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温远光,林建勇,朱宏光,周晓果,叶铎,王磊.南亚热带山地常绿阔叶林林隙及其自然干扰特征研究[J].广西科学,2014,21(5):447-453. [点击复制]
- WEN Yuan-guang,LIN Jian-yong,ZHU Hong-guang,ZHOU Xiao-guo,YE Duo,WANG Lei.Gaps and Their natural Disturbance Regimes in the South Subtropical Montane Evergreen Broadleaved Forest[J].Guangxi Sciences,2014,21(5):447-453. [点击复制]
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| 南亚热带山地常绿阔叶林林隙及其自然干扰特征研究 |
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温远光, 林建勇, 朱宏光, 周晓果, 叶铎, 王磊
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| (广西大学林学院, 亚热带农业生物资源保护与利用国家重点实验室, 广西南宁 530004) |
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| 摘要: |
| [目的]通过对大明山南亚热带山地常绿阔叶林85个林隙的调查,了解南亚热带山地常绿阔叶林林隙的基本特征和自然干扰规律。[方法]在大明山3.2hm2永久样地内仔细寻找每一个林隙,记录林隙形成木的种类,测量其胸径和高度,判断林隙形成木和林隙的年龄,绘制树冠投影图。[结果]扩展林隙(EG)和冠空隙(CG)在南亚热带山地常绿阔叶林中的面积比例分别为71.70%和52.90%,干扰频率分别为1.793%·a-1和1.323%·a-1,林隙干扰的返回间隔期约为76a。南亚热带山地常绿阔叶林中,由树木翻蔸形成的林隙最为普遍,占51.88%,其次是干中折断而形成的,占37.88%。林隙大多由0~1株树木形成,平均每个林隙拥有形成木3.45株。EG的大小多在200~600m2,其中以200~300m2者所占的面积比例最大(占56.47%);CG的大小多在200m2以下,以100~200m2者所占的面积比例最大(占37.65%)。大部分林隙是在2年前形成的,占68.40%。林隙形成木种类超过42种,主要是云贵山茉莉(Huodendron biaristatum)、罗浮槭(Acer fabri)、栓皮木姜子(Litsea suberosa)、百色猴欢喜(Sloanea chingiana)、刨花润楠(Machilus pauhoi)、天目紫茎(Stewartia gemmata)、糙皮桦(Betula utilis)和罗浮柿(Diospyros morrisiana),占形成木个体数的68.51%。林隙形成木分布最多的径级在15~20cm。[结论]南亚热带山地常绿阔叶林林隙特征不同于热带山地雨林,也与南亚热带低地的常绿阔叶林存在显著区别。2008年特大冰冻干扰是造成大明山山地常绿阔叶林林隙分异的主要因素。 |
| 关键词: 南亚热带 山地常绿阔叶林 林隙 自然干扰 冰冻灾害 大明山 |
| DOI：10.13656/j.cnki.gxkx.20141024.007 |
| 投稿时间：2014-07-20 |
| 基金项目:国家自然科学基金项目(39460022,30860059),国家科技支撑计划项目(2011BAC09B02)和广西重大专项计划项目(1222005)资助。 |
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| Gaps and Their natural Disturbance Regimes in the South Subtropical Montane Evergreen Broadleaved Forest |
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WEN Yuan-guang, LIN Jian-yong, ZHU Hong-guang, ZHOU Xiao-guo, YE Duo, WANG Lei
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| (State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Forestry College, Guangxi University, Nanning, Guangxi, 530004, China) |
| Abstract: |
| [Objective] Through field investigation of 85 gaps in 3.2hm2 permanent plots of the south subtropical montane evergreen broadleaved forest in Damingshan Nature Reserve of Guangxi Province, this paper deals with gap characteristics and their natural disturbance regimes in south subtropical montane evergreen broadleaved forest of Guangxi Province.[Methods] Every gap in 3.2hm2 permanent plots of the south subtropical montane evergreen broadleaved forest was carefully investigated.Tree species, DBH (diameter at breast height) and height were recorded in the gaps, and then the age was determined for both the trees growing in gaps and the gap-formation.Finally, the canopy coverage picture was drawn.[Results] The area percentage of expanded gap (EG) and canopy gap (CG) in the forest landscape is 71.70% and 52.90%, respectively.The natural disturbance frequency for EG and CG is 1.793%·a-1 and 1.323%·a-1, respectively, and the return interval of canopy gaps is about 76a.The most popular manner of gap formation in the forest was uproots (51.88% of the total), and the second one was breakage on trunk (37.88%).Most gaps were formed by zero and one tree, averaging 3.45 trees per gap.The size of most EG was in the range of 200~600m2, and the gaps of 200~300m2 occupied the biggest percentage in area (56.47% of the total).The size of most CG was under 200m2, and the gaps of 100~200m2 had the biggest percentage in area (37.65% of the total).Most of the gaps were formed 2 years ago (68.40% of the total).Over 42 wood species were found in gaps, of which dominant species were Huodendron biaristatum, Acer fabri, Litsea suberosa, Sloanea chingiana, Machilus pauhoi, Stewartia gemmata, Betula utilis and Diospyros morrisiana, and their individuals occupied 68.51% of the total ones.The DBH of most trees growing in gaps was 15~20cm.[Conclusion] The gap characteristics and their natural disturbance regimes in south subtropical montane evergreen broadleaved forest in Damingshan Nature Reserve revealed significant difference with those in tropical montane rain forest of Hainan Island and the south subtropical evergreen broadleaved forest in Heishiding Reserve of Guangdong Province, and a severe ice storm damage in 2008 was a main cause. |
| Key words: south subtropical montane evergreen broadleaved forest gaps natural disturbance ice storm damage Daming Mountain |
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