地下灌溉

And the crop water requirement coefficients based on Chinese Evaporimeter and the Crop Coefficients Kc were estimated accordingly.

田间试验设置在灌水定额相同的情况下，灌水方式和灌溉水质(加入0，10和20%的地下咸水)对灌水沟中土壤剖面盐分累积和玉米产量及地下水位的影响。

Subsurface drip irrigation is one of effective irrigation methods. But it is easy to clog.

地下滴灌是一种高效的节水灌溉技术，但系统易于堵塞，堵塞问题成为影响地下滴灌成败的关键。

The impacts of intensity of agriculture activities, landuse change and irrigation system change upon underground water were analyzed based on more than 20 years' hydrochemical data.

以贵州普定后寨地下河流域为例，利用20余年的水化学系列资料，分析了农业活动加强、土地利用方式及灌溉系统改变对地下水的影响。

As the Yayoi population explosion continued, and as all the best swamps or irrigable plains suitable for wet rice agriculture began to fill up, the archeological evidence suggests that war became more and more frequent: that evidence includes mass production of arrowheads, defensive moats surrounding villages, and buried skeletons pierced by projectile points.

随着弥生时期人口爆涨的继续，及所有适合水稻农业的优质湿地和可灌溉平原被占用，考古学证据显示战争开始变得越来越频繁：证据包括箭镞的大规模生产、环绕村庄的防御用壕沟和埋于地下的被尖锐抛射体扎穿的骨架。

The Ogallala Aquifer, one of the world's largest stores of groundwater, covers 225,000 square miles beneath parts of eight U.S.

奥加拉拉蓄水层是全球较大的地下水储层，面积225000平方公里，涵盖了美国德克萨斯州至南达科他州八个州的地下土层，是该国五分之一农田的灌溉源。

NO3--N pollution in drinking water at the depth of 20 m is serious with common and serious overproof rates of 39.3% and 7.1% respectively. NO3--N content in irrigation water for farmland and greenhouse at the depth of 40 m is 7.4 mg·L-1 and 9.6 mg·L-1 with respective common overproof rates of 25.0% and 37.5%, and zero serious overproof rate.

设施蔬菜栽培区表层地下水(地下饮用水， 20 m)受硝态氮污染严重，超标率和严重超标率为39.3%和7.1%；而深层地下水(农田和大棚灌溉水， 40 m)硝态氮含量7.4 mg·L-1和9.6 mg·L-1，超标率分别为25.0%和37.5%，无严重超标水样。

NO3(superscript -)-N pollution in drinking water at the depth of 20 m is serious with common and serious overproof rates of 39.3% and 7.1% respectively. NO3(superscritp -)-N content in irrigation water for farmland and greenhouse at the depth of 40 m is 7.4 mgL^(-1) and 9.6 mgL^(-1) with respective common overproof rates of 25.0% and 37.5%, and zero serious overproof rate.

设施蔬菜栽培区表层地下水（地下饮用水，20m）受硝态氮污染严重，超标率和严重超标率为39.3%和7.1%；而深层地下水（农田和大棚灌溉水，40m）硝态氮含量7.4mgL^(-1)和9.6mgL^(-1)，超标率分别为25.0%和37.5%，无严重超标水样。

The results of saline water irrigation (1990~1995) showed that the yields of wheat, corn, cotton and grain increased 30% more than those of non-irrigated crops. In the condition of spring irrigation and concentrated rainfall, the soil desalinized in root zone, and the accumulated salt due to saline water irrigation can be leached; reasonab...

三坝浅层地下咸水灌溉试验( 1 990～ 1 995)的研究结果表明，利用 3.0～ 5.1 g/ l的咸水灌溉小麦、玉米、棉花和高粱，均比不灌的增产 30 %以上；在春季河灌和汛期集中降雨淋洗的条件下，作物根层土壤不积盐；实行咸淡水轮灌，增辟水源，改善水质，可获作物增产。

In abandoned land and peripheral desert of oasis, influenced by irrigation of oasis, groundwater table has been raised above the critical depth.Because the soil salt cannot be eluviated by irrigation water and precipitation, salt brought to the upper layers of soils by strong evaporation is especially concentrated on soil surface.

绿洲内的撂荒地和靠近绿洲的荒漠草地受绿洲内部灌溉过程的影响，地下水位升高，超过了地下水的临界深度，同时又因为缺少灌溉的反复淋洗，在强烈的蒸发作用下，盐分的表聚现象十分明显，而且整个剖面内盐分的含量都较高，土壤的盐渍化现象非常严重。

The invention of the Karez, which is an irrigation system of wells connected by underground channels, in Xinjiang provided useful experience for irrigation in the northwest region of our country and has been extended to other drought-stricken areas.

坎儿井，新疆的一个由地下通道连接井灌溉系统的发明，为我国西北地区灌溉提供了宝贵的经验，并已扩展至其他旱区。

The basic concept of FOP can be summarized as to further optimize effective prescription according to the standard of curative effects and with the aid of modern science and technology and theories of traditional Chinese medicine.

其基本内涵可概括为：以确有疗效的中药复方为研究对象，以现代科学技术和传统中医药理论为技术支持，以该复方所治病证的药效响应为评价标准，以优化重组疗效更优的新复方为研究目的。

Ever since our world has been a world, native forests have been indiscriminately exploited by man.

自从我们的世界一直是世界原生森林被任意剥削人。