土壤保持

They were engaged in the study of soil conservation.

他们在从事土壤保持的研究。

He practiced crop rotation and soil conservation a century before these became standard practice, and he invented a plow superior to any other in existence.

在人人普遍采用农作物轮作和土壤保持的作法以前一个世纪，他就这样做了。他还发明了一种比当时任何一种都好的耕犁。

He practiced crop rotation and soil conservation a century before these became standard practice, and he invented a plow superior to any other in existence .

在人们普通采用农作物轮作和土壤保持的做法之前一个世纪，他就这样做了。他还发明了一种比当时任何一种都好的耕犁。

It also keeps the soil cooler and helps to stop water from evaporating.

同时它也使土壤保持较低的温度，从而有助于防止水分蒸发。

Water seeping from pores of fictile pipe to moist soil and crop root system.

因土层内的陶管侧壁有孔，水由陶管孔渗入土壤保持作物根据系土层长期湿润。

Stonework aids erosion control and soil retention.

石雕艾滋病防治水土流失和土壤保持。

The sixth part: Studies on the dynamic changes of soil retention function value of ecosystem in YUYANG District. Utilized ERDAS8. 5 to interpret the remote sensing image and get LUCC data and vegetation information of YUYANG District. Utilized R2V5. 5 to digitize administrative map, topographic map, vegetation picture, soil distribution map and meteorological website map. Utilized ARCINFOR8. 3 to change every digitization layer to the same projection, to generate Tyson polygon, to structure DEM and do vector polygon overlay. Utilized ARC VIE W3. 3 to obtain the grid data topographic slope and slope length from DEM data of YUYANG District, and then, turned every coverage layer into grid layer and do grid polygon overlay to gain data about dynamic changes of value of soil retention of ecosystem in YUYANG District, at last, the author analyzed the features of the spatial-temporal changes and its reason.The seventh part: Studies on the dynamic changes of fixing drifting sand against wind function value of ecosystem in YUYANG District.

第六部分：榆阳区生态系统土壤保持功能价值动态变化研究；利用ERDAS8.5对遥感数据进行解译获得榆阳区土地利用数据和植被信息，利用R2V5.5数字化榆阳区政区图、地形图、植被图、土壤分布图及气象站点分布图，利用ARCINFOR8.3对各数字化图层进行投影转换、泰森多边形生成、DEM构建和叠加分析，利用ARCVIEW3.3从DEM数据中获取榆阳区的坡度、坡长面域数据，并将上述各图层格网化，然后通过栅格图层叠加分析和代数运算获取榆阳区生态系统土壤保持功能物质量和价值量时空动态变化数据，最后分析了其变化的时空特点及形成原因。

Problems of soil conservation and shoreland development are not likelyto quickly disappear.

土壤保持和滨海地开发问题也不可能很快消失。

The wood mulch keeps the soil cool and maintains an even soil temperature.

木材和复盖可使土壤保持冷静，甚至土壤温度。

The Soil Science and Soil Conservation Institute ,belongs to Agriculture Department of Justus Liebig University,is an educational and sciectific researches arrangement.It has European characteristics on the education-style and the research running mechanism.

吉森李比希大学土壤和土壤保持研究所是李比希大学农学系下属的一个教学科研机构，其人员结构、组织管理方式、科研运行机制等在欧洲具有普遍性。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失