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field capacity 土壤容水量。

field corn

The lower limits of soil moisture for rational deficit irrigation scheduling to cotton at its different growth stages are 55 60 , 65 , 70 and 50 55 of field capacity at seedling , buds , bolls and wadding stages , respectively 合理的棉花調虧灌溉制度是苗期控制水分供應,土壤含水量維持在田間持水量的55 60 ;蕾期和花鈴期是棉花的需水關鍵期,土壤含水量應分別保持在田間持水量的65和70左右;吐絮期應控制水分供應,土壤含水量維持在田間持水量的50 55 。

Moreover , according to different land use types , bulk density shows the lowest value for the woodland while the highest value for the grassland and the subsoil of farmland , saturated soil moisture and field capacity exhibit the highest values for woodland while the lowest for the grassland and the subsoil of farmland , and the wilting moisture in woodland is also the highest and that in the farmland is the lowest 不同土地利用類型土壤物理性質也存在顯著差異,容重以農地亞表層和草地較大,林地較小;飽和含水量和田間持水量以林地較大,農地亞表層和草地較小;萎蔫濕度則以林地較大,農地和果園地較小。

The physical and chemical properties of the soil were analyzed , including nutrient change and routine index of acidity and alkalinity , in addition , compared them with natural soil and studied their variation and correlation . the results as follows : the soil bulk density of harbin urban vegetation is higher , total porosity and field capacity are small 對其土壤的理化性質和養分狀況等指標進行分析,并與松花江地區自然黑土進行了對比,研究其變化的趨勢和養分相關性。結果表明:哈爾濱城市綠地土壤容重較大,孔隙度和田間持水量少,有機質缺乏,養分含量較低,相關性差,土壤ph值呈中性,肥力水平低。

It was found that the soil physical properties had significant spatial variability in the catchment scale because of the joint - influences of land use , topography , physiognomy , and other factors . the spatial variation is small for field capacity , moderate for wilting moisture and bulk density , and great for saturated soil moisture 受地形地貌和土地利用等因素的綜合影響,土壤物理性質在流域尺度內存在顯著的空間變異,飽和含水量的空間變異性最大,土壤萎蔫濕度和土壤容重居中,田間持水量空間變異最小。

The soil physical properties have obvious vertical distribution characteristic in the slope . the bulk density in sunlit slope is greater than it in sunless slope , and change in the follow order in the slope : top < middle < lower . while saturated soil moisture , field capacity , and wilting moisture are on the contrary 在地形上,土壤物理性質具有明顯的垂直分布規律,陰坡除土壤容重外,飽和含水量、田間持水量和萎蔫濕度均大于陽坡;同一坡度和坡向下,容重從坡下向坡上遞增,飽和含水量、田間持水量和萎蔫濕度均從坡下向坡上遞減。

The objectives of this study are : ( 1 ) collect the basis data about soil physical properties , soil moisture , infiltration and evapotranspiration in the catchment scale for developing a catchment hydrological model , based on the dtm , ( 2 ) provide the hydrological information in the catchment scale for developing agricultural production , vegetation rehabilitation , and reasonable land using in this region . the main conclusions drawn from this study are : ( 1 ) the soil physical properties , including bulk density , saturated soil moisture , field capacity , and wilting moisture , were measured at 56 plots across the catchment 為此,本文以黃土高原溝壑區典型小流域?王東溝為研究對象,通過大量的野外測定和室內分析,系統研究了流域土壤容重、土壤飽和含水量、田間持水量、萎蔫濕度、土壤入滲性能、土壤含水量和蒸散量的空間變異性,以期為該區農業生產、植被恢復和土地合理利用等提供科學的依據,同時為建立基于數字高程模型( dtm )為基礎的流域水文模型積累基礎資料。

According to physiognomy , the bulk density changed as the following order : upland > hills > hillslopes > gully slopes , the saturated soil moisture arranged as : hillslopes > hills > gully slopes > upland , while field capacity and wilting moisture are as follows : gully slopes > hills > hillslopes > upland 在地貌上,土壤容重呈現出塬面梁頂溝坡梁坡,飽和含水量呈現出塬面溝坡梁頂梁坡,田間持水量和萎蔫濕度均呈現出溝坡梁頂塬面梁坡的趨勢。

The field capacity and porosity increase gradually and bulk density decrease gradually . the significance linear regression between the field capacity and soil organic matter is discovered as well as porosity and bulk density 此外,隨植被演替, 0 5cm土層田間持水量和孔隙度逐漸增加, 0 5cm土層容重逐漸降低,且均與有機質含量呈顯著線性正相關。

The coefficient of variation of saturated water content decreased with the depth of profile . the coefficient of variation of bulk density and field capacity fluctuate with depth of soil 飽和含水量的變異系數都隨深度的增加逐漸降低,含水量、容重和田悶持水量的變異系數隨深度的呈波動變化。

Bulk density in 0 ~ 20cm , 20 - 40cm and field capacity in 20 ~ 40cm can be simulated with pure nugget effect model , and they are not spatially correlated in sampling scope . 4 O ~加cm 、 20一40cm土壤容重和2 } 40cm田間持水量符合純塊金效應模型,說明在采樣范圍內它們的空間相關性不存在。

In conclusion , the variable degree of the soil water properties and bulk density in different layers is water content > wilting point > field capacity > saturation > bulk density 總的來看,各水分特性在剖面各層的變異情況為:含水量>萎蔫含水量>田間持水量>飽和含水量>容重。

The threshold value of soil water contents for photosynthesis and stomatal resistance is about 14 ( 0g ) , i . e . , 60 65 of field capacity 棉花的光合速率和氣孔阻力隨土壤含水量變化的閾值約在14土壤含水量水平,該閾值相當于田間持水量的60 65 。

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。

Field capacity the point at which the soil contains all the water it can hold by capillary and chemical attraction 田間持水量:土壤通過毛細作用和化學吸力可維持的全部水量。

Any more water added to soil at field capacity would drain away by gravity 超過田間持水量的所有添加的水分的都會由于重力作用而流失。

Field capacity field moisture capacity 田間持水量

Soil at field capacity has a high water potential 土壤處于田間持水量時通常有很高的水位。

Field capacity is a property of a unit volume of soil . 野外容水率是單位土體的一種特性。