对绿量的贡献率与其占有的土地面积比例不完全相符,应探求建立合理的绿化复层种植结构的具体方法,增加城市绿地的LAI。本研究也可用于研究周边地区相似植被的绿量。
LAI（leaf area index）,as one of the basic parameters of vegetation canopy structure,has an effect on vegetation physiological and physical processes such as photosynthesis,respiration and transpiration,carbon cycle and rainfall interception.Based on the data attained by remote sensing image in 2003,the article calculated urban green quantity in Hefei and built a regression model including LAI and NDVI（normal differential vegetation index） variables referring to differential vegetation in order to analyze their correlation.The results showed that the logistic model was applicable to LAI and NDVI of differential vegetation;forestry LAI among differential vegetation was highest,0.97,farmland LAI was lower,0.62,and the general green field was lowest,0.6;the green quantity in Hefei totaled 2.9×108 square meters and the green quantity per square meters in vegetation area was 2.2;the greenness contribution rates of differential vegetation were not accorded with their area composition percentages;the relevant researchers should try to rationally devise a specific greening method of multi-layer planting structure to increase LAI.The article may provide references for the research on green quantity of similar vegetation in neighborhood regions.
出处
《安徽农业大学学报》
CAS
CSCD
北大核心
2010年第2期306-311,共6页
Journal of Anhui Agricultural University
基金
国家"十一五"科技支撑项目(2006BAD03A06)资助
