长宁竹海主要林分林冠降雨分配格局

对长宁竹海楠竹林、黄竹林、苦竹林、杉木林和栎林5种林分林冠降雨分配格局进行了对比。回归结果表明:穿透雨量和干流与林外降雨量呈线性关系,并都达到极显著水平(p-0.01)。在降雨量为1204.7 mm时,5种林分穿透雨的最小响应雨量分别为:斑苦竹(Pleioblastus amarus Kengf)林为3.0 mm,硬头黄竹(Bambusa rigida Keng et Kengf)林为1.0 mm、白栎(Quercus fabri Hance)林为0.9 mm、楠竹(Phyllostachy spubescen)林为0.8 mm、杉木(Cunninghamia lanceolata Hook)林为0.7 mm。干流量随树干胸径的增加而增大,两者关系可用Q=B0 B1D B2D2 B3D3进行描述。与其它的林种相比,竹林干流量远高于栎林和杉木林。苦竹林干流量达105.3 mm,干流率为8.74%,黄竹和楠竹干流量均为82.4 mm,干流率为6.84%,栎林分别为42.4 mm和3.49%,杉木林最小,仅为8.8 mm和0.73%。截留量和截留率从大至小的排序为:苦竹林为384.3 mm和31.9%,栎林355.5 mm和29.51%,黄竹280.7 mm和23.3%,楠竹274.1 mm和22.75%,杉木林254.8 mm和21.15%。

Analysis of the Distribution Patterns of Canopy Precipitation of Main Forest Stands in Changning County

A comparative analysis is made of the distribution patterns of canopy precipitation of five forest stands in Changning County.The regressing results have indicated that throughfall and stemflow are linearly correlated to rainfall outside the stands at the extremely significant level(p-0.01).Stemflow will increase with the increase of the diameter breast-high,and their relation model can be described as:Q=B0 B1.D B2.D2 B3.D3D(Q is amount of stem flow,and D is diameter breast-high).The least rainfall produced by throughfall in the five forest stands is respectively from big rainfall to small showed as follows:3.0 mm in P.maculatu forest,1.0 mm in B.rigida forest,0.9 mm in Quercus fabri,0.8 mm in P.spubescen forest,and 0.7 mm in C.lanceolata forest.After comparing,the stemflow of bamboo is larger than that of other forest stands.The stemflow ratio is respectively 8.74% when the stemflow of P.macus forest comes to 105.3 mm,the stemflow ratio is 6.84 when the stemflow of P.spubescen and B.rigida forest is 82.4,the stemflow ratio is 3.49% when the stemflow of Quercus fabri forest is 42.4 mm,and the stemflow ratio is only 0.73% while the stemflow of C.lanceolata forest is 8.9 mm.The interception and its ratio in the five forest stands ranks from big to small as: 384.3 mm and 31.9% in P.amarus forest,355.5 mm and 29.51% in Quercus fabri,280.7 mm and 23.3% in B.rigida,274.1 mm and 22.75% in P.spubescen forest,and 254.8 mm and 21.15% in C.lanceolata forest.