浙江农林大学学报2011，Vol.28Issue(4)：550-554,5.
基于光照强度变化的毛竹扩张对杉木影响的探讨
Light intensity changes on Cunninghamia lanceolata in mixed stands with different concentrations of Phyllostachys pubescens
摘要
Abstract
To help accumulate knowledge on the causes of death of Cunninghamia lanceolata due to expansion of nearby Phyllostachys pubescens bamboo stands, light intensity of three forest stands: a P. Pubescens forest; a needle, broadleaf mixed forest with C. Lanceolata; and a needle, broadleaf with C. Lanceolata, and bamboo mixed forest; at the edge of P. Pubescens bamboo stands was obtained using a quantum meter in 8:00-17; 00, from July to September, to detect the light intensity (I), and using Li-6400 Portable Photosynthesis System to detect the light compensation point (LCP), from 9:00 to 10:00. Results showed that light intensity (I), increased with greater concentrations of P. Pubescens within the forest stands: P. Pubescens (bamboo) forest > needle, broadleaf with C. Lanceolata, and bamboo mixed forest > needle, broadleaf with C. Lanceolata mixed forest. Compared with an open field light intensity decreased 49.31% for the P. Pubescens forest; 55.91% for the needle, broadleaf with C. Lanceolata, and bamboo mixed forest; and 85.70% for the needle, broadleaf with C. Lanceolata mixed forest. A light intensity relationship was shown with the equation; Ineedle.broadleaf = 0.027 3 Ineedle,broadleaf.bemboo + 0.032 0 Ibemboo + 2.297 0. Also, the highest LCP was found with P. Pubescens (19.60 μmol·m-2·s-1), then adult C. Lanceolata (9.77 μmol·m-2·s-1), and then C. Lanceolata saplings (9.78 μmol·m-2·s-1); thus, light intensity of adult C. Lanceolata and its seedlings was higher than the LCP, and the forests with C. Lanceolata could continue to make organic matter. But because of the shadow characteristics of C. Lanceolata seedlings, the increased light intensity could influence the C. Lanceolataseedlings due to less shade.关键词
森林生态学/毛竹/杉木/光照强度/光补偿点Key words
forest ecology/Phyllostachys pubescens/Cunninghamia lanceolata/light intensity/light compensation point (LCP)分类
农业科技引用本文复制引用
刘烁,周国模,白尚斌..基于光照强度变化的毛竹扩张对杉木影响的探讨[J].浙江农林大学学报,2011,28(4):550-554,5.基金项目
国家自然科学基金资助项目(30771715,30900190) （30771715,30900190）
