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

為了防止土壤次生鹽漬化国产AV无码中文，良好的排水系統(tǒng)是非常重要的，它可以降低地下水位和排出土壤鹽分少妇被黑人4p到惨叫欧美人，做到灌排配套亚洲无码精选。

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.

應(yīng)急生態(tài)輸水后地下水位的抬升對(duì)胡楊樹冠疏失度的降低產(chǎn)生一定的作用；總體上5566在线视频，胡楊的樹冠疏失度隨著離河道距離的增加逐步增大尤物成人最新电影在线观看免费网站，而且離河道越遠(yuǎn)，疏失度增加的程度就越大永久黄色视频；樹冠疏失度小于10%的旺盛胡楊主要分布在離河道100m之內(nèi)西西WWW大胆高清视频，其中多以疏失度少于50%的長(zhǎng)勢(shì)較好的胡楊為主。

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.

因此国产在线黄色小，有效降低該灌區(qū)地下水位是控制土壤鹽化的重要措施日韩精品欧美精品国产精品，是實(shí)現(xiàn)農(nóng)業(yè)可持續(xù)發(fā)展的關(guān)鍵所在。

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.

結(jié)果表明欧美性多多，單位長(zhǎng)度大溝年調(diào)蓄水量為1.9×10^4立方公尺/km左右扒开双腿疯狂进出爽爽爽网站，其影響范圍內(nèi)的農(nóng)田地下水位較無控制大溝平均抬高約0.3~0.5 m，每年可增加作物對(duì)地下水的直接利用量50~80 mm性xxxx淫乱，區(qū)域年農(nóng)田水資源調(diào)控總量110 mm左右人人操人人湿人人干，約占當(dāng)?shù)啬昃涤炅康?3%；只要控制合理日韩色情精品一区-AV、管理得當(dāng)欧美一级在线观看欧美大片，不會(huì)因此而影響排水系統(tǒng)對(duì)農(nóng)田澇漬的有效控制或降低原有排水工程的除澇降漬標(biāo)準(zhǔn)思思99思思久久最新精品。

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，更換填料jjzz中国jjzz、疏通引水管溝槽黄色无码丝袜视频，正確安裝水封環(huán)；緊固或更換葉輪亚洲一区二区三区a片；降低水泵安裝位置亚洲三级片免费看视频，或待水位上升后再開機(jī)。

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.

這是本研究對(duì)有機(jī)殘?bào)w分解機(jī)制的新發(fā)現(xiàn)一区二区亚洲黄色网站。淹水對(duì)細(xì)菌數(shù)影響不大欧美精品AAAAAAA，放線菌、真菌數(shù)量則明顯地受土壤氧分壓變化的影響中国农村第一黄片视频，當(dāng)土壤氧分壓降低時(shí)久久精品中文字幕乱码…，放線菌和真菌數(shù)量從低水位時(shí)的高積累量銳減。

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

排水可安裝在地上热久久中文字幕少妇，以降低水位免费一级毛片视频,，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.

過濾反沖洗水平–在這個(gè)步驟中亚洲色淫淫网， 30 psi (200 千帕)的壓縮空氣被引入殼側(cè)來驅(qū)動(dòng)過濾并降低殼側(cè)的給水水位国产永久视频。

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.

反沖洗路線包括下述步驟：過濾反沖洗水平–在這個(gè)步驟中， 30 psi (200 千帕)的壓縮空氣被引入殼側(cè)來驅(qū)動(dòng)過濾并降低殼側(cè)的給水水位国产精品久久久狼友。

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

六月和九月人為降低水位欧美一级夜夜爽老妇，為遷移的岸鳥提供泥層，但這看起來很自然男人天堂网址在线。