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水面蒸发
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  water surface evaporation
Using the water-balance method, the authors studied the water consumption of tomato (Lycopersicon esculentum Mill.) and the relationship between evapotranspiration and water surface evaporation measured with 20?cm pan.
      
The accumulative value of evapotranspiration is approximately equal to the accumulative value of water surface evaporation measured using 20?cm pan.
      
Evaporation may be approximated using the mean monthly pan evaporation or free water surface evaporation data.
      
It was also established that there was a corresponding increase in open water surface evaporation during this period.
      


In this paper,the data on water surface evaporation are analysed. The change of relative evaporation in windbreak network can be fitted by segmental curve, which includes two parts:the logarithmic one obeies natural logarithmic rule Eh/E0=a1 +b1lnh,and the second-degree curve one obeies second-degree curve rule,Eh/E0=a2h2 +b2h+c.Based on the characteristic study of horizontal distribution of evaporation,the mean relative evaporation intensity in windbreak network is estimated and the optimum distance space of...

In this paper,the data on water surface evaporation are analysed. The change of relative evaporation in windbreak network can be fitted by segmental curve, which includes two parts:the logarithmic one obeies natural logarithmic rule Eh/E0=a1 +b1lnh,and the second-degree curve one obeies second-degree curve rule,Eh/E0=a2h2 +b2h+c.Based on the characteristic study of horizontal distribution of evaporation,the mean relative evaporation intensity in windbreak network is estimated and the optimum distance space of sheltbelts for water reserve is discussed.

通过水面蒸发观测资料分析,提出林网内相对蒸发变化可用分段曲线拟合,分为对数区与二次曲线区两部分.对数区相对蒸发变化服从对数规律EA/E0=a1+b1lnh,二次曲线区相对蒸发变化服从二次曲线规律Eh/E0=a2h2十b2h+c.在蒸发水平分布特征研究基础上,对林网内平均相对蒸发强度进行了估算,并讨论了保水性能最佳防护林带距间题.

Making observations within forest with 30%of coverage percentag and in wilder-ness at the same time, the one months results in May showed as follows。Radiation intensity:At 2m high within cakcayr forest,the value is 91.1%of wilderness;Near the soil surface within forest is 5 7.4%of wilderness。Temperature at the soil surface : Daily range within forest in layer of 0~25cm depth islower than that of wildemess;During the cooling days,the ground temperatures in every lay-er are higher than that of wilderness in a...

Making observations within forest with 30%of coverage percentag and in wilder-ness at the same time, the one months results in May showed as follows。Radiation intensity:At 2m high within cakcayr forest,the value is 91.1%of wilderness;Near the soil surface within forest is 5 7.4%of wilderness。Temperature at the soil surface : Daily range within forest in layer of 0~25cm depth islower than that of wildemess;During the cooling days,the ground temperatures in every lay-er are higher than that of wilderness in a whole day。Air temperature:Mean air temperature of upper layer(2~3m high)and lower layer(0. 1m high)within forest is higher than that of wilderness;Air tempereture near the soil sur- face within forest is.higher than that of wilderness in the morning and in the evening,butlower at noon or so。Relative humidity:RH within forest is 3%more than that of wilderness at daytime,it islower at night。Evaporation of water surface:Within forest evaporation is 3 9%lower than that ofwilderness。Wind speed:At l.5m high within forest.It is 53.7%lower than that of wilderness;At0.1m high within forest,it is 68.9%lower than that of wilderness。

在复盖度30%的梭梭林内与旷野分别设观测点,5月份1个月同时观测结果指出:①辐射强度:2m高处林内为旷野的91.1%,近地表处林内为旷野的57.4%。②地温:日较差林内低于旷野,降温天林内高于旷野。③气温:上下层平均气温林内高于旷野,地表层早晚高于旷野,中午低于旷野。④相对湿度:白天林内比旷野高3%,夜晚低于旷野。⑤水面蒸发量:林内比旷野低39%。⑥风速:1.5m高处林内比旷野低53.7%,0.1m高处林内比旷野低68.9%。

The investigation and location observation on the economic and shelter-protective benefits from the different- typed farmland -protective forests shows that in the Maowusu sandy area shelter-forests are capable of reducing wind speed and evaporation,regulating local air and soil temperatures. Meanwhile,the shelter -forest can being higher agricultural preduction,as well as plenty of timbers.

通过对毛乌素沙地不同类型地农田防护林防护效益及经济效益的调查和定位观测,结果表明:毛乌素沙地农田防护林具有降低风速、调节改善气温、土温,提高空气湿度,减少水面蒸发的功能,农田防护林带作用下,农作物增产,并能够提供一定数量的木材。

 
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