It is said that it is settled in the small woods of pine trees near Water Fall Lake. Sometimes it jumps joyfully in the woods or even enters the tall birch woods on the brae, or plays hide-and-seek with the tourists directly in the Lichee Woods, or even drinks water carefully under the osiers near the lake.

有人說它主要棲息在水濂湖畔的那片小松樹林里一a网大全在线，有人說它高興時(shí)還會(huì)竄到山坡上那一大排高高的樺樹林老年人日批的视频，或者就直接跟著游人在茂盛的荔枝林里捉迷藏，甚至還會(huì)趴在湖邊的柳樹腳下小心翼翼地喝水解渴欧美日韩第一区久久。

It is said that it is settled in the small woods of pine trees near Water Fall Lake. Sometimes it jumps joyfully in the woods or even enters the tall birch woods on the brae, or plays hide-and-seek withthe tourists directly in the Lichee Woods, or even drinks water carefully under the osiers near the lake.

有人說它主要棲息在水濂湖畔的那片小松樹林里中文自拍日韩视频在线观看网站，有人說它高興時(shí)還會(huì)竄到山坡上那一大排高高的樺樹林，或者就直接跟著游人在茂盛的荔枝林里捉迷藏免费无遮挡十八禁污污网站着，甚至還會(huì)趴在湖邊的柳樹腳下小心翼翼地喝水解渴网站三级视频。

Based on the eco- environment function, confirmed the constitution of eco- environment water demand(including the inside of the watercourse.and the ecological water demand of the outside of the watercourse such as ecological water demand of economical crop, of lake or reservoir and of cities.).③Analyzing the physical geography, hydrography, economy characteristic and water resource status, getting the proper calculation method. The Tennant applied to the eco- environment water demand of inside of the watercourse, woodland minmum eco- environment water demand calculation method applied to the eco- environment water demand of woodland, water ration method applied to farmland the eco- environment water demand, water evaporation method applied to the reservoir eco- environment water demand.

本文以流域生態(tài)環(huán)境需水為主要研究對象，因此重點(diǎn)闡述了流域生態(tài)環(huán)境需水量的分類和計(jì)算方法一级毛片免费网站看片；②通過分析流域生態(tài)系統(tǒng)構(gòu)成與流域生態(tài)環(huán)境功能www.91九色，并分時(shí)段和河段考慮，確定了桃花江流域生態(tài)環(huán)境需水量的組成久久精品国产2020超碰，即包括維持現(xiàn)狀河道生態(tài)環(huán)境功能現(xiàn)狀的現(xiàn)狀生態(tài)環(huán)境需水量與流域生態(tài)環(huán)境改善的生態(tài)環(huán)境需水量精品激情视频，前者包括河道內(nèi)生態(tài)環(huán)境需水量(維持河道基本生態(tài)功能需水量、維持河道自凈稀釋功能需水量在线日韩日本国产亚洲、補(bǔ)充地下水水量及美化流域景觀娛樂需水)與河道外生態(tài)環(huán)境需水量(流域內(nèi)植被www.99热、森林、農(nóng)田的需水量和與河道相連的池塘欧美大胆A级视频69、水庫等的需水量)九九视频精品在线；后者還包括為治理改善流域生態(tài)環(huán)境而擬規(guī)劃林業(yè)生態(tài)建設(shè)所需水量；③對桃花江流域的自然地理日韩亚洲性爱A片、水文地質(zhì)和社會(huì)經(jīng)濟(jì)特征以及水資源現(xiàn)狀及其主要生態(tài)環(huán)境問題進(jìn)行了綜合分析国内自拍第38页，提出了適合桃花江流域的生態(tài)環(huán)境需水量計(jì)算方法，即采用Tennant法計(jì)算河道內(nèi)生態(tài)環(huán)境需水量无码毛片高清网站，采用林地最小生態(tài)環(huán)境需水量法計(jì)算林地生態(tài)環(huán)境需水量免费特黄视频，采用需水定額法計(jì)算農(nóng)田生態(tài)環(huán)境需水量潮吹国产，采用水面蒸發(fā)法計(jì)算水庫、池塘生態(tài)環(huán)境需水量v在线观看欧美精品。

Taking Wuliangsuhai Lake,which is a typical shallow weedy lake lies in Hetao irrigate district in the north of China,as a research object,combining the measured water quality data with the spatial data,using the method of Principal Components Analysis based on factor analysis,the water quality parameters of WL are summarized into seven principal components,namely the index ...

