摘要
在12块标准地拍摄642张数码照片,分大、中、小3种视角测定了华北落叶松林分的郁闭度。结果表明:利用数码照片测定林分郁闭度是可行的,并具有较高的精确度。与抬头望法相比,当郁闭度较小时,利用数码照片测定的郁闭度偏大;而当郁闭度中等或较大时,测定结果相近或偏小。大视角数码照片比小视角数码照片的测定结果偏大,并具有较小的标准差,精确度较高。
A total of 642 digital photos were acquired at 12 sample plots of Larix principis-rupprechtii,and canopy closure was measured from wide,medium and narrow visual angles respectively.Results showed that measurement of canopy closure by digital photos was feasible and precise.The canopy closure estimated by digital photos was higher than that by ocular estimate when the canopy closure was lower,while the measured value was close or lower when the canopy closure was at medium or high levels.The measured value by the digital photos with wide visual angle was precise and had a small standard deviation,which was higher than that of the digital photos with narrow visual angle.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2010年第11期34-37,共4页
Journal of Northeast Forestry University
基金
科技部"十一五"科技支撑项目(2006BAD23B0203-1)
关键词
郁闭度
数码照片
精确度
抬头望法
Canopy closure
Digital photos
Precision
Ocular estimate
