摘要
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.
In an experimental field with maize/soybean strip intercropping,the transpiration of maize and soybean plants was measured with sap flow gauge based on heat balance method. In the intercropping system,the diurnal change of the sap flow rates of the plants fitted single-peak curve in sunny day and multi-peak curve in cloudy day. The plant sap flow rates were affected by many environmental factors,among which,solar radiation was the most important meteorological factor. The daily sap flow per maize or soybean plant showed significant correlations with solar radiation,air temperature,relative humidity,wind speed,and soil heat flux. During the observation period （June 1-30,2008）,the mean daily transpiration of maize plant （1.44 mm·d-1） was about 1.8 times of that of soybean plant （0.79 mm·d-1）. Maize transpiration and soybean transpiration contributed 64% and 36% to the total transpiration of the intercropping system,respectively. Due to the spatial variation of stem diameter and leaf area,it would be necessary to install more sap flow gauges to accurately measure the sap flow of maize and soybean plants.
出处
《应用生态学报》
CAS
CSCD
北大核心
2010年第5期1283-1288,共6页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(50679082)
国家高技术研究发展计划项目(2006AA100209
2006AA100203)
国家科技支撑计划项目(2007BAD88B02)
商丘农田生态系统国家野外观测研究站开放基金项目资助
关键词
玉米/大豆间作
蒸腾
茎流
热平衡法
maize/soybean intercropping
transpiration
sap flow
heat balance method.
