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土壤含水量变化
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  variation of soil water content
     In order to guide effectively to its application in the outdoors afforestation, the impacts of solid water on the growth of main tree species such as Pinus tabulaeformis and Platycladus orientalis used in northern China reforestation were studied in the green house by water status of the seedlings, variation of soil water content and quantity of microorganism etc.
     为了有效地指导其在野外造林的应用 ,在温室可控条件下 ,从植物水分状况、土壤含水量变化及微生物数量等方面 ,研究了固体水对北方主要造林树种油松和侧柏苗木生长的影响 .
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     (3) When the density of plant was 2933~3307 stubs/hm2 , the soil water content between surface and 40cm layer was 5.87%~7.24% in dry season and 12.60%~13.00% in rain season.
     (3)表层到40cm层土壤含水量变化范围为,当林分密度为2933~3307株/hm2时,旱季为5.87%~7.24%,雨季为12.60%~13.00%;
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     But soil depth in 60~80 cm and 80~100 cm,the change of soil water content is different.
     但在60~80cm,80~100cm土层,土壤含水量变化有所波动。
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     For the same slope aspect,the order of soil water contents in terms of altitudes was 2050m>1850m>(1450m)>1650 m.
     同一坡向不同海拔的土壤含水量变化为2 050 m处的最高,1 850 m处的次之,1 450 m处再次之,1 650 m处最少,表明了在干旱区河谷的两岸坡面上部土壤水分状况最好,在坡面下部靠近河流处次之,中下坡水分条件最差。
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     For vertical change, the soil water condition could be divided into three layers: vertiginous layer (0~20cm), active layer (20~40cm), and regulated layer (under 40cm).
     根据土壤深度及土壤含水量变化趋势,各林地土壤水分的垂直变化大体分为土壤水分速变层(0~20cm)、土壤水分活跃层(20~40cm)和土壤水分稳定层(40cm以下)。
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     (5)Soil water content of 10-15cm layer has big changes, and the larger depth’s changesmild.
     (5)浅层土壤 10-15cm土层土壤含水量波动大,而深层土壤含水量变化平缓。
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     Effect of soil moisture content on straw decompo-sing and its dynamic changes
     土壤含水量对秸秆分解的影响及动态变化
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     A Study on Soil Moisture Variation of Natural Populus Euphratica Forest Stand in Ejina
     额济纳胡杨林土壤含水量时空变化的研究
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     INFLUENCE OF WATER CONTENT ON SINKING RHEOLOGICAL PARAMETERS OF PADDY FIELD SOIL
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     Effects of water content variation on soil temperature process and water exchange
     含水量变化土壤温度和水分交换的影响研究
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     Change
     变化
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  variation of soil water content
The results revealed that the modified version of the SDGVM did a reasonable job of simulating the carbon and water flux and the variation of soil water content (SWC).
      
The within-field variability of these fluxes is strongly related to the spatial variation of soil water content.
      


The eggs of Locusta migratoria manilensis absorb a certain amount of water from the surrounding soil throughout their development, and then the water will be lost again as the soil moisture is very low. The rate of gain or loss of water is affected by temperature, being more rapid as the latter goes up. The susceptibility of eggs to desiccation in soil, taking percentage of hatching as a standard, varies with the stage of development of the embryos, being the least for newly-laid eggs, and the greatest for eggs...

