地形和采样数量对浙江省森林凋落物碳密度插值精度的影响  

Effects of topographical condition and sampling number on the interpolation precision of forest litter carbon density

作　　者：张佳佳[1,2] 傅伟军[1,2] 杜群[3] 张国江[3] 姜培坤[1,2] 

机构地区：[1]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,浙江临安311300 [2]浙江农林大学环境与资源学院,浙江临安311300 [3]浙江省森林资源监测中心,浙江杭州311300

出　　处：《应用生态学报》2013年第8期2241-2247,共7页Chinese Journal of Applied Ecology

基　　金：浙江省重点科技创新团队项目(2010R50030);浙江省林业厅项目(20452000127)资助

摘　　要：将浙江省分成平原沿海地区、丘陵-盆地和山地3个地形单元,研究地形和采样数量对浙江省森林凋落物碳密度克里格插值精度的影响.结果表明:浙江省平原沿海地区、丘陵-盆地和山地的森林凋落物碳密度半变异函数基台效应在28.3%～72.4%之间,具有中等空间相关性;不同地形的克里格插值精度高低顺序为平原沿海地区>丘陵-盆地>山地,随着地形复杂程度增加,其插值精度降低;同一地形单元内的克里格插值精度随采样数量增加而提高,以山地的插值精度提高最为明显.在地形复杂区域有必要设置较多的采样点以提高插值的精度.The territory of Zhejiang Province, East China was grouped into 3 topographical units （plain-coastal area, hill-basin area, and mountain area） to investigate the effects of topographical condition and sampling number on the Kriging interpolation precision of forest litter carbon density in the Province. The forest litter carbon density in the 3 topographical units showed a medium spatial correlation pattern, with the semi-variance nugget/sill ratio value ranged from 28.3% to 72.4%. The Kriging interpolation precision was in the order of plain-coastal area hill-basin area mountain area, indicating that the Kriging interpolation precision decreased with the increase of terrain complexity degree. Within the same topographical units, the Kriging interpolation precision improved with increasing sampling number, being most obvious in the mountain area. Therefore, under complicated topographical conditions, greater sampling number was required to achieve a high precision of Kriging interpolation.

关 键 词：地形 采样数量 森林凋落物碳密度 克里格插值精度 浙江省 

分 类 号：S714[农业科学—林学]