查询词典 fertile farmland

Soil erosion by wind is a major cause of farmland degradation in arid and semiarid area of north China.

土壤风蚀是中国北方干旱半干旱地区农田土地退化的重要原因。

Surface erosion occurs mainly in farmland, sparse grassland and woodland, is the rainfall and runoff erosion on the surface is relatively uniform, including the raindrop erosion, sheet erosion and rill erosion .

面蚀主要发生在坡耕地、稀疏牧草地和林地，是降水和径流对地表相对均匀的侵蚀方式，包括雨滴侵蚀、片蚀和细沟侵蚀。

The main results were summarized as follows: 1 After forestland was destroyed into farmland, the main erosion type changed from sheet erosion to intensive rill and severe shallow gully erosion, accelerated soil erosion was severe and erosion intensity was hundreds to thousands times greater than those in the forestland prior to deforestation.

随着开垦年限的增加，单位降雨侵蚀力引起的侵蚀量呈加剧趋势。在植被破坏15年的裸露休闲地浅沟集水区，侵蚀蚀强度随坡长的增加而增加，且浅沟槽侵蚀量大于浅沟间，切沟沟槽侵蚀量大于切沟间。

A soil wind erosion experimental plot was set up in the alluvial sandy land of old yellow river,which is in Xiajin County of Shandong Province,and the soil wind erosion quantity was tested with measuring scale method in the observation farmland shelter-forest network and the comparison place.

在山东省夏津县黄河故道冲积沙地建立土壤风蚀试验区，采用标尺法对3种网格的农田防护林和对照地的土壤风蚀量进行观测，测定结果表明：农田防护林网可明显减少风蚀损失，其中，130m×300m林网相对于对照减少土壤风蚀量81%，260m×300m林网相对于对照减少78%，300m×400m林网相对于对照减少75%，即随着网格面积的增加对风蚀量的影响越来越小。

Farmland path, football, swimming, basketball, volleyball, hockey, gymnastics, lift weights, bicycle, nelson, judo, gunning, fencing, skin rowling, sail boat etc.

田径、足球、游泳、篮球、排球、曲棍球、体操、举重、自行车、摔跤、柔道、射击、击剑、皮划艇、帆船等体育项目。

Drilling a hole in the coal seam, soft rock and in the farmland beat the well time and limited efficacy rate .

200米液压钻机主要用于钻探各种深度为200米左右的各种角度的各类用途的孔，可在不同硬度的岩石中钻孔，而在煤层、软岩石中钻孔以及在农田打井时效率最高。

The problem depends on -- we wanted those who solve 1/4 population of world to have a meal in the past problem, finite farmland cannot wide kind of soja of low yield.

问题在于——过去我们要解决世界四分之一人口的吃饭问题，有限的耕地不能广种低产的大豆。

Especially, the extending and popularization of the technique of "Cultivating Farmland and Pouring Liquid on the Ground for Solarization" made the quality of Jie salt improved.

隋唐时期的解盐生产技术有了明显发展，尤其是"垦畦浇晒"技术的推广和普及，使解盐的质量大为提高。

The amount of pesticide and herbcide applied was less, the pure quantity was only 1. 9kg/ha which is about 40％ of the Jinlin Province's average. In farmland, There are 26700ha of solonetz and solonchak, and 289700ha of salinized soil with the high content of salts. The salt content in the surface is 1％-2％ in soda meadow solonetz, 1％-4％ in sulfate meadow solonetz, below 0.7％ in meadow solonchak generally, and below 1％ in salinized soil. The runoff and the return flow from above lands have high content of salt and high output load of the soluble salt.

吉林西部耕地中有2.67万hm〓的盐土、碱土和28.97万hm〓的盐碱化土地，这些盐土、碱土及盐碱化土地中均含有较高的盐分，其中苏打草甸盐土表层含盐量1％～2％，硫酸盐草甸盐土表层含盐量可达1％～4％，草甸碱土含盐量一般。7％，来自于这些土地的地表径流和农田回归水中盐分含量高，可溶盐的输出负荷大。

Reduction of farmland may be caused by the need of setting up new sports centre or accommodation facilities.

减少的耕地可能引起的需要设立新的体育中心或住宿设施。

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上，利用各种方法求得各种逻辑型、结构型控制器，解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面，有讨论，工程理事会和联盟关于延长工作时间短至9月底。