楸树叶面积指数的测度及冠层空隙度的季节动态

贠慧玲; 王军辉; 赵秋玲; 李银梅

doi:10.3969/j.issn.1000-2006.2013.02.011

贠慧玲,王军辉,赵秋玲,李银梅

南京林业大学学报（自然科学版） ›› 2013, Vol. 37 ›› Issue (02) : 59-64.

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南京林业大学学报（自然科学版） ›› 2013, Vol. 37 ›› Issue (02) : 59-64. DOI: 10.3969/j.issn.1000-2006.2013.02.011

研究论文

楸树叶面积指数的测度及冠层空隙度的季节动态

贠慧玲¹,王军辉^2*,赵秋玲¹,李银梅¹

作者信息 +

Seasonal variability in leaf area index and canopy gap fraction of Catalpa bungei

YUN Huiling¹,WANG Junhui^2*, ZHAO Qiuling¹, LI Yinmei¹

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文章历史 +

摘要

应用 LAI-2000植物冠层分析仪,测定了楸树叶面积指数(LAI)和冠层空隙度的季节动态。结果表明:29个楸树无性系叶面积指数均呈现出明显的季节性变化,变化总趋势均呈先上升再下降的单峰曲线,峰值出现在9月,无性系间叶面积指数呈极显著的差异; 楸树冠层空隙度也呈现明显的季节性,变化总趋势呈现先下降再上升的单峰曲线,最低峰值出现在9月。楸树是喜平型冠层,叶倾角的季节变化不大,均在一定范围内波动。楸树冠层均匀性差异较大,生长较好的无性系冠层均匀性较好,生长较差的无性系冠层均匀性较差。分析发现,楸树叶面积指数和冠层空隙度相关极显著,并且呈指数回归的关系(R²>0.980),回归式为:y=ae^-bx。

Abstract

The seasonal dynamics of the leaf area index(LAI)and the canopy gap fraction of Catalpa bungei were measured by using a LAI-2000 plant canopy analyzer. The results showed that LAI among different clones had significantly seasonal variability, and the LAI changing trends of different clones were similar and characterized by an inverse “V” curve, with the peak occurring in September. So were the canopy gaps, whereas with an exceptional “V” curve and the valley occurring in September as well. Obviously, the seasonal variability of the LAI and the canopy gap fraction were completely opposite. Additionally, seasonal differences in leaf angels of Catalpa bungei fluctuated within a limited range, representing a flat canopy pattern. However, there was a big change in canopy uniformity. The well-grown clones have the best canopy uniformity, the poor growth clones have the most inhomogeneous. Also, the correlation between LAI and canopy gap fraction was extremely significant, effectively characterized by an exponential equation y=ae^-bx, with a determinant coefficient of above 0.980.

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贠慧玲,王军辉,赵秋玲,李银梅. 楸树叶面积指数的测度及冠层空隙度的季节动态[J]. 南京林业大学学报（自然科学版）. 2013, 37(02): 59-64 https://doi.org/10.3969/j.issn.1000-2006.2013.02.011

YUN Huiling,WANG Junhui, ZHAO Qiuling, LI Yinmei. Seasonal variability in leaf area index and canopy gap fraction of Catalpa bungei [J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2013, 37(02): 59-64 https://doi.org/10.3969/j.issn.1000-2006.2013.02.011

中图分类号： S718

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基金

收稿日期:2011-08-11 修回日期:2012-11-08
基金项目:国家林业公益性行业科研专项项目(201104001); “十一五”国家科技支撑计划(2006BAD24B0801)
第一作者:贠慧玲,工程师。*通信作者:王军辉,研究员,博士。E-mail: wangjh@caf.ac.cn。
引文格式:贠慧玲,王军辉,赵秋玲,等. 楸树叶面积指数的测度及冠层空隙度的季节动态[J]. 南京林业大学学报:自然科学版,2013,37(2):59-64.