文献类型：期刊文献

英文题名：Composition of basal area in natural forests based on the uniform angle index

作者：Zhang Gongqiao[1] Hui Gangying[1] Zhao Zhonghua[1] Hu Yanbo[1] Wang Hongxiang[1] Liu Wenzhen[2] Zang Runguo[3]

第一作者：张弓乔

通信作者：Hui, GY[1]

机构：[1]Chinese Acad Forestry, State Forestry Adm, Res Inst Forestry, Key Lab Tree Breeding & Cultivat, Beijing 100091, Peoples R China;[2]Xiaolongshan Res Inst Forestry Gansu, Tianshui 741020, Gansu, Peoples R China;[3]Chinese Acad Forestry, Inst Forest Ecol Environm & Protect, Beijing 100091, Peoples R China

年份：2018

卷号：45

起止页码：1-8

外文期刊名：ECOLOGICAL INFORMATICS

收录：;Scopus(收录号：2-s2.0-85042939339);WOS:【SCI-EXPANDED(收录号:WOS:000433654000001)】；

基金：We gratefully acknowledge Zhang Jiacheng and Ding Yi from the Forest Ecological Environment and Protection Research Institute, Chinese Academy of Forestry. They provided the Picea schrenkiana natural forest data from Xinjiang Province. We would also like to thank Liu Ling, Wang Qianxue, and Zhang Jili from the Cold Temperate Forest Research Center, Chinese Academy of Forestry. They took part in the investigation in Jilin Province. Finally, we are grateful for the financial support offered by the National Key Research and Development Program of China (2016YFD0600203). We would like to thank all of the reviewers and editors for reading the manuscript and providing useful feedback.

语种：英文

外文关键词：Natural forest; Stand spatial structure; Uniform angle index; Random distribution; Basal area; Plantation cultivation

摘要：This study presents an analysis of the small scale spatial patterns in natural forest plots in different parts of China. The focus of the analysis is to assess the spatial characteristics of different natural forests at a high level of resolution. The results may provide a theoretical basis for nature-approximating forest management practices in plantations established with a regular arrangement of planting points. Method: Using a new measure for describing small scale forest structures, known as the Uniform Angle Index, it was possible to identify local structure units as even, random, or clustered. We analysed 11 selected natural forest plots with mapped trees with a wide geographical distribution in different regions of China. In each plot, with a known basal area density, the proportion of the total basal area was assessed that can be assigned to local structure units with specific patterns. Specifically, the basal area of each tree, and the associated local spatial pattern in the vicinity of that tree, provided the information about the distribution of local spatial patterns in the 11 natural forests. Results: (1) Most trees were distributed in neighbourhoods with a random structure, regardless of whether the entire forest pattern was classified as even, random, or clustered. Less than half of the tree neighbourhoods were either clustered or evenly structured. (2) More than 50% of the basal area of the reference trees consisted of random units in all 11 natural forests. (3) Similarly, the basal areas of the random structure units occupied more than half of the total basal area. Conclusions: Our findings suggest that the major part of the basal area natural forests consists of random structure units. This observation may be helpful in the design of planting patterns or harvesting schedules to improve the stability of planted monocultures.