1)Field evapotranspiration农田蒸散
1.A comparative study on calculation methods of field evapotranspiration;农田蒸散量计算方法的比较研究
2.Utilization of remote sensing for regional field evapotranspiration estimation遥感技术在区域农田蒸散研究中的应用
3.This paper summarized the main theories and methods in measuring field evapotranspiration, i.对目前国内外测量农田蒸散的主要理论和方法,包括水量平衡法、蒸渗仪法、零通量面法、涡度相关法和能量平衡法进行了总结,探讨了其使用中存在的问题,预测了农田蒸散在这方面研究的发展趋势。
英文短句/例句
1.A Comparative Study on Estimation Models for Field Evapotranspiration几种蒸散模型在玉米农田蒸散量计算中的应用比较
2.The Process and Characteristic of Evapotranspiration in Spring Maize Fields on the Loess Plateau黄土塬区春玉米农田蒸散过程及其特征研究
3.Utilization of remote sensing for regional field evapotranspiration estimation遥感技术在区域农田蒸散研究中的应用
4.Changes in Evapotranspiration in the Main Agriculture Areas of Central Tibet and Its Relation to the Environment Factors in 1971-20051971—2005年西藏主要农区农田蒸散量变化特征及其与环境因子的关系
5.Study of Field Evapotranspiration Model and the Characteristics of Underlying Surface Parameter of the North China Plain (NCP);华北平原农田蒸散模型及其下垫面特征参数研究
6.Evapotranspiration Characteristics of Capsicum under Alternative Furrow Irrigation控制性交替隔沟灌溉对甜椒农田蒸散特征的影响
7.Study of Canopy Photosynthesis and Evapotranspiration Coupled Model in the Agroecosystem;农田生态系统冠层光合与蒸散耦合模型研究
8.Estimation models of aspen shelter belt evapotrans piration in Tarim River Basin;塔里木河流域白杨农田防护林蒸散量估算模型
9.Effects of Different Approaches of Corn Straw Mulchingon Soil Evaporation Evapotranspiration and on Soil Temperature of Winter Wheat Field;玉米秸秆覆盖对冬小麦田间蒸发、蒸散和地温的影响
10.Experimental Study on Farmland Evapotranspiration of Summer Maize under Alternative Furrow Irrigation夏玉米控制性交替隔沟灌溉农田蒸发蒸腾的试验研究
11.Effects of Mixed Trees of Farmland Shelterbelts on Transpiration Rate农田防护林混交对林木蒸腾速率的影响
12.Characterization of Evapotranspiration Rules and Their Influencing Factors in Wheat-corn Intercropping Field in Oasis Area绿洲灌区小麦//玉米田间水分的蒸散特性及主要影响因素
13.Further discussion on the calculation method of field drain spacing对蒸发影响下农田排水沟(管)间距计算方法的探讨
14.Study on Phreatic Water Evaporation Affected by Crop Growth in Dry Inland Regions and Farm Drainage Calculation;干旱内陆区作物生长影响的潜水蒸发和农田排水计算研究
15.Relationships between Evaporation of Arable Mollisol and Soil Moisture and Meteorological Factors in Northeast China东北农田黑土蒸发量与土壤水分及气象因子的关系
16.Agricultural climate division of Hebei Province based on potential evapotranspiration and surface aridity index基于潜在蒸散和干燥度指数的河北省农业气候区划
17.and even more quaint villages scattered among its low-lying hills and forever green fields.却有更多古意盎然的农村散布在低洼的山丘和常绿的田野间。
18.A short poem or prose piece depicting a rural or pastoral scene, usually in idealized terms.田园诗描写农村或畜牧风光的短诗或散文,一般使用理想化的语言
相关短句/例句
evaportranspiration农田蒸散量
1.The estimation of evaportranspiration with Penman-Monteith and evaporator methods;利用Penman-Monteith法和蒸发皿法计算农田蒸散量的研究
3)cropland evapotranspiration农田蒸散发量
1.With the first-hand data about the changing rules in cropland evapotranspiration collected by the Ranzhuang Water Resources Experiment Station from the wheat and corn field, an analysis is made on the changing rules cropland evapotranspiration course and depth, and the concerned data range in the condition of experiment is brought forward.根据冉庄水资源实验站大型地中蒸渗仪在种植小麦、玉米情况下的农田蒸散发量实测资料,分析了农田蒸散发量的时程及深度变化规律,提出了在实验条件下农田蒸散发量的数值范围。
4)Actual evapotranspiration in farmland农田实际蒸散
5)Actual evapotranspiration on crop fields农田实际蒸散量
6)STUDY OF FIELD EVAPOTRANSPIRATION农田蒸散的研究
延伸阅读
农田蒸散量 又称腾发量、农田总蒸发量。作物蒸腾量与棵间土壤蒸发量的总和。在径流和渗漏量很小的情况下,农田蒸散量可大致代表农田实际的耗水量。 农田蒸散量可用仪器测定,也可间接计算。主要计算方法有:①能量平衡法。以鲍文比较具代表性。它以热量平衡公式Rn=QS+SH+LE为依据。式中Rn为辐射平衡,QS为土壤热通量,SH为空气显热能量,LE为蒸发潜热。鲍文比β=SH/LE≈0.5△T/△e,△T和△e分别表示近地层两个高度的温度差和水汽压差,因而β 值可通过实验确定。如辐射平衡(Rn)与土壤热通量(QS)以及β 值为已知,也可算出蒸发潜热与农田蒸散量。②湍流交换法。将风的瞬时分量(上升气流与下沉气流)与水汽密度的瞬时值联系起来测定水汽的输送,此法对仪器要求较高,工作量大。③水量平衡法。即通过土壤湿度的观测,分析农田土壤水分收支状况,从而推断蒸散量。④综合法。以彭曼公式为代表,带有经验性质,并有较充分的物理学理论依据,一般适用于湿润的平原地区。彭曼简式为Ew=△H+Eα/(△+r)。式中Ew表示自由水面的蒸发量(毫米/日);Eα=0.35(eα-ed)(1+u2·10-2)(毫米/日),其中eα与ed分别为平均温度时的饱和水汽压与实际水汽压(毫米);u2为2米高处的平均风速;△为饱和水汽压-温度曲线在平均气温Tα时的斜率; H是根据经验公式估算的辐射收支的水分蒸发当量(毫米/日); r为干湿表常数。农田蒸散量E=αEw,α为计算参数。 农田蒸散量为农田水分平衡的主要支出项,是计划蓄水、供水,设计防旱、抗旱措施等的重要依据,鉴定作物水分供应条件的重要指标。影响农田蒸散量的主要因子有:由大气干燥程度、辐射平衡和风力大小所决定的蒸发势,土壤供水状况,以及植被状况对湍流交换系数的影响等。农田蒸散量以及其中植物蒸腾与棵间蒸发两部分数量的比例,随种植制度、栽培措施和作物生长状况而变化。调节农田蒸散量与蒸腾、蒸发的比例关系,可提高水分利用率,即消耗单位水分可获得较多的经济效益。调节蒸散量的农业措施有灌溉、排水、耕作、改变种植制度和方式,设置风障和防护林,覆盖和喷洒保墒增温剂等。