演替

Moreover,they form the edificator synusia of the community.

6个群落可分为 7个植被类型，分别处于群落的 4个演替阶段。

The study shows that: evergreen broad-leaved species during the middle and later period succession have better adaptability under the different light surroundings, such as Elaeocarpus glabripetalus, Ilex integra, Photinia prunifolia, Cinnamommum camphora. And Fluorescent Characteristics also verifies the above result. The experiment results indicate that: PSⅡreaction centers of majority tree species are not marked oxidized under the full light surroundings. Photosynthetic electron transport activity can maintain highly, in this way, it is helpful to enhance radiant energy dissipation and thus dissipate excess light energy. That is to say, the increase of non-photochemical quenching coefficient can conduce to protect PSⅡ, and mitigate the effect of high light on photosynthesis.

研究发现处于演替中后期的常绿阔叶树种幼苗，对光环境的变化均有着较强的适应能力，秃瓣杜英、全缘冬青、小叶铁冬青、桃叶石楠、香樟等树种的表现尤为突出；荧光特性的研究也应证了这一观点，测定结果表明多数树种的PSⅡ反应中心并未受到明显氧化破坏，在全光照条件下仍能维持较高的光合电子传递活性，能通过提高非辐射性热耗散，消耗PSⅡ吸收的过剩的光能，从而保护PSⅡ反应中心免受因吸收过多光能而引起的光氧化伤害。

A field experiment on the reproductive allocation of the annual plant Eragrostis poaeoides was carried out in the re-vegetated areas in Shapotou of the Tengger Desert.

繁殖是生命得以延续的唯一手段，它不仅是种群形成、发展和进化的核心问题之一，也是生物群落和生态系统演替的基础。

The relationship between weed invasion and intensity was analysed on sown pasture mixed by whiteclover and perennial ryegrass,and the preliminary results were that 1the number of invasive weeds ismainly dependent on grazing intensity;2the trend of species diversity was successively increase-decrease-increase when the grazing intensity is increase;3 principal invasion weed species are Lysimachiahemsleyana, Eragrostis nigra, etc,8 species;4the sown pasture in question is pioneer stage of the recoverysucce...

本文分析了白三叶草十多年生黑麦草混播人工草地上杂草入侵与放牧强度之间的关系，得出如下初步结论：1）杂草入侵的种数主要决定于放牧强度；2）α物种多样性随放牧加重而有增－减－增的趋势；3）入侵的主要杂草种为点腺过路黄等8个种；4）所论人工草地都处在恢复演替的先锋阶段，因而草地退化的进程还是能予以遏制的。

The faunal profiles revealed that the environmental stability and the homeostasis of the abandoned cropland and woodland lead to higher levels of community structure and the soil food web tend to succeed to maturity.

线虫区系分析结果表明，撂荒地和林地处理中土壤环境相对稳定，土壤食物网向较成熟的阶段演替。

Floristic composition, physiognomy, species diversity and the possible succession of the community were analyzed.

群落进行物种多样性测定，并分析了群落的种类组成、外貌、演替等。

As a concentration of seed plants diversity, NBG can produce a large quantity of various kinds of seeds, and the seeds may arrive at diversified habitats with the assistance of dispersal by frugivorous birds, Avian seed dispersal have spread the distribution of seed plants cultivated in NBG and have promoted their natural regeneration, furthermore, it has exerted a positive influence on development and succession of plant communities around the botanical garden.

南京中山植物园作为本地区种子植物多样性中心，提供了丰富多样的种子来源，鸟类传播种子有利于种子到达多样化的生境类型中，促进了植物园内植物的自然更新，扩大了植物的分布范围，丰富了植物园周围马尾松群落，以及虎山森林植物群落中的植物种类，对植物群落的发展和演替产生了积极的影响。

These are distributed largely in the litter layer, seeds of only 3 extant species were emerged from soil samples. In contrast all of the germinative seeds of the earlier seral species were distributed in the soil.

在种子库中，现存植物产生的种子绝大多数分布于枯枝落叶层，只有少部分（3种）可分布到土壤层，演替前期各阶段产生的种子全部分布在土壤层中。

Halophytic plants are the main vegetations on the north bank. Typha latifolia occurred on the south bank of Yellow River due to the eco-restoration engineering, indicating the law of vegetation succession in Yellow River Delta.

黄河北岸的植被主要以盐生植被为主，由于在黄河南岸实施恢复工程，南岸的植被中则出现了香蒲等物种，代表了黄河三角洲湿地植被演替的一个方向。

The ecological water level enhanced by 30m could provide appropriate environment for hydrophytic succession of wetland plants.

研究确定的最小生态水位具有一定科学性，湿地生态水位提高30cm，能够为该区湿地植被群落的水生演替提供适宜生境。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了