生态学杂志2024，Vol.43Issue(7)：2046-2054,9.DOI:10.13292/j.1000-4890.202407.042
华北落叶松人工林不同林隙径高比下冠层特征及其对幼苗幼树生长的影响
Canopy characteristics under different gap diameter/height ratios of Larix principis-rupprechtii plantations and their effects on the growth of seedlings and saplings
摘要
Abstract
We examined the status of gap diameter/height ratio(DEG/H)of Larix principis-rupprechtii plantations in Guandi Mountain,and explored the canopy structure and light factors of DEG/H of different grades and their effects on the growth of seedlings and saplings regenerated under gaps.We classified gap size into five grades based on DEG/H:Ⅰ(0.1-0.4),Ⅱ(0.4-0.7),Ⅲ(0.7-1.0),Ⅳ(1.0-1.3),Ⅴ(1.3-1.6).We analyzed the changes in canopy structure and light factors under different gap grades,the correlation between canopy structure and light factors,the impacts of gap size on regeneration density and growth indicators of seedlings and saplings,and the cor-relation between canopy structure and light factors and seedlings and saplings.The DEG/H values of L.principis-rup-prechtii plantation were roughly distributed between 0.17 and 1.52,with the highest number of gaps within the range of 0.4-0.7.Canopy opening(CO),direct radiation(Ttdr),scattered radiation(Ttdf),and total radiation(Ttot)showed a trend of gradually increasing with gap sizes,while leaf area index(LAI)exhibited a trend of gradually decreasing,with a pattern of Ttot＞Ttdf＞Ttdr under the same gap sizes.The growth indicators of L.principis-rupprechtii seedlings at grade Ⅰ were the largest(average ground diameter of 2.40 cm,average height of 2.69 m),while those of saplings within the forest(CK)were the highest(average ground diameter of 4.15 cm,average tree height of 5.04 m),followed by grade Ⅴ(with an average diameter of 3.41 cm and an average height of 3.34 m).The growth indicators of Picea asperata seedlings and saplings were the highest at grade Ⅳ(the average ground diameter of seedlings was 1.31 cm and an average height of 0.47 m;the average ground diameter of saplings was 4.03 cm and an average height of 2.89 m).Our results indicate that canopy structure and light environment conditions are the best when the ratio of gap diameter to height is at grade Ⅴ,and the conditions at grades Ⅰ,Ⅴ,and Ⅳ can provide an optimum living environment for the establishment of seedlings and saplings in the gaps of L.principis-rupprechtii forests.关键词
林隙径高比/冠层结构/林下光环境/幼苗幼树生长Key words
gap diameter/height ratio/canopy structure/understory light environment/the growth of seedlings and saplings引用本文复制引用
张宇,冯泳翰,赵怡,闫珏,朱景康,常晨隆,梁文俊,魏曦..华北落叶松人工林不同林隙径高比下冠层特征及其对幼苗幼树生长的影响[J].生态学杂志,2024,43(7):2046-2054,9.基金项目
国家自然科学基金项目(31971644和31901365)和山西省高等学校科技创新项目(2021L105)、山西省优秀博士来晋工作奖励资金科研项目(SXYBKY2018032)和山西农业大学科技创新基金项(2018YJ09)资助. （31971644和31901365）
