water percentage of soil 中文意思是什麼
water percentage of soil
解釋
土壤含水百分比- water : n 1 水；雨水；露；〈常作 pl 〉 礦泉，溫泉；藥水。2 〈常 pl 〉水體；水域；水道；海；湖；河；海域；...
- percentage : n 1 【數學】百分法；百分數；百分比，百分率。2 比例，部分。3 【商業】手續費，傭金。4 〈俚語〉賺頭...
- of : OF ＝Old French 古法語。
- soil : n 1 泥土，土壤；土質。2 土地，國土。3 滋生地，溫床。4 農業生活，務農。n 1 臟東西，污物，污穢，污...
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Water content at field capacity is usually expressed as a percentage of the weight or volume of oven - dry soil
土壤含水量一般用干土壤的重量或體積百分比來表示，它受土壤質地的影響。 -
The results are summarized below : 1 ) study on soil science indicates that soil granular structure is the focus adjuster for soil fertility and it affects the space, water - grasp, aeration and anti - erosion of soil. and the percentage of aggregate is one of the key index that decides the speed and extent of soil erosion, hardening and degeneration because the soil degeneration will first lead to the disappearance of crumb - structure. so it is very important that the physical course and character of soil in different land use pattern are realized
現將主要結果摘要如下： l 、士壤學研究表明，團粒結構是土壤肥力的中心調節器，影響著土壤的空隙性、持水性、通透性和抗蝕性；任何土壤的退化首先將表現出團粒結構的消失；團聚體百分比是決定土壤侵蝕、板結等物理過程速度和幅度的關鍵指標之一，了解不同土地利用和土壤管理方式的物理過程和性質相當重要。 -
The dispersibility as well as seepage distortion and salt transference under long - term seepage condition of soil samples obtained from the clay core wall in xijiao and sanping reservoirs were studied by physical and chemical properties of soil and composition of clay mineral and the tests for identification of dispersive clay soils which included double - hydrometer test, pinhole test, crumb test, tests to defermine salt content of pore water and percentage of exchangeable sodium
摘要應用碎塊、針孔、雙比重計、孔隙水可溶鹽和交換性鈉百分比等五種試驗方法，結合物理化學性質和礦物成分分析，對西郊、三坪兩水庫大壩心墻土樣進行了多種方案的分散性試驗及長期滲流條件下的滲透變形試驗和鹽分運移試驗。 -
That favorable water environment benefited, not only by the rather large percentage of forest cover with quite strong capacity of water conservation in mountain areas, but also by the comparatively lower gravity of soil erosion in the loess plateau in the middle and lower yellow river basin while numerous lakes and swamps still existed at that time and maintained a huge water storage
中古華北之所以仍能保持良好的水環境，並非由於彼時降水遠比後代豐富，而是因為山區森林植被仍然良好，具有較強的水源涵蓄能力；黃土高原水土流失不甚嚴重，黃河決溢移徙較少、危害較輕，湖泊沼澤尚未因泥沙淤填而致大量消亡，可以瀦積巨量的水源。 -
The organic matter influenced > 0. 25 mm soil particle aggregation and > 0. 5 mm water - stable soil particle aggregation slightly and played an important role in the aggregation of > 5 mm water - stable soil particles. the percentage of aggregates destruction were remarkably negatively related with content of > 5 mm water - stable soil particle aggregate, and ultimately negatively related with > 0. 25 mm water - stable soil particle aggregate, which meant the content of water - stable soil particle aggregate dropped as the rise of percentage of aggregates destruction, the loosely fe took a role in increasing content of water - stable soil particle aggregate. the main factor that affecting content of > 0. 5 mm water - stable soil particle aggregate was percentage of aggregates destruction, whereas organic matter and percentage of aggregates destruction were the dominating matters that influencing content of > 0. 25 mm water - stable soil particl
粘粒含量在各級團聚體的形成過程中起著一定的作用；有機質對0 . 25mm團聚體、 5mm水穩定性團聚體有一定作用，對0 . 25mm水穩定性團聚體起顯著作用；團聚體結構破壞率與5mm水穩定性團聚體成顯著負相關，與0 . 25mm水穩定性團聚體達到極顯著負相關，說明結構破壞率越大，水穩定性團聚體的數量就越少，反之越多；游離鐵含量對促進水穩定性團聚體方面起一定的作用，影響0 . 5mm水穩性團聚體含量主要是結構破壞率，而影響0 . 25mm水穩定性團聚體含量的是有機質和結構破壞率。 -
Abstract : based on the dynamic response model of crop to water - salinity, the relation between crop growing and soil - salt movement is analyzed. the optimal design model of irrigation schedule for high yield, water saving and salinity control is proposed. it helps to promote the management of water saving and utilization of poor quality water. case study shows that the model is reasonable and practical, the percentage of fresh water saved is 31. 1 % and the crop yield is optimized
文摘:本文根據作物水鹽動態響應函數，分析了作物生長與土壤水鹽運動關系，建立了節水、控鹽、高產灌溉制度優化設計模型，為節水灌溉和微鹹水利用提供了決策依據.實例分析表明，本文提供的模型及方法是合理的；實施節水、控鹽灌溉制度能帶來明顯的經濟效益和環境效益
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