首页关于本刊影响因子及获奖投稿须知订阅及广告专辑与专题学术会议绿色发表通道优秀论文 
王宝琦,刘志理,戚玉娇,金光泽.利用不同方法测定红松人工林叶面积指数的季节动态.生态学报,2014,34(8):1956~1964 本文二维码信息
二维码(扫一下试试看!)
利用不同方法测定红松人工林叶面积指数的季节动态
Seasonal dynamics of leaf area index using different methods in the Korean pine plantation
投稿时间:2013-06-18  修订日期:2013-12-26
DOI: 10.5846/stxb201306181727
关键词小兴安岭  叶面积指数  展叶调查  光学仪器法  凋落物法  异速生长方程法  季节动态
Key WordsXiaoxing’an Mountains  leaf area index  leaf seasonality observation  optical method  litterfall method  allometry method  seasonal dynamics
基金项目林业公益性行业科研专项资助项目(201204320);长江学者和创新团队发展计划资助(IRT1054)
作者单位E-mail
王宝琦 东北林业大学生态研究中心, 哈尔滨 150040  
刘志理 东北林业大学生态研究中心, 哈尔滨 150040  
戚玉娇 东北林业大学林学院, 哈尔滨 150040  
金光泽 东北林业大学生态研究中心, 哈尔滨 150040 taxus@126.com 
摘要点击次数 1069
全文下载次数 752
摘要:
采用2种异速生长方程法、凋落物法、综合法(对光学仪器法进行木质部分及集聚效应校正后结合凋落物法)和光学仪器法测定了小兴安岭红松(Pinus koraiensis)人工林的叶面积指数(LAI)。首先利用光学仪器法测定有效叶面积指数(Le)的季节动态;其次为获得相对准确LAI,基于生长季节(5-8月)的展叶调查,结合凋落物法、综合法和2种异速生长方程法分别测定LAI的季节动态。结果表明:生长季节红松叶片8月初停止生长,迟于其他树种约两周;不同方法测定红松人工林LAI的季节变化均呈单峰型,且在8月初达到峰值,分别为异速生长方法-B(10.58) > 凋落物法(7.90) > 异速生长方法-A(6.70) > 综合法(4.41) > 光学仪器法(1.81);在整个调查期内(5月至11月),相对于异速生长方法-B、凋落物法、异速生长方法-A和综合法,光学仪器法分别平均低估81.69%、75.50%、70.18%和48.90%。本研究探讨了非破坏条件下测定红松人工林LAI季节动态的直接方法,并比较了不同方法之间的差异,研究结果可为有效测定常绿针叶林LAI提供参考。
Abstract:
Leaf area index (LAI), defined as half the total leaf area per unit ground surface area, and is one of the most important characteristics of the plant canopy structure. LAI controls the flux of carbon, solar energy, and water in forest ecosystems. Thus, accurately estimating LAI is essential for simulating the forest process. Furthermore, the seasonality of LAI estimation is of particular interest. Methods directly estimating LAI mainly include destructive sampling, allometry, and litterfall. The results of these methods are assumed to provide values close to the true LAI. However, the first two methods destroy the samples, as well as labor intensive. By contrast, the litterfall method is the best choice in obtaining accurate LAI. At present, the optical method has been widely used to estimate LAI because of its convenience and speed. However, the accuracy of optically measured LAI needs to be verified. This verification is performed because the indirect method often underestimates LAI. In the present study, allometry method (including two different allometry equations, namely, A and B), litterfall method, combinational method (the LAI derived from optical method were calibrated by taking into consideration the woody-to-total ratio (α), as well as the clumping index, and combining the litterfall method), and optical method were used to estimate LAI in the Korean pine (Pinus koraiensis) plantation in Xiaoxing'an Mountains. First, we estimated the effective leaf area index (Le) and its seasonality in the Korean pine plantation using optical method (hemispherical photography). To obtain accurate LAI, we estimated the LAI seasonal dynamics by combining litterfall method, combinational method, and allometry methods in accordance with the leaf seasonality observation from May to August. Subsequently, we compared the results obtained from the different methods. The results showed that P. koraiensis leaf stopped growing in early August, which was approximately two weeks later than the other tree species. The major species had different leaf fall pattern in the Korean pine plantation. P. koraiensis had two rapidly decreasing flush. The first flush was in June. The second was in late September. However, other species had single rapidly decreasing flush in late September. The LAI seasonal dynamic derived from different methods all show a uni-modal pattern with a peak in early August, with the following order: Allometry-B method (10.58) > Litterfall method (7.90) > Allometry-A method (6.70) > Combinational method (4.41) > Optical method (1.81). In the entire study period (from May to November), the LAI derived from optical method underestimated LAI by an average of 81.69%, 75.50%, 70.18%, and 48.90%, respectively, which were in contrast with contrast Allometry-B method, Litterfall method, Allometry-A method, and Combinational method. In the present study, we investigated a practical method for estimating LAI in the Korean pine plantation using a non-destructive method. Furthermore, we compared the difference between the different methods. In addition, this study lays a foundation for the valid LAI estimation of evergreen conifer forest in subsequent studies.
HTML 查看全文   查看/发表评论  下载PDF阅读器

您是本站第 67403648 位访问者

Copyright © 2005-2019   京ICP备06018880号
地址:北京海淀区双清路18号
  邮编:100085    电话:010-62941099
  E-mail : shengtaixuebao@rcees.ac.cn
本系统由北京勤云科技发展有限公司提供技术支持