摘要
为揭示影响南亚热带马尾松×红锥混交林下红锥天然更新的关键环境因子,本研究以1983年造林的马尾松×红锥人工林为对象,选取3个研究样地,设置50个2m×2m的调查样方,对红锥更新苗、土壤理化性质、林分结构与光环境等展开调查。结果表明,不同样地红锥天然更新密度为(132353±7050)^(174219±15580)株·hm^-2。5个高度级红锥更新苗密度差异显著,Ⅰ级最大,Ⅴ级最小,密度随高度级增加而递减。相关分析表明,土壤全磷含量对Ⅰ、Ⅴ级的红锥更新苗有明显的正效应,而对Ⅱ、Ⅲ级更新苗有明显的负效应;红锥Ⅰ级苗与土壤pH值呈极显著正相关;近地层透光系数与Ⅰ、Ⅱ、Ⅲ、Ⅳ级苗木密度呈负相关,与Ⅴ级呈正相关;林分上层平均叶倾角、近地层叶面积指数则与Ⅰ、Ⅱ、Ⅲ、Ⅳ级苗木密度呈正相关,与Ⅴ级呈负相关。研究所选择的25个林分结构与土壤环境因子组合对红锥天然更新分布格局的变异解释率达到66.01%,解释效果显著(F=2.0229,P=0.027)。土壤全磷含量、土壤pH值、海拔高度、林分上层平均叶倾角、近地层叶面积指数、近地层透光系数等6个因子是影响南亚热带红锥天然更新分布格局的关键因子。
In order to reveal the key environmental factors affecting the natural regeneration of Castanopsis hystrix in a mixed plantation of Pinus massoniana×C.hystrix in South China, taking the P.massoniana×C.hystrix mixed plantations afforested in 1983 as the object, 3 experimental plots were selected and 50 investigation sample plots were set to investigate the regenerated seedlings of C.hystrix, soil physical and chemical properties, stand structure and light environment. The results showed that the natural regeneration density of C.hystrix varied from (132 353±7 050) individuals·hm ^-2 to (174 219±15 580) individuals·hm^-2 . There were significant differences among the density of the 5 height level of the regenerated seedlings. The density of the Ⅰ level was the largest, and Ⅴ level was the smallest. The density decreased as the growth stage increased. Correlation analysis showed that the total phosphorus content of soil had obvious positive effects on level Ⅰ and level Ⅴ renewed seedlings of C.hystrix, but had more obvious negative effects on the level Ⅱ and level Ⅲ seedlings. The level Ⅰ seedlings were significantly positively correlated to soil pH. The penetration coefficient of the near surface layer was negatively correlated with the density of seedlings of level Ⅰ,Ⅱ,Ⅲ and Ⅳ, and positively correlated with level Ⅴ. The average leaf angle of the upper layer of the stand and the leaf area index of the near surface layer were positively correlated with the seedling density of level Ⅰ,Ⅱ,Ⅲ and Ⅳ, and negatively correlated with level Ⅴ. The combination of 25 stand structures and soil environmental factors selected in the study had a significant explanatory effect on the variation of the distribution pattern of natural regeneration of the seedlings, reaching 66.01%(F= 2.022 9, P =0.027). Six factors including soil total phosphorus content, soil pH, altitude, upper average leaf angle, near surface layer area index and near surface layer light transmission coefficient are the key factors affecting the natural regeneration distribution pattern of the tropical C.hystrix in South China.
作者
李运筹
周晓果
温远光
朱宏光
覃志伟
蔡道雄
贾宏炎
李晓琼
尤业明
LI Yunchou;ZHOU Xiaoguo;WEN Yuanguang;ZHU Hongguang;QIN Zhiwei;CAI Daoxiong;JIA Hongyan;LI Xiaoqiong;YOU Yeming(Guangxi Key Laboratory of Forest Ecology and Conservation, Forestry College, Guangxi University, Nanning, Guangxi, 530004, China;Guangxi Youyiguang Forest Ecosystem Research Station, Pingxiang, Guangxi, 532600, China;Experimental Center of Tropical Forestry,Chinese Academy of Forestry, Pingxiang, Guangxi,532600, China)
出处
《广西科学》
CAS
2019年第2期207-214,共8页
Guangxi Sciences
基金
国家自然科学基金项目(31860171,31560201)
广西重点研发计划项目(2018AB40007)
广西自然科学基金项目(2016GXNSFBA380222,2017GXNSFAA198114)
广西高等学校重大科研项目(201201ZD001)
广西森林生态与保育重点实验室开放课题(QZKFKT2017-01)
广西林业厅科研项目(桂林科字[2009]第八号)资助
关键词
红锥
人工林
天然更新
环境解释
Castanopsis hystrix
planted forests
natural regeneration
environmental factors
作者简介
李运筹(1993-),男,硕士研究生,主要从事森林生态学研究;通信作者:朱宏光(1962-),男,硕士生导师,副研究员,主要从事森林生态和森林培育学研究,E-mail:xu980307@163.com。
