膜下滴灌模式下种植密度对棉田蒸散发规律影响研究

为探求绿洲棉区膜下滴灌条件下不同种植密度棉田蒸散发规律，运用大型称重式蒸渗仪对膜下滴灌棉田蒸散过程连续监测，结果表明：在不同种植密度条件下，棉花的日蒸散量曲线都表现为单峰曲线，不同生育时期一膜六行（30株/m2）种植的棉田蒸散量比一膜四行（20株/m2）大，花铃期棉田的蒸散发强度最大，一膜四行、一膜六行分别为4.76mm/d、5.94mm/d。同时，一膜六行种植的叶面积指数大于一膜四行种植,株高小于一膜四行种植。花铃期棉田的蒸散发量与日平均气温（p<0.01）和空气相对湿度(p<0.01)具有很好的相关性，与日平均风速和日平均水汽压的关系不大。

Effect of planting density on Evapotranspiration of cotton field with under drip irrigation under Mulch

In order to explore the evapotranspiration of cotton fields with different planting densities under the conditions of drip irrigation under mulch in oasis cotton area, a large-scale weighing lysimeter was used to continuously monitor the evapotranspiration process of cotton fields under drip irrigation under film. The results showed that under the condition of different planting density, the daily evapotranspiration curve of cotton showed a single peak curve. The evapotranspiration of cotton fields planted in one film and six rows (30 plants / m2) at different growth stages is larger than that in one film and four rows (20 plants / m2). A film with four rows and a film with six rows are 4.76mm / d and 5.94mm / d, respectively. At the same time, the leaf area index of one film planting with six rows is larger than that of one film planting with four rows, and the plant height is smaller than that of one film planting with four rows. The evapotranspiration of cotton fields during flowering and boll-forming were significantly correlated with environmental factors of relative air humidity (p<0.01), the daily average atmospheric temperature(p<0.01), and has little relationship with the daily average wind speed and the daily average water vapor pressure.