Setting the long-term strategy of improving and maintaining the land productivity, adjusting the forest composition and structure so as to improve the forest quality in Beijing.
同时还应把维护和提高地力、调整森林的组成和结构作为提高森林质量的一项长期策略；
Shifts in forest species composition ramify through the ecosystem in many ways because tree species have different, often unique properties.
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。
Long-term effects are primarily mediated by changes in tree species composition and the consequent alterations of forest structure, productivity, and nutrient uptake.
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。
Like every forest, every plain has its own personality, so hunt around until you have found an Angle and composition that reflect it.
和森林一样，每一块草原也都有自己独特的气质。所以你要四处搜寻，找到一个可以反映这种独特气质的角度和构图。
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.
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。
Together they form a seemingly random composition of the facade cladding that mimics the rhythm of trunk verticals in the nearby forest.
它们一起组成看似随意的立面包层，与附近树林中的垂直树干一起奏响和谐的乐章。
Results showed that the model simulation of forest species composition, biomass and production matched well with observed data.
结果表明模型能较好地模拟暖温带落叶阔叶林的长期动态变化特征。
Traditional method analyze, return to with main composition analysis with quantity theory come, realize, set up to forest type go on, divide and appraise progressively.
传统方法用主成分分析、逐步回归分析和数量化理论来实现对森林立地进行分类和评价。
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.
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。
In this paper the distribution, quantity and composition of the microbiological flora and the biochemical activities of the forest soil in coastal beach of Hepu were studied.
本文对合浦滨海和海滩森林土壤微生物区系的分布、数量、组成及生化活性进行了研究。
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.
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。
The law of net productivity composition in various stand types is basically identical with that of net productivity distribution in various forest tree organs.
林木仍然处于继续生长阶段，各类型林分净生产量组成和林木层各组份净生产量的分配，都表现为基本一致的规律。
Therefore, we evaluated the effects of forest loss and landscape composition on the reproductive life-history parameters.
因此，我们估计了森林丧失和景观组成对它们繁殖生活史参数的影响。
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.
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。
Fire disturbance only led to a significant difference in stand composition and diameter class structure for the stands at different locations, rather than completely destroying the forest.
火干扰并未完全地破坏森林，仅仅是导致林分中不同地点上林分组成和红松径阶结构的差异明显。
Using typical sampling method, the paper studies the composition and important value of plant species in subalpine spruce fir forest on Northern Slope of Changbai Mts.
采用典型抽样方法，对长白山北坡不同海拔高度带云冷杉林的植物种类组成及重要值进行了初步研究。
The quality and composition of the pine forest and oak forest were highly similar while the relationship between the composition of light and the canopy characters varied with forest types.
光资源的数量及其组成在油松林和辽东栎林下的变化非常相似，但光资源的组成与林冠特征的关系在两种森林间存在差异。
Diet composition of forest musk deer Moschus berezovskii in winter and spring was studied by using a method of micro histological analysis of feces.
利用粪便显微组织分析法对陕西凤县野生林麝冬季和春季的食性进行了研究。
These forests, representing their respective geographic and climatic zones typical of forest types, together, more or less reflect the composition of China's territory forest.
这些原始森林，代表着各自地域和气候带典型的森林类型，综合起来，大致反映中国森林的版图构成。
It embodied the composition characteristics of bird communities in forest-stepped ecotone from forest zone to steppe zone gradually trastion.
体现了森林草原交错带鸟类群落的组成特点，即由森林鸟类逐渐向草原鸟类过渡。
Similarity of forest community species composition of herb layer did not change evidently.
草本层物种组成的相似性随海拔上升无明显变化趋势。
In the floristic composition of this forest the families of tropics and mainly tropics distribution make up 70% of the total families;
该地蕨类区系具有东南亚热带的性质，其分布区类型的组成是：热带分布或主产热带的科占总科数的70％以上；
The forest filled with a variety of sound, the wind "rustle" to ring, rain "rhythm" to fall, the birds "chirp" cried, insects "tweeted" Ming, a variety of natural sound composition of a symphony .
林间充次着各种声响，风“沙沙”地响着，雨“淅淅沥沥”地落着，鸟类“唧唧喳喳”地叫着，虫子“啾啾”鸣着，各种自然界的声响组成一部交响乐。
The litter layer in forest gaps was thinner than that under the canopy, the composition of the litter layer was herb remains and root twister while that was in half decomposition;
林隙土壤的枯枝落叶层比林下薄，其组分主要是草本和根系盘结物且呈半分解状态；
The litter layer in forest gaps was thinner than that under the canopy, the composition of the litter layer was herb remains and root twister while that was in half decomposition;
林隙土壤的枯枝落叶层比林下薄，其组分主要是草本和根系盘结物且呈半分解状态；
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