广西植物2011，Vol.31Issue(4)：473-478,544,7.DOI:10.3969/j.issn.1000-3142.2011.04.011
三种人工林分的冠层结构参数与林下光照条件
Canopy structural parameters and understory light regimes of 3 artificial forest stands in South China
摘要
Abstract
Canopy parameters and understory light regimes of three artificial forest stands in South China,I. E. ,Eucalyptus, slash pine and mixed forest stands .were estimated using hemispherical photography based on quadrat method together with plant census,and the relationship between canopy structure and understory light regimes was analyzed. Leaf area indexes(LAI)of the 3 artificial forest stands were 1. 9,2. 7,and 2. 6,respectively,and their CV(coefficient of variation)was 11. 3%,14. 4% ,and 19. 3% ,respectively. Canopy Openness( CO) was 18. 1% ,10. 4% and 11.0%,and their CV was 13. 9%, 17. 7%and 26. 2%, respectively (Transmitted direct gap light(TransDir)was 6. 5,4. 0 and 3. 9 mol·m-2· d-1 ,respectively,and their CV was 22. 1%,22. 9%and 30. 8%,respectively. Transmitted diffuse gap light(TransDif)was 5. 5,3. 2 and 3. 3 mol · m-2 · d-1 .respectively,and their CV was 15. 2% ,14. 8% and 19. 2% ,respectively. High spatial heterogeneity in understory light regimes was found in the mixed forest stand. Correlation a-nalysis indicated that in all the 3 forest stands TransDif was significantly correlated with LAI or CO, while TransDir was significantly correlated with LAI or CO in the mixed forest stand. Canopy structure of the mixed forest stand exhibited higher spatial heterogeneity and had a direct impact on understory light regimes.关键词
冠层结构/林冠孔隙度/叶面积指数/半球面影像技术Key words
canopy structure/ canopy openness(CO)/ leaf area index(LAI)/ hemispherical photography分类
农业科技引用本文复制引用
贾小容,苏志尧,区余端,解丹丹..三种人工林分的冠层结构参数与林下光照条件[J].广西植物,2011,31(4):473-478,544,7.基金项目
广东省科技计划项目(2002C20703) （2002C20703）
广东高校优秀青年创新人才培育项目(209028) （209028）
