大兴安岭几种典型林分林冠层降水分配研究

Precipitation Distribution Laws of Different Forest Stand in Daxing'anling

对大兴安岭7种典型林分林冠层降水分配进行了研究,结果表明,2007年5-9月,大气总降水量为236.62 mm,平均每次降雨量11.27 mm;随着降雨量的增加,穿透雨量、茎流量和林冠截留量都增加,林冠截留率降低;7种林分穿透雨量分别为151.48 mm,156.16 mm,141.40 mm,162.11 mm,182.35 mm,148.69 mm,156.29mm,分别占林外降雨总量的64.02%,66.0%,59.76%,68.51%,77.06%,62.84%,66.05%;7种林分单株树干茎流量分别为4.99 mm,2.45 mm,0.82 mm,1.28 mm,3.30 mm,2.94 mm,1.67 mm,分别占降雨总量的2.11%,1.04%,0.35%,0.54%,1.39%,1.24%,0.71%;以线性回归方程来拟合穿透雨(y)和林外降雨(x)之间的关系最好;树干茎流与林外降雨的关系用线性回归方程拟合较好,但是树干径流与林外降雨之间关系不如穿透雨与林外降雨之间关系紧密;林冠截留量与降雨量之间存在紧密的正相关关系.

Study on the precipitation distribution laws of 7 forest stand in trial district of forest technical extend station in Daxing＇anling. The results indicated that： between the months 5-9 of the year 2007, total rainfall was 236. 62 mm, rainfall of average per time was 11.27 mm; The distribution of precipitation by can- opy was more relative to the rainfall, the higher the rainfall was, the more the throughfall, stemflow and crown interception were, but the lower the crown interception rate were; throughfall for 7 forest stand were151.48 mm,156.16 mm,141.4 mm, 162.11 mm,182.35 mm,148.69 mm,156.29 mm,accounted for 64. 02% ,66.0% ,59.76% ,68.51% ,77.06% ,62.84% ,66.05% of total rainfall; stemflow for 7 forest stand were 4.99 ram,2.45 mm,0. 82 mm,1.28 mm,3.30 mm,2.94 mm,1.67 mm,accounted for 2. 11%,1.04%,0. 35 % ,0.54 %, 1.39 %, 1.24% ,0.71% of total rainfall. The relationships between throughfall and total rainfall could be described significantly by a linear function; The relationships between stemflow and total rainfall could be described significantly by a linear function, but they are not closed than the relationships between throughfall and total rainfall; While the relationship between crown interception and total rainfall by a closed positive function.