variation of water quality 中文意思是什麼
variation of water quality
解釋
水質變化-
In recent years, the water - saving and control irrigation technique of rice has diverted from plot experimental and demonstration to lare scale. and has got remarkable economic and social benefits. amed at the characteristics of this irrigation area, optimal selection for water - saving techniques of rice, deciding the amout of leaching water and irrigation modles, investigating the adaptability of the water - saving and control irrigation technique in saline land. studying the increase in production mechanism of the technique are important to extend the technique, to better and develop saline land as well as slick spots. according to the results of field experiments, optimization study was conducted on the water - saving irrigation technique of rice in saline land, the effects of different water - saving irrigation techniques on the physiological indexes and yield of rice were systematically analyzed. by using mutiplepurpose fuzzy optimization method, better. water - saving irrigation technique was selector out, that is. the control irrigation technique in rice. the mechanism of it was analyzed from the aspect of the physiological and ecological saving water of rice to provide the implemental process and technical point ; throgh the quantitive analysis and comparision on control irrigation and control class ( flood irrigation ), high production and quality mechanism of the technique was analyzed in terms of physiology indexes of rice, the variation of soil moisture, the pest resistance and the lodge resistance, the change of soil temperature in paddy fields. the yield constitutive factors, the quality of rice and so on. in saline land. control irrigation and intermittent leaching modles were adopted to validate the adaptability of the technique in irrigation of rice in saline land, to analyze rice ' s physiological - ecological indexes and the change of soil salt content under the conditions of control irrigation leaching of rice and and to provide control irrigation and combined modle of intermittent leaching to adapt to different conditions
本文從試驗及試驗資料入手，取得以下主要成果和結論：對鹽堿地水稻節水灌溉技術進行優化研究，系統地分析了不同節水灌溉技術對水稻生理指標及產量的影響，採用了多目標模糊優化的方法，對灌水技術進行綜合評判，優選了節水灌溉技術，論證該地區宜採用水稻控制灌溉技術；闡述控灌技術通過調節和控制水稻的需水規律，降低水稻高產情況下的無效水量消耗，從水稻生理、生態節水兩方面分析了控灌技術節水機理，針對性地總結出水稻各生育期實施節水控灌技術的步驟及技術要點；通過控灌與淹灌的定量對照比較，從根系、莖蘗、冠層葉片及綠葉動態到株高，土壤水分變化，抗病蟲害、抗倒伏能力，稻田土溫變化，產量構成因素及稻米品質等諸多方面進行動態比較，分析控灌技術高產優質機理；在鹽堿稻地採用控制灌溉+間歇淋洗模式，跟蹤測試田間水鹽變化狀況，驗證控制灌溉技術在鹽堿地區水稻灌溉中應用的適應性，通過分析水稻控制灌溉淋洗條件下水稻生理生態指標，提出優化控制灌溉+間歇淋洗組合模式，為進一步在高礦化度地區試驗水稻控灌技術奠定基礎。 -
For this reason, to analyze the spatial and temporal dynamic of ground water table and water quality beneath the typical phytocommunity in particular areas, will be helpful to probe into the dynamic formation of soil moisture and salinity, and to understand the spatial variation of vegetation
因此，分析區域內典型植物群落的地下水水位、水質在時空上的動態變化，有助於探討土壤水鹽動態變化的形成條件，揭示植被在空間上梯度變化的原因。 -
The effect of variation in surge shaft section size upon the reflection of water hammer pressure and the speed of quality fluctuation attenuation
調壓井斷面尺寸變化對水錘壓力反射及質量波動衰減速度的影響 -
The special regularity of water quality variation in the river during the irrigation period was presented, i. e. water quality deteriorates at the beginning of water supply and will gradually be improved to a steady state
結果表明：灌溉期水庫供水時，河流水質有其特殊的變化規律：供水初期水質惡化，然後水質逐漸好轉並趨于穩定。 -
This dissertation is about one - year ' s study of fuzhou ' s inner river in community ecology of zooplankton, which evaluated the water quality of this river through the analysis of the structure variation of its zooplankton community and combining with the physical and chemical indexes, then may give some suggestions to the rational and efficacious measures of fuzhou ' s inner river management
對福州內河進行為期一周年的浮遊動物群落生態研究，以期利用浮遊動物群落結構變化，結合理化指標對福州內河進行水質綜合評價，為福州內河合理、有效的治理提供基礎資料。 -
Spatial variation trend and assessment of sea water quality of mariculture zone in honghai bay, guangdong province, china
紅海灣水產養殖示範區水質綜合評價 -
This article makes a model test research to filter function of porcelain sand filter according to the new material - porcelain sand filter - that baogang uses in the new water processing technology of sheet semifinished turbidity of the inlet water, different medicine and variation of outlet water quality in different filter velocity
本文針對包鋼薄板坯連鑄連軋新水處理工藝中所採用的新型濾料? ?瓷砂均質濾料的過濾特性進行了研究。在不同的進水濁度、不同的加藥量、不同的濾速下出水水質的變化，對瓷砂濾料過濾性能進行了模型試驗研究。
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