长期影响主要是由树种组成的变化以及随之而来的森林结构、生产力和养分吸收的变化所导致的。
Long-term effects are primarily mediated by changes in tree species composition and the consequent alterations of forest structure, productivity, and nutrient uptake.
对直径生长转移概率矩阵模型进行了线性扩展，用以研究混交异龄林的树种组成问题。
A transfering probability matrix model of linearly generalized diameter growth was used to deal with the tree species composition problem of mixed unevenly aged forest.
分析了海南岛霸王岭自然保护区热带山地雨林林隙内树种的种类组成、数量动态以及林隙年龄和林隙面积对树种组成及数量的影响。
Species composition, quantitative dynamics and effects of gap age and gap size on species compositions were studied in the tropical montane rain forest of Bawangling Natural Reserve, Hainan Island.
通过对陕北榆林风沙区防风固沙林体系的配置结构、树种组成、防风固沙效益、改良土壤的作用以及对天然植被的影响等的调查、观测和分析，结果表明：其配置结构较为合理，生态效益较为显著。
The effects of the sandbreak forest system in Yulin sandy area on the sandbreak, soil improvement and natural vegetation recovery were studied by investigating their configuring structure and species.
由于树种具有不同的、往往是独特的特性，森林物种组成的变化以多种方式影响着生态系统。
Shifts in forest species composition ramify through the ecosystem in many ways because tree species have different, often unique properties.
害虫通常以特定的树种为目标，一旦形成，它们通常会成为生态系统的永久组成部分。
Pests often target specific tree species and, if they become established, they usually remain as permanent components of the ecosystem.
因此，应重视通过调整物种组成，增加阔叶树种比例以增强森林的自肥能力。
Therefore, it should be emphasized to enhance the self - fertilization capability of forest by adjusting the species composition and increasing the proportion of native broad - leaved species.
根据子午岭林区林虫区系组成和区划特征，结合主要树种害虫危害特点，提出了预防和除治子午岭林区森林害虫的3项措施。
Based on the fauna composition and division characteristics of forest pest insects in Ziwu Mountains and damage of pests on important tree species, 3 control countermeasures were provided.
天牛类害虫在各分布地区所联系的寄主树种，随着生物群落组成的变化而转移。
The long horned beetles in various distribution areas could transfer from one host tree to another when the composition of the biotic communities changed.
黔中喀斯特植被的主要组成树种间普遍存在着竞争关系．但不同树种间竞争强度有所差异。
The competition occurs widespreadly among the major component species of Karst vegetation in the middle area of Guizhou , but the intensity of competition vary among the species.
在物种来源方面乡土树种比例较大，引进物种也是其城市绿地植被的重要组成部分。
The local trees have a bigger proportion in species origin, and the introduce species is also a important part of green place in Baoding.
木兰科植物在植物系统分类学上具有重要地位，也是北半球亚热带森林的重要组成树种，主要集中分布于我国西南部和南部。
Magnoliaceae plants, which have important role in botanic systematic taxonomy and are also important trees in sub-tropic forests, mainly distribute in South and Southwestern China.
木兰科植物在植物系统分类学上具有重要地位，也是北半球亚热带森林的重要组成树种，主要集中分布于我国西南部和南部。
Magnoliaceae plants, which have important role in botanic systematic taxonomy and are also important trees in sub-tropic forests, mainly distribute in South and Southwestern China.
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