摘要
为了解不同坡向环境因子对雪岭云杉林天然更新的影响,在天山北坡中段同一海拔雪岭云杉林的阴坡、半阴坡、半阳坡、阳坡设置系列样方开展调查,构建不同坡向环境因子-更新指数结构方程模型,根据各坡向环境特征分析云杉幼苗存活现状与环境因素间的关系。结果表明:(1)半阴坡和半阳坡更适宜幼苗的存活和生长,二者更新指数(0.065、0.057)显著高于阴坡和阳坡;(2)凋落物对雪岭云杉更新有双重作用,凋落物未分解层过厚不利于更新,丰富的有机质可促进土壤形成高氮环境,有利于林下幼苗更新;(3)不同坡向环境因子对更新指数的作用强度依次为:全氮含量(0.60)>成年树密度(0.46)>凋落物半分解层(0.37)>全钾含量(0.24)>有机质含量(0.23)>全磷含量(-0.16)>速效磷含量(-0.32)>凋落物未分解层厚度(-0.34)。综合来看,该区域的雪岭云杉幼苗在郁闭度大小为0.6左右,凋落物厚度为2.5 cm左右,土壤全氮、全钾含量较高的半阴坡、半阳坡更新较好。
The influence of different slope-facing environmental factors on the natural regeneration of Picea schrenkiana in the middle section of the northern slope of Tianshan Mountains was investigated.A series of plots were established on shady,semishady,semisunny,and sunny slopes at the same altitude,in a Picea schrenkiana forest to develop the structure equation model for the regeneration index which uses different slope-facing environmental factors.According to the environmental characteristics of the different slope-facings,the relationship between the survival status of Picea schrenkiana seedlings and environmental factors was analyzed.The results showed that the semishady and semisunny slopes were more suitable for the survival and growth of seedlings,and the regeneration indexes of the two slopes(0.065 and 0.057)were significantly higher than those of the shady and sunny slopes.Litter was found to have a dual effect on the regeneration of Picea schrenkiana.The undecomposed litter layer was too thick to be beneficial to regeneration,while the rich organic matter could promote the formation of a high nitrogen environment in the soil,which was conducive to the regeneration of seedlings.The influence of different slope-facing environmental factors on the regeneration index was in the order of total nitrogen content(0.60)>adult tree density(0.46)>litter half-decomposed layer(0.37)>total potassium content(0.24)>organic matter content(0.23)>total phosphorus content(−0.16)>available phosphorus content(−0.32)>litter undecomposed layer thickness(−0.34).Overall,the regeneration of Picea schrenkiana seedlings in the region was best on the semishady and semisunny slopes with a closure degree of approximately 0.6 and litter thickness of approximately 2.5 cm,as well as high total nitrogen and total potassium contents in the soil.
作者
王冠正
常顺利
王建萍
张毓涛
孙雪娇
李翔
WANG Guanzheng;CHANG Shunli;WANG Jianping;ZHANG Yutao;SUN Xuejiao;LI Xiang(Key Laboratory of Oasis Ecology under the Ministry of Education,College of Ecology and Environment,Xinjiang University,Urumqi 830046,Xinjiang,China;Tianshan Forest Ecosystem National Station,Urumqi 830063,Xinjiang,China;Institute of Forest Ecology,Xinjiang Academy of Forestry,Urumqi 830063,Xinjiang,China)
出处
《干旱区研究》
CSCD
北大核心
2023年第10期1661-1669,共9页
Arid Zone Research
基金
中央财政林业改革发展资金任务“新疆天然林保护工程区森林生态系统服务功能价值评估”
新疆林业生态基础类项目“生态树种新品种选育与生态修复关键技术研究”(XJLYKJ-2021-20)。
关键词
雪岭云杉
天然更新
坡向
环境因子
结构方程模型
天山北坡
Picea schrenkiana
natural regeneration
slope
environmental factors
structural equation mod-el
northern slope of Tianshan Mountains
