Separately speeking, for outward rivers in Cansu (either to the Yellow River or to the Yangtze River), the allocable water resources are mainly the river runoff and groundwater, the priority sequence of water resources allocation would be: the water use for maintenance of local plantation including the environment-oriented and irrigated ones, water use for social and economic activities, and the runoff to lower reaches.

外流河流域的降水首先為當(dāng)?shù)氐闹脖缓挠萌蘸琅镁镁梦蘼穑Ｓ嗟牟判纬煽晒╅_發(fā)的地表徑流和地下水；水資源配置的順序是：當(dāng)?shù)刂脖缓乃面貌俨賐，?dāng)?shù)厣鐣?huì)經(jīng)濟(jì)用水疯狂欧美黑粗硬大插进去了，最后形成干支流出境的徑流供中下游地區(qū)使用。

The root biomass improved the soil infiltration rate and reduced runoff,the runoff and erosion amount of meadow brome decreased by 98.2%and 99.9% respectively,and the ability of water retention and soil-reinforcement of meadow brome was 5.2 and 1.5 times than that of corn.

同時(shí)激情另类小说，草地雀麥010 cm土層根系發(fā)達(dá)一级黄色片美国，地下生物量是玉米的2.88倍，可以顯著提高自然降水的土壤入滲率最新热播无码视频。，減少地表徑流免费黄色视频A片子，使坡地年徑流量與土壤侵蝕模數(shù)減少98.2%和99.9%，保水国产初高中精品网、固土能力是玉米種植的5.2倍和1.5倍欧美一级abbb，水土流失防治效果顯著。

The effect of Zea mays and Bromus riparius on soil and water loss were studied,the experiment was conducted to plant crop and grass in runoff-plots on the 15 degree slope naturally,the bare slop is CK,then the runoff and soil erosion amount and the biological characteristics of corn and meadow bromes termly were measured,and difference of soil and water loss prevention effect on the slop land were determined.The results showed that soil and water loss became less after both corn and meadow brome planting.And the leaf area and the coverage of meadow brome higher than corn,which was benefit for less soil and water loss at the rain season early.Meanwhile,roots of corn and meadow brome mainly distributed in 0-10 cm soil layer,and the root biomass of meadow brome was 2.88 times than that of corn.

試驗(yàn)在自然降雨條件下鲁在线视频，在15°坡地設(shè)置作物與牧草徑流試驗(yàn)小區(qū)欧美性爱免费看视频，以裸地為對(duì)照，在每次降雨之后用全深剖面采樣器取樣，測(cè)量其徑流量和土壤侵蝕量欧美三级电影网址，定期測(cè)定玉米和草地雀麥的生物學(xué)特性人人操一区，研究玉米與草地雀麥生物學(xué)特性變化及其坡地水土流失防治效果的差異，探索植物種植對(duì)坡地水土流失的主要影響因素欧美视频性交，結(jié)果表明：種植玉米與草地雀麥日韩在线精品色欲视频观看免费网站，對(duì)坡地水土流失均有一定防治作用，但是国产精品资源站没想到这么骚，與玉米相比狼友视频在线观看的，草地雀麥的葉面積指數(shù)和覆蓋度可在雨季前達(dá)到較高水平，有利于早期坡地水土流失防治欧美人牲交免费黄色一级片爱情就爱。

In the Yellow River and Dadu River a trend of increase in runoff has appeared, but in most rivers the runoff has still fluctuated below normal since the e...

據(jù)黃河流域徑流對(duì)氣候變化的敏感性分析，如果氣溫升高2℃中文字幕网站在线观看，即便降水量增加20％国产一级婬片A片免费无码，該流域的夏季徑流量也將減少3％左右。

The results showed that covering the dich slopes with shrub could significantly increase soil shear strength, compactness and moisture content, and the formed vegetation had significant effects on retarding runoff and removing TSS (P.05). Applying live fascines could significantly increase soil shear strength and TSS removal rate (P.05), but its effects on increasing soil compactness and moisture content and retaining runoff were not significant.

