Effects of straw mulching and irrigation on solar energy utilization efficiency of winter wheat farmland
研究了秸秆覆盖和灌溉对冬小麦农田光能利用率的影响.结果表明,秸秆覆盖降低了冬小麦的基本苗、分蘖数及生育前期的叶面积指数，但到生育后期，覆盖处理的叶面积指数反而升高.覆盖和灌溉降低了光合有效辐射（PAR）的底层透射率和冠层反射率，使PAR总截获率升高.覆盖和灌溉主要增加了40～60 cm高度的PAR截获率.覆盖处理籽粒光能利用率降低，茎叶光能利用率和总光能利用率升高.
The study showed that straw mulching decreased the basic seedlings and tillers of winter wheat and the leaf area index (LAI) at earlier growth stage,but increased the LAI at latter growth stage.Straw mulching and irrigation reduced the transmittance and reflectance of PAR,resulting in the increase of PAR capture ratio mainly at the height of 40～60 cm.The solar energy utilization ratio of grain was decreased by straw mulching,while that of stem and leaf was increased.The total solar energy utilization efficiency of winter wheat could also be increased by straw mulching.
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