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This paper is an elementary study of tomato consumption rules, the air temperatures and humidity, and soil temperatures under drip irrigation planting in green house of sunshine in the Yucheng district of Shandong province. The results show that the temperature can be kept about 18℃ while the temperature differences being to 20℃ in deep winter, Which is satisfaction of growth demand of tomato.There are good relationships for evaporations of water surface and water demands of the crops with irrigation quantities...

This paper is an elementary study of tomato consumption rules, the air temperatures and humidity, and soil temperatures under drip irrigation planting in green house of sunshine in the Yucheng district of Shandong province. The results show that the temperature can be kept about 18℃ while the temperature differences being to 20℃ in deep winter, Which is satisfaction of growth demand of tomato.There are good relationships for evaporations of water surface and water demands of the crops with irrigation quantities in green houses, which is can be used to guide practice.

:对山东禹城地区采用滴灌灌溉的番茄 ,在日光温室内 1-4月份生长的耗水规律及空气温度、空气湿度和地温等环境因素进行了初步的研究。结果表明 ,在严冬季节不用加温条件下 ,日光温室内的平均温度可维持在18℃左右 ,内外温差达 2 0℃左右 ,可基本满足番茄生长发育的需求。将滴灌带下 15cm处的土壤水势维持在番茄生长的适宜范围 (≥ -2 0kPa) ,日光温室内的水面蒸发量与作物的需水量和灌溉水量存在很好的一致关系 ,因此 ,可将日光温室内的水面蒸发量作为指导灌溉的灌溉量

Field experiment of saline water drip irrigation for watermelon and honeydew melons was conducted in Hetao region of Inner Mongolia, China. The water requirement which indicates the favorite water consumption for growth under different conditions of water application were obtained from the observation data measured by lysimeters and calculated according to the water balance theory. The reference crop water requirement can be calculated from the evaporation measured by evaporimeter. On this basis the crop coefficients...

Field experiment of saline water drip irrigation for watermelon and honeydew melons was conducted in Hetao region of Inner Mongolia, China. The water requirement which indicates the favorite water consumption for growth under different conditions of water application were obtained from the observation data measured by lysimeters and calculated according to the water balance theory. The reference crop water requirement can be calculated from the evaporation measured by evaporimeter. On this basis the crop coefficients reflecting the effects of crop characteristics, crop yield level, soil condition and method of cultivation on crop water requirement can be deduced according to the relationship between measured water requirement and reference crop water requirement.

在采用测渗仪测得内蒙古河套地区进行的西瓜、蜜瓜咸水滴灌田间试验的数据,利用水量平衡原理,计算出在不同灌水量条件下的耗水规律,得出作物在适宜生长条件下的耗水量,即作物需水量。根据美国A级蒸发皿和中式皿的自由水面蒸发量的关系以及美国A级皿的蒸发量和参照作物需水量之间的关系,推算出了作物各生育期的参照作物需水量ETr,计算出作物各生育期的作物系数KC和以中式蒸发皿为基础的作物需水系数。所得参数可为类似地区的西瓜和蜜瓜滴灌系统灌溉制度的设计提供参考。

This paper studies the effect of weather change on regional evaporation by analyses change trend of reference crop evapotranspiration(ET0), and the effect of irrigational agriculture development on irrigation district actually measured evaporation from water surface. The mean monthly ET0 values for the period 1961~2001 of five weather stations in Guanzhong Region is estimated by modified Penman equation. The annual ET0 values shows a light increasing trend and this trend is enlarge after 1980's. But...

This paper studies the effect of weather change on regional evaporation by analyses change trend of reference crop evapotranspiration(ET0), and the effect of irrigational agriculture development on irrigation district actually measured evaporation from water surface. The mean monthly ET0 values for the period 1961~2001 of five weather stations in Guanzhong Region is estimated by modified Penman equation. The annual ET0 values shows a light increasing trend and this trend is enlarge after 1980's. But annual distribution of ET0 values shows that the ET0 proportion of the three months (from June to August) has a decreasing trend. Annual observed evaporation from water surface for the period 1955~1994 of Jinghuiqu irrigation district experiment station shows a decrease trend and annual distribution of it shows that the proportion of the three months (from June to August) has a decreasing trend too. It implies that irrigational agriculture development causes the regional farmland weather change, and decrease ET0 values and actually evaporation in summer season.

主要从分析参考作物蒸发蒸腾量(ET0)的变化趋势来反映气候变化对蒸发的影响,从灌区实测水面蒸发量的变化趋势来分析灌溉农业发展对区域蒸发的影响。用改进后的Penman公式计算关中地区1961~2001年系列5个气象站的ET0,结果显示:80年代前后气候对关中地区年ET0值的影响有明显区别,80年代以后关中地区年ET0值增长趋势加大,受气候影响明显大于80年代以前。多年平均年内分布表明连续最大3月即6~8月占全年的比例为46%~48%,但80年代以后年内分布6~8月ET0所占比例有降低趋势;从泾惠渠灌区灌溉试验站实测水面蒸发资料分析,显示明显的逐年减少的趋势,年内分布表明6~8月水面蒸发量所占比例有降低趋势。说明灌溉农业发展引起农田小气候的变化,减少了夏季潜在的蒸发和实际蒸发量。

 
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