水位降低

Soil secondary salinization, it can lowerer the underground water lever and ejecter the soil salt in

为了防止土壤次生盐渍化，良好的排水系统是非常重要的，它可以降低地下水位和排出土壤盐分，做到灌排配套。

The results show that rising of groundwater levels after water transportation plays an important role in the decreasing in the crown loss of Populus euphratica, and the crown loss of Populus euphratica gradually increases with increasing distance from the river course. The trees crown loss was less than 10%, which mainly was distributed within 100 metres to each side from the river course. The proportion of crown loss of overmature and effete forests were 50%-75% within 200 to 400 metres.

应急生态输水后地下水位的抬升对胡杨树冠疏失度的降低产生一定的作用；总体上，胡杨的树冠疏失度随着离河道距离的增加逐步增大，而且离河道越远，疏失度增加的程度就越大；树冠疏失度小于10%的旺盛胡杨主要分布在离河道100m之内，其中多以疏失度少于50%的长势较好的胡杨为主。

Therefore, the reduction of the water level in this irrigation district is an important measure to control the soil salinification and it is a key to realize the agricultural sustainable development.

因此，有效降低该灌区地下水位是控制土壤盐化的重要措施，是实现农业可持续发展的关键所在。

Result showed that, with the controlled facility, the water storage is about 19×10^3 m^3/km of in the main drainage canal, the groundwater table in farmland is raise about 0.3 to 0.5 m and the crop water use is increased about 50 to 80 mm comparing with the non controlled main drainage canal.

结果表明，单位长度大沟年调蓄水量为1.9×10^4立方公尺/km左右，其影响范围内的农田地下水位较无控制大沟平均抬高约0.3~0.5 m，每年可增加作物对地下水的直接利用量50~80 mm，区域年农田水资源调控总量110 mm左右，约占当地年均降雨量的13%；只要控制合理、管理得当，不会因此而影响排水系统对农田涝渍的有效控制或降低原有排水工程的除涝降渍标准。

Troubleshooting: plug removal and replacement of fill, dredge water pipe trench, the correct installation of seal ring; fastener or replacement of the impeller; reduce pump installation, or when the water level rose after the boot.

排除方法：清除堵塞物，更换填料、疏通引水管沟槽，正确安装水封环；紧固或更换叶轮；降低水泵安装位置，或待水位上升后再开机。

The numbers of bacterium are less affected by the anaerobic condition in soil while the number of fungi and actinomyces in soil drop down a lot and the micro biomasses change with the same trend at the mean time.

这是本研究对有机残体分解机制的新发现。淹水对细菌数影响不大，放线菌、真菌数量则明显地受土壤氧分压变化的影响，当土壤氧分压降低时，放线菌和真菌数量从低水位时的高积累量锐减。

Drainage may be installed in order to lower the ground water table and remove the pore water.

排水可安装在地上，以降低水位，排除孔隙水。

Filter to backwash level –During this step, the compressed air at 30 psi (200 kPa) is introduced into the shell side to drive the filtration and lower the shell side feed water level.

过滤反冲洗水平–在这个步骤中， 30 psi (200 千帕)的压缩空气被引入壳侧来驱动过滤并降低壳侧的给水水位。

The backwash sequence includes the following steps: Filter to backwash level –During this step, the compressed air at 30 psi (200 kPa) is introduced into the shell side to drive the filtration and lower the shell side feed water level.

反冲洗路线包括下述步骤：过滤反冲洗水平–在这个步骤中， 30 psi (200 千帕)的压缩空气被引入壳侧来驱动过滤并降低壳侧的给水水位。

Though natural in appearance, the water level is lowered in June and September to provide mud flats for migrating shorebirds.

六月和九月人为降低水位，为迁移的岸鸟提供泥层，但这看起来很自然。

I'm strongly against the death penalty — it's an eye for an eye.

我不赞成死刑——这是以牙还牙的报复行为。

And to get you the support you need, we're enlisting all elements of our national power: our diplomacy and development, our economic might and our moral suasion, so that you and the rest of our military do not bear the burden of our security alone.

并给你们所须的支援，我们正徵召国家所有各种的力量：我们的外交及发展，我们的经济力量与道德劝说，所以你们与其他军人不须要孤独地负起国家安全的责任。