荒漠化

And also the fundamental reasons for it under the influence of the intervening of human activity.

系统阐述在人类活动的干扰下土地荒漠化的基本原因； 8。

It brought out environmental deterioration and economic poverty, which are the largest menaces to human beings in the 21th century.

土地荒漠化是全球性的重大环境问题，其造成的生态环境恶化和经济贫困成为21世纪人类所面临的最大威胁，成为关系人类生存发展和影响全球稳定的重大问题。

The area of severely degraded grassland had increased to 818.97 km 2. In some places and in some periods overstocking did occur, but the grassland as a whole was not overgrazed. The degradation of local grasslands could be due to the...

在个别地区、个别时间、局部草地有超载，但从整体上讲，整个草地并不过牧；全球气温升高所引起的荒漠化，应是处于半干旱—半湿润干旱区的达日县草地退化、大片黑土滩产生的主要原因。

The serious degeneration of grassland and environment caused by years of predating exploitation became the main obstacle for sustainable development in this area.

但长期以来，由于对草原掠夺式开发利用，导致草原重度退化、资源萎缩、荒漠化扩张，成为西部经济可持续发展的主要障碍。

With development of man-made oases in headstream zone and upper and middle zone of trunk stream zone, the origin water resource system was destroyed. This caused a serial of ecological problem on tobogganing groundwater level, ruining Green Corridor, intensifying land desertification, etc.

源流区和干流上、中游人工绿洲的发展，破坏了原有自然水资源系统，使输往下游的水量不断减少至中断，从而造成塔河干流下游地下水位急剧下降、绿色走廊衰败、土地荒漠化趋势加剧等一系列生态问题。

Observation on structure of leaves of common plant in steppe desert.

荒漠化草原常见植物叶内部结构的观察。

But don't fret – whatever catastrophe, armageddon or ecocide befalls us, measures are at hand to make sure that if we survive a nuclear winter or total desertification, we'll be able to recreate a bucolic paradise: This Tuesday (26th), Norway opened the Svalbard Global Seed Vault on the island of Spitsbergen in the Arctic circle.

但是不要担心-无论灾难，世界末日或生态灭绝的遭遇，我们的措施已经在手，以确保如果我们生存的一个核冬天或全部荒漠化，我们将能够重新建立一个b ucolic天堂：这周二（ 2 6日），挪威打开斯瓦尔巴群岛全球种子跳马于岛上的斯匹次卑尔根群岛，在北极圈内。

The formation of land desertification has being developed mainly by the man factor with the cooperation of natural f...

对民勤县荒漠化的防治目标、实施步骤和具体措施分别予以阐述

Moreover, open-cut mining had lead to serious losses of water and soil through desertification.

而且，露天采矿更直接导致了水土的严重流失和土壤荒漠化。

Through strengthening natural forest conservation and nature re-serve management, continuing key eco-protection projects, establishing important ecosystems, and stepping up natural ecological restoration, by 2010 some 90 percent of typical forest ecosystems and key national wildlife species will be under effective protection; nature reserves will account for 16 percent of the national territory; 250,000 sq km of land suffering from water and soil erosion will have been improved; 300,000 sq km of land will have been ecologically restored; and 22 million ha of desertified land will have been put under control.

通过加强天然林资源保护和自然保护区的监管，继续开展生态保护重点工程建设，建立重要生态功能区，促进自然生态恢复等措施，到2010年，力争实现90%左右的典型森林生态系统和国家重点野生动植物得到有效保护，自然保护区面积占国土总面积的比重达到16%左右，综合治理水土流失面积25万平方公里，实施生态修复面积30万平方公里，治理荒漠化土地面积2200万公顷。

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。