100倍圆法和角规测定林分株数密度的性能对比分析  

Performance comparison of measuring stem density of forest stand between the 100 times circle method and the angle gauge

作　　者：刘明星 鄢前飞[2] 李明诗 LIU Mingxing;YAN Qianfei;LI Mingshi(College of Forestry,Nanjing Forestry University,Nanjing 210037,Jiangsu,China;College of Forestry Central South University of Forestry and Technology,Changsha 410004,Hunan,China;Co-Innovation Center for Sustainable Forestry in Southern China,Nanjing 210037,Jiangsu,China)

机构地区：[1]南京林业大学林学院,江苏南京210037 [2]中南林业科技大学林学院,湖南长沙410004 [3]南方现代林业协同创新中心,江苏南京210037

出　　处：《中南林业科技大学学报》2019年第11期23-28,共6页Journal of Central South University of Forestry & Technology

基　　金：国家自然科学基金项目（31670552）;江苏省高校优势学科建设项目（PAPD）;江苏省高校青蓝工程项目（2017）

摘　　要：林分平均直径100倍圆法在测定林分每公顷胸高断面积的同时,还能测定林分每公顷株数。100倍圆法测定每公顷株数与角规相比较而言,两者的精度如何,两者测定每公顷株数可靠性如何,能否反应林分直径分布规律等都有待验证和评价。对12块马尾松人工林与杉木人工林样地进行了典型抽样调查,通过内业分析发现100倍圆法测定每公顷株数的平均精度为92.28%,角规测定每公顷株数的平均精度为86.23%,100倍圆法测定每公顷株数的平均精度高于角规约6个百分点。同时,100倍圆法野外测量效率更高一些,也更能反应林分直径分布结构分布规律的特点。此方法是理论到实践的首次应用,可使今后的测树工作更加精准方便。The 100 times circle method measures not only forest's basal area of breast-height per hectare, but also number of trees per hectare. In combination with angle gauge method, the measurement accuracy, reliability, capability of reflecting the diameter distribution law need to be verified and evaluated. Specifically, twelve representative Masson pine and Chinese fir sample plots were inventoried by using the 100 times circle method and the angle gauge method. After an intensive interior analysis, it was revealed that the average measurement accuracy derived from the 100 times circle method was estimated at 92.28% for number of trees per hectare while the angle gauge method gained an accuracy estimate of 86.23%, further, a more logical diameter distribution law was derived from measurements of the 100 times circle method in relative to the angle gauge method. Additionally, 100 times circle method was slightly efficient in the field measurement than angle gauge method. In conclusion, the 100 times circle method is applied for the first time from theory to practice, enabling forest measurement work more precise and convenient.

关 键 词：100倍圆法 胸高断面积 每公顷株数 标准地 角规 精度 

分 类 号：S758.58[农业科学—森林经理学]