演替

In successional process of wetlands, bare land Suaeda salsa community, Tamarix chinensis community organic matter content decreased by 81.0%、67.4% and 59.5% separately compared to Imperata cylindrical community,total N decreased 61.1%,59.6%,41.2%,available N decreased 69.2%,60.1%、46.8%,available P decreased

在湿地演替过程中，光板地、翅碱蓬群落、柽柳群落有机质含量与白茅群落相比，降低了81.0%、67.4%、59.5%，全氮含量降低了61.1%，59.6%，41.2%。

Was a shallow tree, whereas a high density was distributed below 30cm. Reverse succession of wetland communities, generally, from Imperata cylindrical community, Tamarix chinensis community Suaeda salsa community to bare land. If the ground was perennial water and abundance of seasonal water , the reed community replaced Imperata cylindrical community Tamarix chinensis community and Suaeda salsa community.

逆向演替的湿地群落，一般由白茅群落、柽柳群落、翅碱蓬群落向光板地方向进行，但如果生境地势低洼，常年积水或季节性积水较多，白茅群落、柽柳群落、翅碱蓬群落由于不能忍受经常性的积水危害，会逐渐被芦苇群落取代。

In this paper, we studied seasonal variation of endogenous IAA、 GA_3、ZR and ABA content of Leymus chinensis、 Agropyron michno、 Stipa grandis、 Cleistogenes sguarrosa、 Koeleria cristata、 Carex korshinskyi、 Allium bidentatum、 Artemisia frigida, Kochia prostrate and Potentilla acaulis in different restoring succession stages, which were determined by ELISA in the growing season in 2005. At the same time we recorded the phenological development and growing regulation of each kind of plant.

本文于2005年生长季，对处于不同恢复演替阶段的羊草、米氏冰草、大针茅、糙隐子草、草、黄囊苔草、双齿葱、冷蒿、木地肤和星毛委陵菜十种植物，运用酶联免疫吸附法，测定内源生长素、赤霉素(GA_3)、细胞分裂素和脱落酸含量的季节动态，同时记录每种植物的物候期和生长规律情况。

In tide of coastal waters bare and respect of laky eutrophication prevention and cure, obtain bare of the East China Sea material of whole process of tide happening, succession, confirm crucial physics process forms primary value in bare tide, consider to make clear, the Yangtse River pours fresh water or composition of salt of nutrition of area of tall hair of tide of bare of the East China Sea reachs content to be planted to bare tide choose He Chichao to form have conclusive effect.

在近海赤潮和湖泊富营养化防治方面，获得东海赤潮发生、演替全过程资料，证实关键物理过程在赤潮形成初期的重要性，探究表明，长江冲淡水或东海赤潮高发区营养盐组成及含量对赤潮种遴选和赤潮形成具有决定性功能。

The results showed that ①during the natural recovery process,4 tree species such as Pinus massoniana, Dalbergia hupeana were declined, 9 species such as Castanopsis carlesii, Lithocarpus heryi, Liquidambar formosam...

结果表明，在次生林演替过程中，马尾松、黄檀、山核桃、板栗为衰退种；化香、麻栎、白栎、枫香等 9个树种为过渡种；苦槠、木荷、青冈、杉木为进展种。

So studying the processes and mechanisms of soil hydrology of microbiotic crusts as well as analyzing its influence on soil water conditions in fixed dunes will play an important role theoretically and practically in understanding the evolution of artificial vegetation community in fixed dunes and the security of artificial sand-fixing vegetation system.

因此，通过野外试验揭示微生物结皮对土壤水文过程的影响和机理，评估其对雨养植被固沙区土壤水环境的影响，对于认识固沙区人工植被群落的演替和人工植被固沙体系的安全性都有着重要的理论意义和实践意义。

The rehabilitation mechanism of bush vegetation is to increase bio-diversity and community stability, improve and make full use of the eco-economic benefits of forests for conserving water resources in line with the law of vegetation succession and by means of artificial auxiliary measures The successive sequence of bush vegetation is Vitex negundo var.

灌丛植被的恢复机理是以植被演替规律为依据，通过人工辅助措施提高植被的生物多样性和群落稳定性，改善和充分发挥其水源保护功能和生态经济效益。

The environmental palaeobotany, one of new research fields in palaeobatany, investigates palaeovegetation succession, discusses i...

环境古植物学是古生物学中一个新的研究领域，它探讨地质历史时期古植被的演替、化石植物与环境之间的内在联系，恢复地史时期的古气候与古环境。

The environmental palaeobotany, one of new research fields in palaeobatany, investigates palaeovegetation succession, discusses internal relations of fossil plants-environment and reconstructs change of palaeoclimate and palaeoenvironment through geological time.

环境古植物学是古生物学中一个新的研究领域，它探讨地质历史时期古植被的演替、化石植物与环境之间的内在联系，恢复地史时期的古气候与古环境。

Fire and human activities increased the domination of oak forests because of their biological features of oak trees. Cutting repeatedly was the main reason for the domination of Quercus mongolica forest in recent 100 years in north and east China. During the succession of ...

火是原生性质蒙古栎林在地质历史时期存在和扩散的根本原因，过度的人类活动是促成现在蒙古栎次生林占优势地位的主要原因，这是由蒙古栎这个树种的生物学特性决定的，在没有外界因素的干扰和火减少的情况下，蒙古栎在演替过程中逐渐被耐荫的树种所取代，但是在中国北方，由于人类活动的加剧，蒙古栎林的优势度有增加的趋势。

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