干旱

The location variation of arid and semiarid boundaries is closely related to regional warming and precipitation reduction.

干旱和半干旱分界线的位置变化与区域升温和降水减少密切相关。

The North-western region of China, where it is arid or semiarid, is the most important in stock-raising of the country.

地处干旱半干旱带的西北地区，是我国最重要的畜牧业基地。

As far as the sustainable agriculture in arid and semiarid areas is concerned, it is an important problem to develop water-saving agriculture and increase Water Use Efficiency.

发展节水农业，提高水的有效利用率，是保证干旱半干旱地区农业可持续发展的重要问题。

The social and economic sustainable development in the arid and semiarid area in China has been restricted by sandy desertification heavily.

沙漠化是制约我国干旱、半干旱地区社会经济可持续发展的重要因素。

Of arid and semiarid open country.

产于干旱和半干旱地区的空旷乡间。

The region is semiarid to arid in overall climate.

这个地区总体上是半干旱至干旱气候。

This phenomenon is widely distributed in arid and semiarid area.

中国西北广大地区地处干旱半干旱地区，风蚀严重地影响着这些地区的农业生产。

College of Resources and Environment, Beijing Forest University,The Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University, Beijing P.

北京林业大学资源与环境学院，北京林业大学省部共建森林培育与保护教育部重点实验室，国家林业局干旱半干旱地区森林培育及生态系统研究重点开放性实验室，北京，100083

Soil erosion by wind, as a natural disaster haunts on dry lands, not only degrades soil productivity but also often results in dust blizzard weather. It may cause pollutions of air and water, damages of highway and railway, wear and tear of buildings and machinery and harmfulness in health of people and animals. Therefore, to combat wind erosion means improving the environment for people to live and work, means heightening the living standard of the local people, and means promoting productive forces. But China has a vast land where probably occur wind erosion disasters, the arid, semiarid and subhumid areas of the temperate zone all are potentially hit by wind erosion. To control wind erosion in China is a very arduous task. More difficult is to achieve recognizable effectiveness with lowest cost.

中文题名宁夏土壤风蚀研究副题名外文题名 Estimation of wind erosion in Ningxia 论文作者李玉宝导师王礼先孙保平教授学科专业水土保持与荒漠化防治研究领域\研究方向荒漠化防治学位级别博士学位授予单位北京林业大学学位授予日期2001 论文页码总数100页关键词风蚀土壤风蚀土壤侵蚀馆藏号BSLW /2003 /S157 /14 中国发生土壤风蚀的潜在区域包括温带干旱、亚干旱和亚湿润气候下的广大地区，如何有效地预防和治理土壤风蚀，如何以最小的代价达到满意的防治效果，这是很值得研究的问题。

The eco-physiological characteristics of drought endurance of Pinus sylvestris var.mongolica were studied under different climatic regions, soil water and leaf water condition.Furthemore,the response and adaptability of trees to water stress was done.The below showed the results. 1 The parameters of drought endurance of P. sylvestris var. mongolica was measure and studied by PV technology in the subhumid, semiarid and arid regions The results indicated the osmotic potentials at water saturation condition and at the initial loss turgor decreased as the climatic drought degree increased,and related linearly with the climatic moisture index.It was proved that the drought endurance of P. sylvetris var. mongolica was varible and the elevation of the osmotic adjust capability was a main way to the adaptation of trees to the drought climatic environment.

本文研究了樟子松(Pinus sylvestris var.mongolica)的主要耐旱生理生态特征在不同地区、不同土壤水分状况和叶水分状况下的变化，进而研究了樟子松对水分胁迫的反应和适应，结果如下： 1 应用 PV 技术对半湿润区、半干旱区和干旱区樟子松耐旱性指标测定研究指出，水饱和总体渗透势和初始失膨点总体渗透势随着气候干旱程度增加而增加，与气候湿度指标呈直线相关，证明了樟子松属于耐旱性可变的树种，渗透调节能力增加是其对干旱气候适应的主要途径。

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