闽中山地天然林林隙动态及自然干扰特征

对大田县龙坑村尖奇山天然林中7个林隙进行调查, 探讨了闽中山地天然林林隙基本特征和自然干扰规律 该天然林林隙形状近似于椭圆形或近圆形, 椭圆的长短轴比率不随林隙大小而变化, 都在1 14左右; 扩展林隙(EG)和树冠空隙(CG)在热带山地雨林景观中的面积比例分别为78 61%和27 66%, 干扰频率分别为1 572%·a-1和0 553%·a-1 林隙干扰返回间隔期约为180a EG大小为300 ~1 000m2, 平均约为560m2, 大多数CG大小为80 ~400m2,平均约为200m2 大多数林隙是在50a以内形成的, 而10 ~50a之前形成的林隙最多 大多数林隙是由1~5株形成木创造的, 而由2~4株形成木创造的林隙最多 林隙形成木通过干基折断死亡的形式存在 龙坑村尖奇山天然林中的林隙主要是由10余个树种创造的,其中不仅有第1层的树种, 而且还有第2、3层的树种 最后以林隙动态理论为基础, 对闽中山地常绿阔叶林的经营提出了参考意见

Gap dynamic and their natural disturbance characteristics in mid-Fujian montane natural forest

Through field investigation of 7 gaps in Jianqi Mountain natural forest in Longkeng Village of Datian County, the gap characteristics and their natural disturbance characteristics in mid-Fujian montane natural forest were studied in this paper. Gaps in the natural forest are elliptic or nearly round in horizontal forms, the ratio of long axis to short axis for each gap is about 1.14. The area percentage of expanded gap(EG) and canopy gap(CG) in the forest landscape is 78.61% and 27.66% respectively. The natural disturbance frequency for EG and CG is 1.572%·a~(-1) and 0.552%·a~(-1) respectively, the return interval of canopy gaps is about 180 a. The size of most EG in the tropical montane rain forest range from 300 m~2 through 1 000 m~2, averaged about 560 m~2. And the size of most CG in the forest range from 80 m~2 through 400 m~2, averaged about 200 m~2. Most gaps were formed within 50 years, and most of which aged 10-50 a. Most gaps were made by 1-5 gap makers, of which 2-4 gap makers gaps are the majority. The dead gap makers were breaked at trunk base. Major gap makers are more than 10 tree species that are not only tree species in the first canopy layer, but also tree species in the second and third layers. Finally, based on the studies of gap dynamics, some suggestions were put forward to manage mid-Fujian montane natural forest.