东北东部山地蒙古栎林的年龄结构及天然更新研究  

Research on age structure and natural regeneration of Quercus mongolica forest on eastern mountains in Northeast region

作　　者：姜玲玲 许中旗[1] JIANG Lingling;XU Zhongqi(College of Forestry,Hebei Agricultural University,Baoding 071000,China)

机构地区：[1]河北农业大学林学院,河北保定071000

出　　处：《林业与生态科学》2020年第4期365-368,376,共5页Forestry and Ecological Sciences

基　　金：国家重点研发计划(2019YFF0303203)。

摘　　要：为了解东北东部山地蒙古栎林的天然更新状态及过程,以东北东部山地的蒙古栎林为研究对象,对其年龄结构及各林层蒙古栎的生长状况进行了研究。结果表明:蒙古栎林存在数量巨大的幼苗库,5 a生以下的幼苗密度达到6000株/hm2,但实生苗数量随年龄增加呈明显下降的趋势,6~10 a生幼苗密度只有75株/hm2,同时,林下未出现10 a生以上实生苗;蒙古栎林的年龄结构在21~35 a之间存在明显的断层;更新层幼苗的高生长呈逐年下降的趋势,演替层蒙古栎的年径生长量明显低于主林层。由此得出结论,蒙古栎因其喜光的生态学特性,林下的天然更新过程受阻,林下幼苗库处于不断死亡和补充的动态变化之中,天然或人工采伐林隙的形成可促进更新层蒙古栎幼苗的生长,促进蒙古栎林的天然更新。In order to understand the natural renewal status and process of Quercus mongolica forest,the age structure of Quercus mongolica forest and the growth status of each forest layer were studied.The results showed that there was a huge seedling pool in Mongolian oak forest.The density of seedlings under 5 years old reached 6000/hm2,but the number of seedlings decreased significantly with the increase of age.The density of seedlings between 6 to 10 years old was only 75/hm2,and no seedlings above 10 years old appeared in the forest.The age structure of Mongolian oak forest has obvious fault between 21 and 35 years.The high growth of seedlings in the regeneration layer decreased year by year,and the annual diameter growth of the succession layer was significantly lower than that of the main forest layer.Therefore,it is concluded that the natural regeneration process of Quercus mongolica is blocked due to its photophilic ecological characteristics,and the abundant seedling bank under the forest is in the dynamic change of continuous death and replenishment.The formation of natural or artificial cutting gap can promote the growth of Quercus mongolica seedlings in the regeneration layer,and promote the natural regeneration of Quercus mongolica forest.

关 键 词：蒙古栎 年龄结构 更新 幼苗库 

分 类 号：S792.186[农业科学—林木遗传育种]