結(jié)果表明：與對(duì)照相比日韩午夜在线试看网站免费视频，使用灌叢墊技術(shù)修復(fù)后的坡岸土壤剪切力老司机日韩精品伦理片、緊實(shí)度和土壤濕度顯著提高(P.05)，坡岸植被延緩徑流和去除懸浮物效果顯著(P.05)好痛好爽高潮来了视频在线观看；使用柴籠技術(shù)修復(fù)后的坡岸土壤剪切力和懸浮物去除率顯著提高(P.05)99ri视频精品这里精品，但對(duì)土壤濕度、緊實(shí)度和雨水徑流的延滯作用不太明顯国产免费午夜福利天堂AV。

It collects the data of sediment discharge and runoff depth of key hydrometric stations of the Yellow River and its main tributaries in the last 50 years and studies the normal variation of absolute value of sediment discharge and relative runoff depth by using mathematical statistics.

收集了黃河重要干流水文站和一些主要支流近50年的輸沙量及徑流量數(shù)據(jù)色五月综合网，應(yīng)用數(shù)理統(tǒng)計(jì)方法研究了輸沙量絕對(duì)值和相對(duì)徑流量的多年變化情況。

And according to the characteristics ofunderlaying surface of catchments and that of runoff, the variation of impoundage was takeninto consideration in runoff model.

并通過分析流域下墊面和徑流特點(diǎn)性爱五月，考慮了土壤蓄水容量的變化欧美乱伦视频二区，進(jìn)一步認(rèn)識(shí)流域水文循環(huán)變化規(guī)律，提高了洪水預(yù)報(bào)精度99热爱精品九九九九。

The research quantified the effects of geographical environment factors about runoff and sediment generation to provide rationable foundation to differentiate cell of runoff and sediment generation and to the construction of ecological environment in a watershed.

定量評(píng)價(jià)影響渭河流域產(chǎn)水在线产国产、產(chǎn)沙的地理環(huán)境要素因子，為渭河流域產(chǎn)水av大陆老熟女性爱、產(chǎn)沙格局劃分及流域生態(tài)環(huán)境建設(shè)提供理論依據(jù)玖玖视频在线精品。

During the establishment of sediment yield dynamic model at the watershed outlet, it was difficult for us to carry out dynamic monitoring of each impact factors in the whole basin, because it was a long time research and was in very large-scale watershed. Taking into account the interannual variability of sediment yield mainly affected by hydrological conditions of rainfall - runoff and underlaying surface changes caused by soil conservation measures, a combined influence factor which is related to surface runoff modulus and the implementation time of the water and soil conservation project was proposed for the first time. Furthermore, its specific expression was determined through dimensional analysis and non-linear regression multianalysis.

在流域輸沙量動(dòng)態(tài)模型的建立中，由于研究時(shí)段長(zhǎng)国产日韩精品自拍AV、研究流域尺度大亚洲色无码一区二区三区，對(duì)輸沙量各影響因子進(jìn)行全流域逐年動(dòng)態(tài)監(jiān)測(cè)十分困難，考慮輸沙量的年際變化主要受降雨-徑流水文條件和水土保持措施等土地管理活動(dòng)的影響全黄a一级毛片，首次提出與地表徑流模數(shù)和治理時(shí)間相關(guān)的綜合影響因子国产宅男精品，并通過因次分析法和二元非線型回歸法確定了具體的表達(dá)式。

Wavy distribution of soil water along hillslope resulted from the fluctuation of runoff, upslope runoff infiltration, lateral downslope flow, and the difference of infiltration rate and evapotranspiration.

4土壤水分沿坡面呈&波浪形&分布是坡面徑流的波動(dòng)性、上方來水的沿程入滲久一精品、側(cè)向沿坡向下流以及坡面各處入滲性能和蒸發(fā)蒸騰作用的差異等綜合作用的結(jié)果A级毛片高清免费网站不卡。