中国农业气象 ›› 2014, Vol. 35 ›› Issue (04): 373-379.doi: 10.3969/j.issn.1000-6362.2014.04.003

• 论文 • 上一篇    下一篇

植物冠层分析仪测定荆条孤立冠层叶面积指数和透光率的分析

陈景玲,王静,王谦,贾长荣,寇渊博   

  1. 河南农业大学,郑州450002;河南省济源市大沟河林场,济源454000
  • 收稿日期:2013-12-28 出版日期:2014-08-20 发布日期:2015-02-11
  • 作者简介:陈景玲(1964-),女,河南洛阳人,副教授,学士,主要从事植物生态研究。 Email: chenjingling5@163.com
  • 基金资助:

    国家自然科学基金“基于气候空间上限列线的栓皮栎幼苗高温叠加干旱胁迫机制研究”(31370621);“番茄叶片低温胁迫气象指标的气候空间列线研究”(31071321)

LAI and Light Transmittance Measurement of Isolated Vitex Shrub Using LAI2200 PCA

CHEN Jing ling,WANG Jing,WANG Qian,JIA Chang rong,KOU Yuan bo   

  1. Henan Agricultural University,Zhengzhou450002,China;Dagouhe Forest Farm of Jiyuan City Henan Province,Jiyuan454000
  • Received:2013-12-28 Online:2014-08-20 Published:2015-02-11

摘要: 利用LAI2200植物冠层分析仪(PCA)无损测定分析8株荆条(Vitex negundo L.)冠层叶面积指数LAIPCA(3.5~6.5)和天空开度(DIFN),通过LI200SA传感器同步测定相应的光强透射率τ;同时利用收获法实测荆条冠层叶面积指数LAI收获法,对比分析LAIPCA与LAI收获法、DIFN与τ的相关性和偏差。结果表明:(1)两种方法所测叶面积指数相关极显著(P<0.01);LAIPCA比LAI收获法平均偏高2.57%,表明LAI2200用于荆条灌丛冠层叶面积指数LAI的测定结果偏差较小。(2)LAI2200PCA测定DIFN与辐射传感器测定冠层透光率τ相关极显著(P<0.01),说明LAI2200 PCA可以替代收获法无损测定荆条孤立灌丛冠层叶面积指数和透光率。本文实现了用冠层分析仪对植物孤立冠层的分析,为林业生产和研究中较为普遍存在的孤立植物冠层下光照分析和叶面积指数测定提供了简便方法。

关键词: 孤立冠层, 冠层分析, LAI2200, 天空开度, 透光率

Abstract: Using the Plant Canopy Analyzer(PCA),authors nondestructively measured the leaf area index (LAIPCA)and diffuse noneinterceptance(DIFN) of 8 isolated Vitex negundo L. canopies. The light transmittance(τ)was measuredusing LI200SA sensor and LAIharvest of the 8 canopies was measured using harvesting method(total defoliation).Then the correlation and deviation of LAIPCA and LAIharvest,also DIFN and τ, were compared. The results showed that (1)LAIPCA measured by LAI2200 PCA was closely related to LAIharvest obtained with the harvesting method,passed through the significant test at 0.01 reliability. LAIPCA measured by LAI2200 PCA was 2.57% higher than that obtained  with the harvesting method (total defoliation),which indicated that LAI2200 had small deviation when used to measure LAI of isolated forest canopy.(2)DIFN measured by LAI2200 PCA closely related to the light transmittance(τ)measured by LI200SA sensor(P<0.01). It indicated that LAI2200 PCA can be used to measure vitex shrub isolated canopy LAI and light transmittance replacing total defoliation method. The paper demonstrated isolated forest canopy analyzing method,which widely presents in the practice of forestry production.

Key words: Isolated canopy, Canopy analyzing, LAI2200, DIFN, Transmittance