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农沟
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     for the dryland crop fields, the annual drainage through field ditch was only 1.0 cm, accounting for 4% ofthe total subsurface drainage.
     旱田的农沟排水量较少,只有1.0cm,占地下排水总量的4%。
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     Results show that the simulated drainage volume from the field ditch is extremely close to the observed value,and the relative error of annual drainage volume is only 0.4%;
     结果表明:模拟的农沟排水量与试验观测值极为接近,年平均排水量误差仅为0.4%;
短句来源
     This paper designs an experiment of catching and controlling the precipitation by means of covered ridge planted flute in semi-arid field as one way of controlling soil-plant-atmospheric continued system, for receiving and storing precipitation fully and decreasing evaportranspiration and flow-out of water-soil-fertilizer causing by flow and proposed hydrologic balance equation of semi-arid field flut.
     为了在降水不足的旱作农业区,充分接收、贮存大气降水,减少无效蒸发和因径流引起的水、土、肥的流失,笔者设计了作为农田土壤、作物、大气连续系统的调节措施之一,旱农沟种垅覆集水试验;
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     The calculation results showed that,for the paddy fields, the annual drainage through field ditch was as high as 56cm, accounting for 58% of total subsurface drainage;
     结果表明,在现有灌排制度下,生长期内水田的农沟排水量约56cm,占地下排水总量的58%;
短句来源
     Flow measurement data showed that when the depths of drainage ditches were reduced from 1m to 60cm by the weirs,the subsurface drainage water amount was reduced by 50%,but the salt content in the controlled fields increased merely by 3.7%.
     试验结果表明,将深度为1m的排水农沟控制到60cm时,生长期内农沟地下排水量减少了50%左右。 排水量减少后,田间地下水含盐量增长幅度仅为3.7%,远远低于影响作物生长的临界含盐量。
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     for the dryland crop fields, the annual drainage through field ditch was only 1.0 cm, accounting for 4% ofthe total subsurface drainage.
     旱田的排水量较少,只有1.0cm,占地下排水总量的4%。
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  farm ditch
Since 1990, sprinkler irrigation systems have been installed on 21,550 acres and 270 miles of on-farm ditch and lateral lining has been undertaken.
      


This paper designs an experiment of catching and controlling the precipitation by means of covered ridge planted flute in semi-arid field as one way of controlling soil-plant-atmospheric continued system, for receiving and storing precipitation fully and decreasing evaportranspiration and flow-out of water-soil-fertilizer causing by flow and proposed hydrologic balance equation of semi-arid field flut. This experiment indicats that the water input is increased, the water output is decreased, the soil moisture...

This paper designs an experiment of catching and controlling the precipitation by means of covered ridge planted flute in semi-arid field as one way of controlling soil-plant-atmospheric continued system, for receiving and storing precipitation fully and decreasing evaportranspiration and flow-out of water-soil-fertilizer causing by flow and proposed hydrologic balance equation of semi-arid field flut. This experiment indicats that the water input is increased, the water output is decreased, the soil moisture is increased and conserved well in the plant flute by using this means. It's not only advantage of anti-drought and rich crop and build up the stable hydro-control semi-arid agriculture, but also advantage of decreasing the flow-out of water-soil-fertilizer. It has obvious economic effect and ecologic effect.

为了在降水不足的旱作农业区,充分接收、贮存大气降水,减少无效蒸发和因径流引起的水、土、肥的流失,笔者设计了作为农田土壤、作物、大气连续系统的调节措施之一,旱农沟种垅覆集水试验;提出了旱作农田沟作地段的水分平衡方程。通过试验说明,该措施使作物沟地的水分收入增加,支出减少,土壤增墒、保墒能力增强。它既有利于抗旱增产,建立稳定的节水型旱作农业,又减少了径流引起的水、土、肥的流失,有明显的经济效益与生态效益。

The Yinnan Irrigation District is located in the upper reachesof the Yellow River in China. Due to historical reasons, the district diverts alarge amount of irrigation water from the Yellow River and consequently discharges a relatively large amount of drainage water to the downstream river. In order to mitigate the negative impact of the current water management practice on water quality of the Yellow River, a comprehensive analysis was conducted on the drainage system of the irrigation district. The calculation...

The Yinnan Irrigation District is located in the upper reachesof the Yellow River in China. Due to historical reasons, the district diverts alarge amount of irrigation water from the Yellow River and consequently discharges a relatively large amount of drainage water to the downstream river. In order to mitigate the negative impact of the current water management practice on water quality of the Yellow River, a comprehensive analysis was conducted on the drainage system of the irrigation district. The calculation results showed that,for the paddy fields, the annual drainage through field ditch was as high as 56cm, accounting for 58% of total subsurface drainage; for the dryland crop fields, the annual drainage through field ditch was only 1.0 cm, accounting for 4% ofthe total subsurface drainage. Therefore, it is feasible to implement controlled drainage practice in the rice growing areas in order to reduce drainage discharge and save irrigation water.

作为灌溉农业的一项保障措施,农田排水在维持田间水盐平衡的同时,也向下游输送了大量可能成为地表水污染源的物质。位于黄河上游的宁夏银南灌区由于历史原因形成的"大引大排"积习,每年将过量的农田排水排入黄河,成为下游水质污染源,同时也浪费了宝贵的水资源。该文针对宁夏银南灌区过量排水问题,对灌区排水现状进行了详细的分析和计算。结果表明,在现有灌排制度下,生长期内水田的农沟排水量约56cm,占地下排水总量的58%;旱田的农沟排水量较少,只有1.0cm,占地下排水总量的4%。建议在水田农沟上加筑控制性建筑物,如堰等,对排水量进行控制,达到节约灌溉用水和减少农田排水对下游河道污染的目的。

The Yinnan Irrigation District,in Ningxia Hui Autonomous Region discharges a large amount of drainage water into the Yellow River each year and influences the water quality of the River.A field experimental study on the effect of drainage control on salt and water balance in rice fields was carried out in summer,2004.Controlling weirs were installed at the field ditch outlets to raise water level during the growing season.Flow measurement data showed that when the depths of drainage ditches were reduced from...

The Yinnan Irrigation District,in Ningxia Hui Autonomous Region discharges a large amount of drainage water into the Yellow River each year and influences the water quality of the River.A field experimental study on the effect of drainage control on salt and water balance in rice fields was carried out in summer,2004.Controlling weirs were installed at the field ditch outlets to raise water level during the growing season.Flow measurement data showed that when the depths of drainage ditches were reduced from 1m to 60cm by the weirs,the subsurface drainage water amount was reduced by 50%,but the salt content in the controlled fields increased merely by 3.7%.It may conclude that the drainage control plays a significant role in water saving and non-point source pollution reduction.

宁夏银南灌区每年从黄河引水约16亿m3,其中超过一半的水量以排水形式退回黄河或湖泊湿地。监测数据显示目前排水的含盐量较低,排水过量现象严重,不仅导致了水资源的浪费,而且加剧了黄河及湖泊湿地的污染。造成这种现象的主要原因之一是现有灌区排水系统能力过剩。本文介绍了在该灌区水稻田进行的一项控制排水试验,研究了在生长期内抬高排水沟出口对田间排水和盐分变化的影响。试验结果表明,将深度为1m的排水农沟控制到60cm时,生长期内农沟地下排水量减少了50%左右。排水量减少后,田间地下水含盐量增长幅度仅为3.7%,远远低于影响作物生长的临界含盐量。因此,控制排水措施具有节约灌溉用水和减少农业非点源污染的重要意义。

 
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