以位于我國北方的河套灌區(qū)中的草型淺水湖泊烏梁素海為研究對象欧美在线精品一区二区三区，將實(shí)測的湖泊水質(zhì)監(jiān)測數(shù)據(jù)與空間數(shù)據(jù)結(jié)合，采用基于因子分析的主成分方法將烏梁素海的水質(zhì)參數(shù)概括為7個(gè)主成分AAA黄片免费，即：富營養(yǎng)化特征指標(biāo)好紧好深好大乳无码中文字幕、湖泊鹽化特征指標(biāo)、湖泊有機(jī)物污染指標(biāo)黄色午夜网站、湖泊形態(tài)特征指標(biāo)1024无码、水體酸堿指標(biāo)、水體藻類生物量指標(biāo)久久免费一级黄色视频、植物生長環(huán)境指標(biāo)一级黄色av。

Then siltation, now 15 meters water depth. B lake in order to maintain the water quality of West Lake.

后又淤積，現(xiàn)在水深15米又长又大又硬黄色。B為保持西湖湖水水質(zhì)黄片毛片av。

In this paper, two dimensional shallow flow—pollutants coupled model, which applies uninstructed grid finite volume method and Riemann approximate solver, is used to gain the trend of hydrodynamics and water quality change under the condition of driving force. Mechanism of nitrogen and phosphorous circle of WASP5 is considered in the water quality part of the model according to nutrition actuality of shallow lake in the cities.Xuanwu Lake is object of research in this paper.

本文針對城市淺水湖泊富營養(yǎng)化加劇現(xiàn)狀，結(jié)合WASP5模型中有關(guān)氮和磷的循環(huán)機(jī)理想看日韩网站，并將該機(jī)理寫入已有的二維淺水流體水量模型中加以耦合香蕉视频aaaa，應(yīng)用在無結(jié)構(gòu)網(wǎng)格下的有限體積法與黎曼近似解求解的方法，求解湖泊在外驅(qū)動(dòng)作用下的湖泊水動(dòng)力和水質(zhì)因子氮和磷的變化欧美福利午夜。

Brought forward and reasoned the forming mechanism of Maowusu sandy land. Based on the analysis of the development of Holocene rivers and related loess and windsandy geomorphology, the paper put forward the forming mechanism of Maowusu sandy land as follows: while the climate became dry, the exterior channels extended backwardly and cut through the remained lake system of ancient Hetao lake. This resulted in the rapid discharge of underground water. The vegetation living on this water resource was destroyed completely. Then the sand began to form.

對毛烏素沙地的形成機(jī)制進(jìn)行了新的探索基于對過渡地帶全新世河流及其相關(guān)的黃土和風(fēng)沙地貌發(fā)育亚洲精品456在线播放第1集、土地利用變化等分析，提出毛烏素沙地的形成機(jī)制：在氣候變干的同時(shí)国内下药视频在线观看，外流河谷溯源延伸538在线视频免费观看国产，切穿了長城以北河套古湖殘遺湖系，使地表地下水迅速外泄美女露出乳头和私处和男人日逼，原靠湖系水資源維系的生長在河套古湖湖濱沙堤形成的沙地上的非地帶植被的生存條件被徹底摧毀狼友在线视频在线播放，而起沙。

Here can see have high Li Gong Shan as ice snow the Great Wall main ridge, can watch the drop water river two waterfalls that have the reputation of " the cloudy mountain water of dartlike weapon " on mountain climb , reach the ice of high mountain to lose lake —— take order lake.

這里可以看到有如冰雪長城的高黎貢山主山脊美女操逼A∨，可以觀賞到有&陰山鏢水&之譽(yù)的滴水河雙瀑布日韩黄色AV网，往山上攀登，即可到達(dá)高山冰蝕湖——聽命湖久久久久国产精品熟女。

Due to food pressure, grain product in the western Jilin Province will be enhanced in the near future. Farmland areas in the area will be decreased slowly in the near future, but with the technique development of irrigation establishment, paddy areas and utilization amount of fertilizer and pesticides will be increased rapidly. So, the NPS pollution from farmland will be more serious. The main lakes in the areas such as Moon Lake and Qagan Lake have been polluted by N and P, and the content of salt in the Nenjiang River has been increasing since last 30 years. All of these show that the negative effects of NPS pollution in the area have been serious and should not be neglected by the scientific research and corresponding government management. To deal with the contradiction of agriculture development and water pollution, the trend of increasing paddy area and using amount of fertilizer, pesticide and herbcide in the western Jilin Province should be controlled. Also, the drainage of return flow from paddy should be controlled and return flow should be disposed with ecotechniques by use of the large areas of lakes and mires in the area. Through these measures, the quality of surface water could be protected and the degeneration of ecoenvironment in the area could be contained.

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