沙漠化

Mongolica live were elaborated in detail. P. sysvestris var. mongolica live is naturally distributed in Greater Hinggan Mountains and Hulunbuir prairie in China and has been widely cultivated in "Three Norths" area since 1950's due to many years of introduction for cultivation.

樟子松在我国天然分布于大兴安岭和呼伦贝尔沙地草原，从20世纪50年代开始，经过多年的引种栽培，现已在&三北&地区被广泛地推广应用，成为造林的主要乔木树种，并对防治沙漠化起到了巨大的作用。

These projects are: the "three norths" shelterbelts (the western area of Northeast, and the northern parts of North and Northwest China), the shelterbelts along the upper and middle reaches of the Yangtze River, the coastal shelterbelts, the plain farmland shelterbelts, the Taihang Mountains afforestation project, the anti-desertification project, the shelterbelts for comprehensive control in the Huaihe River and Taihu Lake basins, the shelterbelts for comprehensive control in the Pearl River basin, the shelterbelts for comprehensive control in the Liaohe River basin, and the shelterbelts along the middle reaches of the Yellow River.

这些工程是：&三北&（东北西部、华北北部、西北地区）防护林体系工程、长江中上游防护林体系工程、沿海防护林体系工程、平原农田防护林体系工程、太行山绿化工程、防治沙漠化工程、淮河太湖流域综合治理防护林体系工程、珠江流域综合治理防护林体系工程、辽河流域综合治理防护林体系工程、黄河中游防护林体系工程。

These projects are: the ''three norths'' shelterbelts (the western area of Northeast, and the northern parts of North and Northwest China), the shelterbelts along the upper and middle reaches of the Yangtze River, the coastal shelterbelts, the plain farmland shelterbelts, the Taihang Mountains afforestation project, the anti-desertification project, the shelterbelts for comprehensive control in the Huaihe River and Taihu Lake basins, the shelterbelts for comprehensive control in the Pearl River basin, the shelterbelts for comprehensive control in the Liaohe River basin, and the shelterbelts along the middle reaches of the Yellow River.

这十大林业生态工程是：&三北&(东北西部、华北北部、西北地区)防护林体系工程、长江中上游防护林体系工程、沿海防护林体系工程、平原农田防护林体系工程、太行山绿化工程、防治沙漠化工程、淮河太湖流域综合治理防护林体系工程、珠江流域综合治理防护林体系工程、辽河流域综合治理防护林体系工程、黄河中游防护林体系工程，规划造林总面积1.2亿公顷。

The approaching of desertification adds too much gray into the sky of the city of Beijing, while the spirit-like poplar and willow catkins add cute into the gray.

吐纳沙漠化的逼近，让天空拥有太多的灰色，如精灵般的柳絮，杨絮增添了灰色的可爱。

In some cases, deserts are the creation of destruction of virgin forest.

在某些情况下，原始森林的破坏导致了沙漠化。

In some cases, deserts are the creation of destruction of virgin forest.

有些时候，沙漠化是原始森林毁灭的开始。

Enclosed sheep raising, to avoid over grazing, one reason for

把羊进行圈养，以防止过度放牧，这是造成宁夏土壤沙漠化的主要原因之一

Holocene stratigraphic profile at least documented 6 times reverse processes and 7 times positive processes of desertification during the Holocene period.

地层沉积相记录以及地层中古风成砂和古土壤层绝对年代的测定，证明末次间冰期以来研究区曾经历了多次沙漠化正、逆交替变化过程。

The interactional mechanisms between the anthropogenically induced environmental changes and the social-economic developments were analyzed with some cases. The effect of ecological disturbance on desertification was quantified. At the same time, the author put forward some pragmatic countermeasures for solving the environmental conflict and regional sustainable development.

通过案例解析了人类活动影响下区域环境变化与社会经济发展之间相互作用的机理，定量化分析了人类活动导致的生态破坏在土地沙漠化中所起的作用，提出了具有可操作性的解决环境冲突与区域协调发展的对策。

Soil seed bank and the mechanism of seed germination are basic for the natural vegetation restoration in the research area.

植被进展演替促进了沙漠化过程的逆转，研究区植物的土壤种子库及其萌发机制为天然植被的恢复提供了可能。

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。