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通过田间试验采用基于热平衡法的茎流计测定玉米/大豆条带间作群体内作物的蒸腾规律.结果表明:间作群体内,玉米和大豆植株的茎流速率在晴天呈单峰曲线,在阴天则呈多峰曲线.植株的茎流受多个环境因子的影响,其中太阳辐射是影响植株茎流最主要的气象因子.玉米和大豆的单株日茎流量与多个气象因子间存在较好的相关关系,达到极显著水平.茎流观测期内(2008年6月1—30日),间作群体内玉米植株的日均蒸腾量(1.44mm.d-1)为大豆(0.79mm.d-1)的1.8倍,玉米和大豆植株的蒸腾量分别占间作群体总蒸腾量的64%和36%.考虑到作物的茎直径和叶面积的空间变异,安装一定数量的茎流探头对于准确测定植株茎流是十分必要的.
The field experiments were conducted to determine the transpiration of crops in the intercropping system between maize and soybean bands by using the thermo-balance stem flow meter.The results showed that the stem flow rate of maize and soybean in the intercropping group showed a single peak curve on the sunny day, Then the multi-peak curve.The plant stem flow is affected by a number of environmental factors, of which solar radiation is the most important meteorological factor affecting the plant stem flow.Correlated daily corn flow and multiple meteorological factors exist better (June 1 to 30, 2008), the daily average transpiration rate (1.44mm d-1) of maize plants in the intercropping group was soybean (0.79mm.d -1), and the transpiration rate of corn and soybean plant accounted for 64% and 36% of the total transpiration volume of intercropping group, respectively.According to the spatial variation of stem diameter and leaf area of crops, installing a certain number of stem flow probes for accurate It is necessary to determine the plant stem flow.