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crop coverage
相关语句
  作物覆盖度
     The results showed that,there were two process: overflow and subface flow. Runoff dynamic course were influenced by different rainfall intensity and crop coverage.
     研究结果表明:紫色土坡地产生地表径流和壤中流两种径流模式,壤中流其径流动态过程受降雨强度和表层作物覆盖度的影响;
短句来源
  “crop coverage”译为未确定词的双语例句
     The method of crop coverage calibration for the canopy temperature and the temperature-difference indexes of the drought grades were also presented in this paper.
     本文还提出了冠层温度的覆盖度校正方法和进行旱涝等级划分的温差指标。
短句来源
     Soil and water loss on cultivated slope lands in soil and rock mountain areas in southern Liaoning province was studied through experiment of artificial simulation of rainfall. The experiment is designed as linear rectangular regression of four factors and two levels. The experimental factors selected as rainfall erosion capability ( R ), land slope ( S ), soil moisture before rainfall ( W) and crop coverage (C) .
     应用人工模拟降雨方法对辽南土石质山区坡耕地水土流失进行试验研究 ,试验按四因子二水平一次回归正交设计 ,试验因子选择降雨侵蚀力 (R)、地面坡度 (S)、雨前土壤含水量 (W)和作物盖度 (C)。
短句来源
     By taking into account the five factors in the experiment, such as water mineralization degree, times of irrigation, irrigation rate, organic manure application rate and crop coverage, differences in courses and mechanisms of the variation of water and salt in the soil between different stages were explored.
     综合考虑了灌溉水矿化度、灌水次数、灌水量,有机肥施用量及覆盖5种不同试验因素下,土壤水分和盐分在不同阶段的变化过程及机理的差异。
短句来源
  相似匹配句对
     Crop Design
     作物设计
短句来源
     Integrated coverage
     综合信息
短句来源
     Optimal Crop Insurance Coverage Level Under Area Yield Plan
     AYP条件下作物最优投保额水平研究
短句来源
     Experimental Study on Preventing Soil Wind Erosion by Conservative Crop Stubble Coverage
     保护性耕作残茬覆盖防治农田土壤风蚀的试验研究
短句来源
     THE MIXED COVERAGE SWITCH
     混合式覆盖开关
短句来源
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  crop coverage
DBCP concentration in groundwater was related to the crop coverage.
      
The enormous gaps in geographic, time period, and crop coverage are unlikely ever to be filled.
      
The crop coverage varies in each report with a focus on those crops that are currently in an active seasonal growth pattern.
      
If dilution with water is needed for full crop coverage, fill tank with approximately 3/4 of the water required for dilution.
      
Given the importance of adequate soil moisture, crop coverage is assumed to decrease with diminishing mean annual rainfall conditions.
      


The canopy-air temperature-difference models, RW = a + b (Tc-Ta), for wheat, corn and cotton, and the soil-air temperature difference model, RW = a' + b'(Ts -Ta), for bare soil were developed based on the data observed in Handan area in 1990 and 1991. The average relative error was less than 20%. The models are simple and easy to be used for irrigation management and drought monitoring over large areas. The method of crop coverage calibration for the canopy temperature and the temperature-difference indexes...

The canopy-air temperature-difference models, RW = a + b (Tc-Ta), for wheat, corn and cotton, and the soil-air temperature difference model, RW = a' + b'(Ts -Ta), for bare soil were developed based on the data observed in Handan area in 1990 and 1991. The average relative error was less than 20%. The models are simple and easy to be used for irrigation management and drought monitoring over large areas. The method of crop coverage calibration for the canopy temperature and the temperature-difference indexes of the drought grades were also presented in this paper.

