摘要
林分空间结构是影响林木生长过程、森林生态系统结构和功能的重要因素,研究毛竹扩张杉木林的空间结构变化规律,对毛竹扩张防控及精准经营具有重要意义。以天宝岩自然保护区的毛竹-杉木混交界面为研究对象,设置不同扩张程度,基于无人机遥感影像,实现林分单木位置提取及毛竹和杉木识别;结合Voronoi图,获取林分空间结构相关参数,构建林分空间结构评价指数,揭示毛竹向杉木林扩张不同程度林分空间结构变化特征。结果表明,林分平均角尺度、混交度、大小比数和林分空间结构评价指数分别为0.50~0.55、0.48~0.51、0.25~0.55、0.20~0.50,且随扩张程度的加深,均表现为先增后减的趋势,在毛竹和杉木数量占比接近1∶1时,空间结构评价指数达到最大值,林分空间结构整体最优。研究所构建的林分空间结构评价指数,可以有效地反映林分空间结构的整体状况,为揭示毛竹扩张杉木林演化机制提供基础数据。
The spatial structure of stand is an important factor affecting the growth process of trees and the structure and function of forest ecosystem.It is of great significance to study the changes of spatial structure of Phyllostachys edulis and Cunninghamia lanceolata forests for the prevention and control of P.edulis expansion and accurate management.Therefore,the mixed interface of P.edulis and C.lanceolata in the Tianbaoyan Nature Reserve was selected as the research objecthe location of individual trees in the stand was extractedhe identification of P.edulis and C.lanceolata was realized based on unmanned aerial vehicle(UAV)remote sensing images.Based on Voronoi diagram,the parameters related to stand spatial structure were obtained,and the comprehensive index of stand spatial structure was constructed to reveal the change characteristics of stand spatial structure in different degrees of P.edulis expansion to C.lanceolata.The results showed that the stand average angle scale,mixing degree,size ratio and stand spatial structure evaluation index were 0.50-0.55,0.48-0.51,0.25-0.55 and 0.20-0.50,respectively,and all showed a trend of increasing first and then decreasing with the expansion degree.When the proportion of P.edulis and C.lanceolata was close to 1∶1,the spatial structure evaluation index reached the maximum value,and the overall spatial structure of the stand was optimal.The evaluation index of stand spatial structure constructed in this study can effectively reflect the overall status of stand spatial structure,and provides basic data for revealing the evolution mechanism of P.edulis and C.lanceolata forests.
作者
陆雪婷
曹碧凤
杨樟平
严夏帆
宋贤芬
余坤勇
刘健
LU Xue-ting;CAO Bi-feng;YANG Zhang-ping;YAN Xia-fan;SONG Xian-fen;YU Kun-yong;LIU Jian(College of Forestry,Fujian Agriculture and Forestry University,Fuzhou 350002,Fujian,China;University Key Lab for Geomatics Technology&Optimize Resource Utilization in Fujian Province,Fuzhou 350002,Fujian,China;Yong'an Forestry Bureau,Yong'an 366038,Fujian,China)
出处
《西北林学院学报》
CSCD
北大核心
2023年第5期184-193,共10页
Journal of Northwest Forestry University
基金
高校产学合作项目(2020N5003)
福建省高校重点实验室建设(KJG20104A)。
关键词
毛竹扩张
空间结构
单木提取
无人机遥感
VORONOI图
Phyllostachys edulis expansion
spatial structure
single wood extraction
UAV remote sensing
Voronoi diagram
