样本分层对毛竹林地上部分碳储量估算精度的影响  

Effects of Sample Plots Stratification on Estimation Accuracy of Aboveground Carbon Storage for Phyllostachys edulis Forests

作　　者：徐小军[1] 周国模[1,2] 杜华强[2] 周宇峰[2] 胡军国[2] 陆国富[2] 

机构地区：[1]北京林业大学林学院,北京100083 [2]浙江农林大学浙江省森林生态系统碳循环与固碳减排重点实验室,临安311300

出　　处：《林业科学》2013年第6期18-24,共7页Scientia Silvae Sinicae

基　　金：国家自然科学基金项目(31070564);科技部973课题(2011CB302705);浙江省自然科学基金项目(Y3100427);浙江省林业碳汇与计量创新团队项目(2010R50030)

摘　　要：结合Landsat TM影像和毛竹林样地调查数据,分别采用原始样本及基于太阳入射角余弦值cos(β)分层后样本建立多元线性回归模型估算安吉县毛竹林地上部分碳储量,并对利用这2种不同样本集所建模型的精度作比较。结果表明:通过cos(β)对样本分层能够降低样本点离散程度,提高遥感因子与毛竹林地上部分碳储量相关性;采用cos(β)分层后样本集所建的模型拟合(RMSE=4.07 MgC·hm-2)和预测精度(RMSE=4.63 MgC·hm-2)都高于基于原始样本集所建的模型;样本分层能够显著改善高和低水平地上部分碳储量精度。本研究提出的样本分层方法还需应用于不同影像及森林类型作进一步验证。Based on a combined use of landsat thematic mapper （TM） and field measurements, original plots and stratified plots according to cosine of incidence angle, which can represent correlation of terrain and sun light, were respectively used for variables of muhiple regression models to estimate the aboveground carbon storage of moso bamboo （ Phyllostachys edulis） forest. Results showed that ： dispersion degree of sample plots decreased and correlation coefficients between remote sensing variables and aboveground carbon storage increased through stratified sample plots; The fitting （RMSE =4.07 MgC. hm-5） and predicted （ RMSE = 4.63 MgC · hm-2 ） accuracy of model with stratified sample plots were high than that of model with original samples; the improvement was of statistical significance for those high and low aboveground carbon storage value based on stratified plots strategy. The stratified sample plots method provided in this study is still needed to be tested with different images and forest types in future studies.

关 键 词：毛竹林 地上部分碳储量 太阳入射角余弦值 样本分层 

分 类 号：S758.5[农业科学—森林经理学]