水土

The reasons of water cycle being destroied are as follows: Because of the forest-steppe vegetation destroied and water and soil erosion, water resource conservation layer is destructed, and surface water and groundwater of mountainous areas is also damaged. Groundwater is damaged as a result of poor drainage of mining industry. The river channelization destroies surface water and wetland groundwater. The plain groundwater is damaged because of excessive exploitation. The decreasing of actual evaporization destructs precipitaion cycle.

发现了自然水循环各环节被破坏的原因：森林草原植被破坏和水土流失，破坏了水源涵养层，破坏了山区地表水和地下水；矿业不良排水破坏了山区地下水；河流渠道化破坏了地表水和湿地地下水；过量开采破坏了平原地下水；陆地实际蒸发量的减少，破坏了大气降水循环。

At present, the forecasting methods and preventing countermeasures have being widely researched at home and abroad , but the ranges were mainly fastened on farmland and forest of large areas or drainages, so the reports about its application study that including the Expressway construction projects are few.

目前，水土流失预测方法及防治对策在国内外已有很多研究，但研究范围多集中于大面积区域或流域的农、林地，对于包括高速公路在内的大型建设项目的应用研究报道尚不多见。

Primary research involves classification of ecosystem types and basic evaluation units; development of a map of ecotypes; measurement of biomass, productivity and crosion and analysis of the pattern of space structures in landscape units.

主要研究内容包括：生态系统类型及评价单元的划分；生态类型图的编制；生物量生产力和水土流失状况的测定；以及景观单元的空间结构格局分析等。

The main aim of the present study was to address: 1 the photosynthetic characteristics and the biomass allocation traits of spring ephemerals and 2 the relationship between these traits and unique growth pattern of thes.

准噶尔荒漠分布的早春短命植物不仅具有十分独特的生物学特点，而且在荒漠植物群落演替、物种多样性维持及土壤改良与防治水土流失等方面具有重要的生态学价值。

The comprehensive measures, which are water and soil conservation, reasonably applying fertilizer, fully making use of many pools system inside the watershed, planting plant fence along contour, planting forest belt and grass belt, and controlling pollutant of paddy fields to run off etc, can been taken to regulate and control the non-point source pollution in the small watershed.

7可通过作好流域的水土保持工作，科学合理施肥，充分利用流域内的多水塘系统，种植等高植物篱、林带、草带和控制水田非点源污染物流失等综合性措施调控流域的非点源污染。

Floodings have been a related consequence of soil erosion.

Floodings已经相关的水土流失。

The ecologicalcharacteristics of community structure, species diversity, its ecological effects on soil health,and eco-system functions of soil water holding capacities, water and soil conservation effectswere studied symmatically in Nverzhai watershed , which was the key experiment anddemonstration spot of the Yangtze River Proctction Fores.

针对长江中下游低山丘陵区土地退化现状和我国现阶段生态工程建设需求，以湘西北武陵山区女儿寨小流域为研究对象，研究了7种典型植被恢复模式的群落结构、生物量分配格局、物种多样性、土壤健康效应等生态学特征及水土保持、水源涵养等生态系统服务功能，具有重要的理论意义和应用价值。

However, with low forest cover, soil erosion is more serious.

但森林覆盖率低，水土流失较为严重。

In this paper, we analysed the use present situation and the existng problems of land resources in Xin Yang region by a host of statistics, and expounded the essential causes of soil erosion, soil pollution, soil fertility drop,soil gleying and ploughland reduction and so on.

本文以大量的统计资料分析了信阳地区土地资源利用现状和存在的问题，阐明了引起本区水土流失，土壤肥力减退，低产田，土壤污染，土壤潜育化，耕地减少等问题的根本原因，针对这些问题，提出了一些对策。

Land resources problem water soil loss soil pollution soil gleying rational use countermeasure.

豫南农专学报，，编辑部邮箱 1991年 01期土地资源；问题；水土流失；土壤污染；合理利用；对策

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。