Seepage compensation method for measuring evapotranspiration over reed swamp
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摘要: 提出了一种蒸散发实测方法——三筒补偿蒸渗仪法,可以在不干扰芦苇生长状态的原形条件下,直接测算出芦苇沼泽蒸散耗水量和水面蒸发量。扎龙湿地2004、2005两年的实测结果表明,5月中旬至10月中旬间的芦苇带平均蒸散量(AET)为812.1 mm,水面蒸发量(Ew)为433.9 mm;芦苇沼泽蒸散耗水量最大值发生在6、7月份,而水面蒸发量最大值出现在5月份;各月的AET/Ew比率变化明显,平均值为1.87。还根据实测数据建立了扎龙芦苇沼泽蒸散发的多元回归模型,可为湿地水资源规划和管理服务。Abstract: A direct method for actual evapotranspiration (AET) measurement is presented,that is,the compensatory lysimeter method with three cylinders.By using this method,the evapotranspiration loss over water surface and aquatic macrophytes can be measured directly without destroying reed's living conditions.Experimental test was carried out in Zhalong wetland from 2004 to 2005 (during reed growing time in the middle of May-Oct.).The primary analysis results are as follows: (1) the average AET over reed belt of the two years is 812.1 mm and the average evaporation over water surface (Ew) is 433.9 mm; (2) the AET of reed belt reaches its maximum in June or July every year,while the maximum of Ew appears in May;and (3) the ratio of AET to Ew varies markedly in different months,and the average ratio in reed growing season is 1.87.By the observed data,a multi-regression equation of AET for Zhalong reed belt is established.It can serve as a useful tool for water resource planning and management of wetland.
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Key words:
- seepage compensation /
- reed belt /
- evapotranspiration /
- multi-regression /
- Zhalong wetland
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