The eggs of Locusta migratoria manilensis absorb a certain amount of water from the surrounding soil throughout their development, and then the water will be lost again as the soil moisture is very low. The rate of gain or loss of water is affected by temperature, being more rapid as the latter goes up. The susceptibility of eggs to desiccation in soil, taking percentage of hatching as a standard, varies with the stage of development of the embryos, being the least for newly-laid eggs, and the greatest for eggs which have their embryos in the overwintering stage. The increase in susceptibility to desiccation which occurred in eggs in overwintering stage is related mainly to the increase in water content within the eggs, for instance, eggs that have absorbed water give normal percentage of hatching under 30℃ constant temperature with only 2.5 per cent of soil water content, while for the newly-laid eggs, 8 per cent of water content is needed as a minimum. The stage of development of embryos is also important in relation to the susceptibility of the eggs to high temperature. Eggs with embryo in revolution stage have proved to be more enduring than those newly laid ones. But such susceptibility is affected by the water content of the surrounding soil. For newly laid eggs, it increases with the slight increase of water content from 3 per cent to 16 per cent. For eggs in overwintering stage, it decreases as the water content rises from 16 per cent to 30 per cent. Thermal death point for eggs in overwintering stage has been found approximately at 55℃, while for the newly laid eggs is somewhere about 50℃. The upper limit of optimal temperature for the development of eggs found in these experiments is 41.5℃ and may be slightly varied with the changes of soil moisture.

本实驗証明:蝗卵的耐干、耐热性能,常因胚胎发育阶段而異。已吸水的越冬卵,在30℃恆温下可以在2.5%含水量的土壤内正常孵化;未吸水卵在同样温度下,則需要土壤含水量在8%以上才能正常孵化。吸水卵在土壤含水量适宜的情况下,可耐受短期的高温(60℃);而未吸水卵只能耐受55℃以下温度的处理。二者发育的最高温度界限都在41.5℃左右,超越此限,蝗卵孵化率的递減梯度,除随温度上升的幅度而加大外,并与高温的持續时間和土壤含水量的变化有关。

Using an index of depletion coefficient of soil water,the dynamic processes of soil water at 15 plots in rainy season is analysed, and the empirical equations with depletion coefficient are derived.The results could be used to quantitatively evaluate the effects of vegetation, landforms, plantation measures on the depletion of soil water in rainy season of each year,and to estimate the rules of soil and water loss and the benefit of their conservation.

本文采用土壤含水量消退系数指标,对15个观测点的雨季土壤水分动态过程进行了计算分析,得出了消退系数的经验方程。研究结果可用于定量地评价该地区的植被、地形地貌、造林整地措施在雨季对各层土壤耗水能力的影响和预报雨季土壤含水量变化,还可用于定量地开展水土流失规律和水土保持效益研究。

The annual average rainfall in Lhasa area is about 432mm with 90% of them dis-tributing from June to September.Soil moisture was determined in the barren lands andthe non-irrigated section of wheat fields in Lhasa and Bclang county for 7 years in suc-cession.The results of which indicated that peak period of moisture contents was in therainy season and soil moisture recovering period.There is little change in soil moisturethrough the whole dry season so that soil humidity is relatively stable below 10cm soillayer.The...

The annual average rainfall in Lhasa area is about 432mm with 90% of them dis-tributing from June to September.Soil moisture was determined in the barren lands andthe non-irrigated section of wheat fields in Lhasa and Bclang county for 7 years in suc-cession.The results of which indicated that peak period of moisture contents was in therainy season and soil moisture recovering period.There is little change in soil moisturethrough the whole dry season so that soil humidity is relatively stable below 10cm soillayer.The total annual moisture consumption is 219-492mm,80% of which relativelyconcentrate on 4 months from June to September.The peak of soil moisture storage isone month prior to winter and rainy scason.Moisture contents in 0-50cm soil layer isclose to or reaches the field capacity so that rainfall can well meet the needs of crop waterrequirements,thus,indicating that the local basic conditions are favourable for carryingout rainfed agriculture.

拉萨地区年平均降水量约为432毫米,年降水量的90%分布在6—9月,通过在拉萨和白朗县累计7年的裸地及麦田非灌溉地段土壤水分测定看出,其土壤含水量的高峰期在雨季和土壤返浆期。整个旱季土壤含水量变化幅度较小。10厘米以下土壤湿度相对稳定;年度总耗水量为219-492毫米,总耗水量的80%相对集中在6-9月;土壤贮水量的高峰在冬前1月及雨季。0-50厘米土层含水量接近或达到田间持水量,降水可以满足作物对土壤贮水的要求,说明当地具有实施旱作农业的基本条件。

 
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