本文根据邯郸地区的观测资料,建立了小麦、玉米和棉花地的土壤相对含水量和14时冠气温差(Tc-Ta)的作物旱情温差模型RW=a+b(Tc-Ta)_(14)和裸地土壤相对含水量和14时土气温差(Ts—Ta)的土壤旱情温差模型RW=a′+b′(Ts-Ta)_(14)。经检验,平均相对误差小于20%,适于灌溉管理和大面积监测旱情之用,具有快速、简便的特点。本文还提出了冠层温度的覆盖度校正方法和进行旱涝等级划分的温差指标。

The quantitative study of farmland water transfer using mathematical model is an important research aspect of agriculture water saving mechanism. But it is difficult to separately calculate the process of soil surface evaporation and crop transpiration in mathematical modeling of farmland water cycling. Based on the field experimental work, the calculation model of soil surface evaporation and crop transpiration has been summarized, using obtained Penman's potential evapotranspiration. The evaporation and crop...

The quantitative study of farmland water transfer using mathematical model is an important research aspect of agriculture water saving mechanism. But it is difficult to separately calculate the process of soil surface evaporation and crop transpiration in mathematical modeling of farmland water cycling. Based on the field experimental work, the calculation model of soil surface evaporation and crop transpiration has been summarized, using obtained Penman's potential evapotranspiration. The evaporation and crop transpiration can be separated according to crop coefficient and crop coverage ratio in field. From the experimental relation between field soil surface evaporation and soil moisture on the surface, the actual soil surface evaporation could be determined. The model has been applied to mathematical simulation of farmland water cycling and the results seemed good, compared with field observed data. The presented calculation model for evaporation and transpiration has practical value in agricultural water saving study.

用数学模型定量化研究农田水分转化规律是农业节水机理研究的重要方面,但农田水分循环数学模型中的棵间土面蒸发和作物蒸腾过程难于计算。文中通过田间试验总结的土面蒸发和作物蒸腾计算模式,首先用Penman公式计算出潜在腾发量,根据作物系数和作物覆盖度划分出作物颗间蒸发和作物蒸腾,再用试验资料总结的棵间蒸发与表土含水率经验关系计算实际棵间土面蒸发。该模式应用于数学模拟计算,其结果与田间实测资料对比,符合实际。文中蒸发蒸腾计算模式在农业节水机理研究中有实用价值。

Based on analysis of current natural conditions,social economy and humanism of Maowusu sandy land,the limited factors and benefits which affect high efficient ecological economy system were diagnosed.The theory and methods of linear planning were applied to design system optimally with the precipitation of 280mm (at 80% probability),350mm(middle intensity),400mm(higher intensity),there were the coverage of crops of 65%,825%,95% in runoff gardens and 75%,92%,100% in high efficient agricultural area...

Based on analysis of current natural conditions,social economy and humanism of Maowusu sandy land,the limited factors and benefits which affect high efficient ecological economy system were diagnosed.The theory and methods of linear planning were applied to design system optimally with the precipitation of 280mm (at 80% probability),350mm(middle intensity),400mm(higher intensity),there were the coverage of crops of 65%,825%,95% in runoff gardens and 75%,92%,100% in high efficient agricultural area respectively.However,the probability of at least 400mm precipitation in Maowusu sandy land is very low,and the probability of at least 350mm precipitation is also lower.Therefore,in order to ensure sustainable development for high efficient ecological economy system,the precipitation was considered to be 280mm,with which the crops coverage could reach 65% in runoff gardens,75% in high efficient agricultural area.The maximum coverage was less than 80%.It also shows the limited factors of sustainable development for high efficient ecological economy system is water condition in Maowusu sandy land.

在分析毛乌素沙地自然、社会经济、人文等条件与现状的基础上,诊断高效生态经济复合系统运行的限制因素及有利条件。运用线性规划的理论与方法进行系统的优化设计。当降水量分别在80%保证率的280mm、中等雨量350mm、较强雨量400mm时,径流园林区中种植作物覆盖度分别为65%、82.5%、95%;高效农牧区的种植覆盖度分别为75%、92%、100%。但在毛乌素沙地降水达到400mm的保证率很低,350mm的降水保证率也较低,为保证高效生态经济复合系统的持续发展,降水量以280mm计算为宜,也即径流园林区的种植覆盖度可达到65%;高效农牧区的种植覆盖度可达到75%,最大不超过80%。同时表明在毛乌素沙地高效生态经济复合系统持续发展的限制因子主要是水分。

 
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