| 基于LiDAR的亚热带次生林林窗对幼树更新影响分析 |
| |
| 引用本文： | 刘峰,谭畅,王红,龙江平.基于LiDAR的亚热带次生林林窗对幼树更新影响分析[J].农业机械学报,2017,48(3):198-204. |
| |
| 作者姓名： | 刘峰 谭畅 王红 龙江平 |
| |
| 作者单位： | 中南林业科技大学,中南林业科技大学,中南林业科技大学,中南林业科技大学 |
| |
| 基金项目： | 湖南省自然科学基金面上项目（2015JJ2201）、湖南省教育厅科学研究项目（13B153、14C1182）和中南林业科技大学人才引进科研启动基金项目 |
| |
| 摘 要： | 以湖南亚热带次生林为研究对象,利用多时相机载激光雷达(Light detection and ranging,Li DAR)和野外调查数据对林窗及幼树进行监测,分析比较林窗对幼树密度分布和树高生长变化的影响。结果表明,林窗大小和位置对幼树密度分布都有显著影响,喜光树种幼树主要集中在小林窗的中心区或大林窗的过渡区,在大林窗中密度最大(647株/hm2),耐荫树种幼树主要集中在林窗的边缘区,在中等林窗中密度最大(941株/hm~2)。林窗大小对幼树树高生长有显著影响,喜光树种和耐荫树种幼树分别在大林窗和中等林窗中树高生长量最大(69.3 cm/a、57.7 cm/a),喜光树种幼树在中心区的树高生长量明显大于其他位置,耐荫树种幼树的树高生长量在位置上的差异不显著。线性混合模型分析显示林窗大小是促进幼树树高生长的最主要因素,幼树树高生长变化在不同林窗中呈聚集性。从幼树密度树高生长情况来看,50~150 m~2林窗较适合促进亚热带次生林的群落演替。
|
| 关 键 词： | 林窗 激光雷达 幼树 密度 树高生长 |
| 收稿时间： | 2016/8/1 0:00:00 |
Effect of Canopy Gap on Subtropical Secondary Forest Sapling Regeneration Based on LiDAR |
| |
| LIU Feng,TAN Chang,WANG Hong and LONG Jiangping.Effect of Canopy Gap on Subtropical Secondary Forest Sapling Regeneration Based on LiDAR[J].Transactions of the Chinese Society of Agricultural Machinery,2017,48(3):198-204. |
| |
| Authors: | LIU Feng TAN Chang WANG Hong and LONG Jiangping |
| |
| Institution: | Central South University of Forestry and Technology,Central South University of Forestry and Technology,Central South University of Forestry and Technology and Central South University of Forestry and Technology |
| |
| Abstract: | Canopy gaps are small-scale openings in forest canopies which offer suitable micro-climatic conditions for tree regeneration. The subtropical secondary forest in Hunan Province was focused, and multi-temporal light detection and ranging (LiDAR) and survey data were adopted to analyze effects of different canopy gaps on sapling density and height growth. The results showed that both size of gap and position within gap significantly affected sapling density distribution. Shade intolerant sapling was mainly distributed in central zones of small-sized gap and transition zones of large-sized gap, in which the density got the maximum (647 trees/hm2). Shade tolerant sapling was usually appeared in edge zones of gaps, and the maximum density (941 trees/hm2) was occurred in medium-sized gap. The size of gap significantly affected sapling height growth, shade intolerant and shade tolerant sapling had the greatest growth rate of 69.3cm/a and 57.7cm/a in large-sized and medium-sized gaps, respectively. Height growth of shade intolerant sapling in central zones was significantly higher than those in other zones, while shade tolerant sapling height growth was irrespective of their position within the gap. Results of mixed linear model suggested that size of gap had the main effect on sapling height growth, which exhibited aggregation among different levels of gaps. The higher density and more rapid height growth rate were got in the gap with size of 50~150m2, which could be the optimal gap size for facilitating community succession of subtropical secondary forest. |
| |
| Keywords: | canopy gap LiDAR sapling density height growth |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《农业机械学报》浏览原始摘要信息 |
| 点击此处可从《农业机械学报》下载免费的PDF全文 |
|
