西北林学院学报2018，Vol.33Issue(1)：225-232,8.DOI:10.3969/j.issn.1001-7461.2018.01.37
基于Landsat OLI和ETM+的杭州城市绿地地上生物量估算比较研究
Estimation of Above-ground Biomass of Urban Green Land in Hangzhou Based on Landsat OLI and ETM+ Data
摘要
Abstract
Quantitative estimation of the biomass of urban green space system is of significance to study of urban carbon cycle.In this paper,Landsat 8OLI was selected to extract the original band and vegetation index information.Based on the measured data of 199 samples,a model for estimating the above ground biomass of the vegetations occurring in Hangzhou urban green land was established to invert of biomass in the study area.The results of the estimation was compared with those obtained from Landsat 7 ETM+ in corresponding perios.The coefficients of determination (R2) of step-wise regression and random forests based on Landsat8OLI were 0.643 and 0.514,respectively.Urban green space biomass mainly focused in the 5-15 t · hm-2,35-55 t · hm-2.In urban area,the green spaces were in strip and block distributions,with low biomass.the biomass of the public welfare forests in middle area pine forests in suburb exhibited was high.The mean above-ground biomass was 32.520 t · hm-2 by the estimation results based on OLI,while for the results of ETM+ image was 34.545 t · hm-2.The differences between the two results was basically centered around 0 as the center,and the average value of the difference was-1.934 t · hm-2.The Pearson correlation between the two images was 0.901,significance was less than 0.001.Generally,the biomass estimation results of the two images had little difference,which could be supplemented by the linear relationship.关键词
OLI/ETM+/生物量/逐步回归/随机森林Key words
OLI/ETM+/biomass/step-wise regression/random forest分类
农业科技引用本文复制引用
邱布布,徐丽华,张茂震,张结存,钱军朝,陆张维..基于Landsat OLI和ETM+的杭州城市绿地地上生物量估算比较研究[J].西北林学院学报,2018,33(1):225-232,8.基金项目
国家自然科学基金(E080201) （E080201）
浙江省自然科学基金(LY15D010006). （LY15D010006）
