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2012年7-9月中旬,以科尔沁沙地小叶锦鸡儿灌从为对象,研究了其不同部位的穿透雨特征。结果表明:试验期间的总降雨量为105.99mm,其中,12.5%的降雨事件<2mm,50%的降雨事件<5mm。穿透雨量占同期降雨量的76.80%。小于1 mm的降雨对于灌丛下土壤不能产生补给,全部降水都被灌丛截留进而蒸发,对灌丛下土壤属于无效降水。穿透率最大值、最小值分别为85.67%、56.87%。穿透雨量与降水量之间的关系可用线性公式较好的表达(P<0.01,R2=0.73)。穿透率随降雨量、降雨强度的增大而增加,两者呈显著的对数关系(P<0.01)。在灌丛不同部位,穿透雨量大小表现为“冠幅边缘>1/2冠幅>灌丛基部”的特征,穿透雨量随降雨量增加而增大的趋势显现出冠幅边缘处快于1/2冠幅和灌丛基部处,1/2冠幅处快于灌丛基部。
From July to the middle of September 2012, we studied the trapping rain characteristics of different parts of Caragana microphylla from Horqin sandy land. The results showed that the total rainfall during the experiment was 105.99mm, of which, 12.5% of rainfall events <2mm and 50% of rainfall events <5mm. Penetration of rainfall accounted for 76.80% of rainfall over the same period. Rain of less than 1 mm could not produce enough soil for the shrubs. All the precipitation was shielded by the shrubs and then evaporated, and the soil under the shrubs was ineffective. The maximum and minimum penetration rates were 85.67% and 56.87% respectively. The relationship between rainfall penetration and precipitation can be better expressed by linear formula (P <0.01, R2 = 0.73). Penetration rate increased with the increase of rainfall and rainfall intensity, showing a significant logarithmic relationship (P <0.01). In different parts of the shrubs, the amount of rainfall showed the characteristics of “crown edge> 1/2 crown> shrub base ”. The tendency of the penetration of rainfall increased with the increase of rainfall showed that the crown edge At 1/2 base of the crown and at the base of the scrub, 1/2 crown faster than at the base of the scrub.