There is usually a good deal of turnover in species composition, even in a mature community.
即使在一个成熟的群落中，物种组成通常也有很大的变化。
Experiments suggest that if fire did not occur in savannas in the Americas, species composition would change significantly.
实验表明，如果美洲稀树大草原没有发生火灾，物种组成将发生显著变化。
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。
The species composition of ticks varied with different months.
不同月份的蜱种组成有所不同。
Water colors have a close connection with phytoplankton species composition.
水色与浮游植物种类组成密切相关。
Species richness and evenness were unrelated to similarity in species composition.
物种丰富度和均匀度均与物种构成上的相似性没有显著相关关系。
The species composition, variation in biomass and their succession were investigated.
分析了水库水生生物种类组成、数量变化和群落演替。
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。
The species composition and characteristics of mangrove flora in the world were reviewed and discussed.
探讨了世界红树林植物区系的种类组成及其特点。
Third, Species composition and parasited location of scale insects in Greenhouses of Beijing were analysed.
第三，对北京地区温室蚧虫种类组成及寄生部位进行了分析。
Objective To investigate species composition of gamasid mites, chigger mites and flea on the rodent in Zhuhai Port.
目的调查珠海口岸地区鼠体表寄生虫蚤、革螨、恙螨、蜱、吸虱的种群组成。
The species composition in the insect community and the relative abundance of each group were studied in the peach orchards.
研究摸清了桃园昆虫群落的物种组成、各类群的相对多度。
The results also revealed that the species composition of fungi differed greatly between the interior and surface of leaves.
真菌分离结果表明在茶树叶片表面和内部组织中生长有显著不同的真菌群落。
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。
The results showed that Bacillus changed bacterial species composition of sediment and increased the number of aerobic bacteria.
结果表明：芽孢杆菌制剂改变了虾池表层沉积物细菌类群组成，增加了表层沉积物好氧细菌的数量。
These shifts in species composition may be benign, or they may result in a cascade of negative consequences throughout the Marine food web.
这些物种组成的转变可能是良性的，也有可能导致整个海洋食物网的一系列消极后果。
The species composition, structure, physiognomy and succession of mangrove community near Aotou port, Daya are disscussed in this paper.
本文报道了大亚湾澳头港附近的红树植物群落的种类组成、结构、外貌及演替。
The results showed that the probiotic Bacillus changed bacterial species composition of sediment and increased the number of aerobic bacteria.
结果表明，芽孢杆菌制剂改变了虾池底泥细菌类群组成，增加了底泥好氧细菌的数量。
Community structure of planktonic crustacean in the Xiqi river, Hangzhou including species composition, population dynamics and biomass, was studied .
本文研究了杭州西溪河浮游甲壳动物的种类组成、种群动态、生物量及其与环境因子的关系。
This experiment was conducted to understand the species composition, diameter distribution, types and decay classes of coarse woody debris(CWD) on the 9.
为对象，分析了粗木质残体（CWD）的物种组成、径级分布、存在形式、腐烂等级。
Objective To know the species composition of mosquito and their density in a battalion of a military base in Zhejiang province for mosquito control effectively.
目的了解驻浙某部营区蚊虫种群构成、密度情况，为有效控制蚊虫提供科学依据。
Conclusion the species composition of mosquito and their density in Zhejiang province were attained. This study provided scientific evidence for mosquito control.
结论初步摸清了某部驻浙营区及其周边环境蚊虫种类构成与密度情况，为今后开展有效的蚊虫防制提供了参考。
These similarities are then examined against measured environmental variables to link differences in species composition with algal cover in creased sedimentation etc.
这些类似性将与已测量的环境变量一起纳入研究，以便将物种组成方面的差异性与海藻的覆盖面积、沉淀增长等联系起来。
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。
This paper mainly reported species composition, biomass distribution of crabs and biological characteristic of Portunnus kaanii, P. san-guinolentus and Charybdis natator;
本文主要报道该海域蟹类的种类组成、数量分布以及经济种拥剑梭子蟹、红星梭子蟹和善泳（虫寻）的生物学特性；
The vegetation in Shenzhou peninsula of Wanning was studied with the method of line and sampling research, and the species composition and vegetation types were analyzed.
以海南省万宁市神州半岛区域现有植被作为调查对象，采用路线调查和样方调查相结合的野外植被调查方法，研究该地区植被类型的情况。
Meanwhile, relatively less species composition, relatively simpler level, relatively sparser density and richly varied color will be conducive to scenic beauty improvement.
同时，植物组成种类相对较少、层次较为简洁、密度较为稀疏、色彩富于变化则有利于提高景观的美景度。
Weed survey was conducted by sampling methods of inverted W-pattern to determine the species composition and structure of weed communities in maize fields in Hebei Province.
采用倒置“W”取样法对河北省玉米田杂草进行了调查，以明确田间杂草的种类组成及群落结构。
Weed survey was conducted by sampling methods of inverted W-pattern to determine the species composition and structure of weed communities in maize fields in Hebei Province.
采用倒置“W”取样法对河北省玉米田杂草进行了调查，以明确田间杂草的种类组成及群落结构。
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