叶面积和降雨强度对大豆茎秆流的影响

Effect of leaf area and rainfall intensity on the stemflow of Glycine max

采用室内人工模拟降雨的方法,测定不同降雨强度下大豆(Glycine max)各个生长阶段所产生的茎秆流量,并分析大豆茎秆流量与叶面积和降雨强度的关系。结果表明:大豆在其全生育期内,茎秆流量占冠层上部降雨的16.77%,在大豆生长最为旺盛阶段可达到32.15%;茎秆流量随叶面积、降雨强度增大呈增加趋势,而其在降雨中的比例则随叶面积增大而增加,随降雨强度增大而减小;拟合出大豆茎秆流量与叶面积指数和降雨强度的定量关系。研究结果可为大豆作物冠层水分再分布的研究提供参考。

The objective of this study was to measure the stemflow amount by Glycine max and determine the effect of leaf area and rainfall intensity on stemflow of Glycine max at different growing stages. The experiment was conducted in the laboratory using a rainfall simulator. The results showed that the mean ratio between stemflow and total rainfall is 16.77% ,and the highest ratio reached 32.15%. The amount of stenrflow from Glycine max increased as Glycine max leaf area and rainfall intensity increased. The ratio between stemflow and total rainfall increased as leaf area increased and decreased as rainfall intensity increased. Two simple equations were built to describe those two relationships. This results provides theoretical direction for study the water redistribution in Glycine max canopy.