江西大岗山不同密度杉木林林冠截留特征研究

目的]研究不同密度杉木林林冠截留特征.方法]选取江西大岗山生态系统定位研究站不同密度杉木林作为研究对象,分析了不同密度杉木林林冠截留量与降雨量、降雨强度、降雨历时之间的关系,比较不同密度人工杉木林的截留特征.结果]观测期间,试验区总降雨量为501.4mm,6个密度人工杉木林林冠截留量在55.8 ～153.6mm,截留率在11.1％～30.6％,其中N1750林分截留率最大,N2700林分截留率最小,二者截留量相差97.8 mm.1993年营造的3个密度（N970、N1220、N1750）杉木林林冠截留量在117.9 ～153.6 mm范围内,1981年营造的3个密度N2700、N3500、N4700杉木林林冠截留量在55.8 ～78.9 mm范围内.在同一个降雨量和降雨强度下,N970、N1220、N17503个林分平均截留量均大于另外3个林分.结论]不同林龄截留量是有差异的.林冠截留量与降雨量存在着极紧密的正相关,截留率与降雨量呈负相关.在中雨降雨量相近的情况下,降雨强度对截留的影响非常明显,降雨强度越大,截留量越小;在小雨情况下,反而降雨强度越大,截留量越多.

The Research of Chinese Fir Forest Canopy Interception Characteristics with Different Densities at Dagang Mountain of Jiangxi Province

Objective] The interception characteristics of the Cunninghamia lanceolata forest of different densities were studied.Method] This research selected the different densities Cunninghamia lanceolata forest in ecosystem research station of Dagang mountain,Jiangxi province as the object,and we mainly analyzed the relationship between canopy interception and rainfall,rainfall intensity,rainfallduration,and further campared the interception characteristics of the Cunninghamia lanceolata forest of different densities.Result] During the observation,the research area total rainfall was 501.4 mm,the 6 densities Cunninghamia lanceolata forest canopy interception was 55.8-153.6 mm,the interception rate was 11.1％-30.6％,in which the maximum interception rate was N1750,the minimum rate was N2700,the two canopy interception differ by 97.8 ram.The three different densities （N970,N1220,N1750） building in 1993 of Cunninghamia lanceolata forest which interception range within the 117.9-153.6 mm,whereas in 1981,builting three density（N2700,N3500,N4700） of Cunninghamia lanceolata forest which interception range within 55.8-78.9 mm.Under the same rainfall and rainfall intensity condition,the density of N970,N1220,N1750 average canopy interception was greater than the other three densities.Conclusion] Analysis found that stand age has an impact on the canopy interception.There is an intensively correlation between canopy interception and forest rainfall,whereas rainfall have a negative correlation with interception rate.In case of similar rainfall,rainfall intensity have a greater impact on the canopy interception,with the increasing of the rainfall intensity,the canopy interception decreaed.In the case of light rain,with the inceasing of rainfall intensity,the canopy interception increased.