| 三峡大老岭山地常绿落叶阔叶混交林林隙干扰研究 I．林隙基本特征 |
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| 引用本文： | 沈泽昊,李道兴,王功芳. 三峡大老岭山地常绿落叶阔叶混交林林隙干扰研究 I．林隙基本特征[J]. 植物生态学报, 2001, 25(3): 276-282 |
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| 作者姓名： | 沈泽昊 李道兴 王功芳 |
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| 作者单位： | 沈泽昊（北京大学城市与环境学系，北京100871） 李道兴（湖北宜昌大老岭国家森林公园，宜昌 435000） 王功芳（湖北宜昌大老岭国家森林公园，宜昌 435000） |
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| 基金项目： | 国家自然科学基金项目(30000024)和中国科学院植物研究所植被数量生态学开放实验室基金(LP9908) |
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| 摘 要： | 为探讨我国亚热带山地常绿落叶阔叶混交林的林隙干扰特征，对三峡大老岭地区这一植被类型进行调查，分析了植被中林隙的数量、类型及成因；林隙形成木（GM）的类型、数量、物种构成和径级结构，以及林隙和GM的多尺度空间格局特征。结果表明1）林隙密度为11.7个*hm-2；冠林隙和扩展林隙分别占森林面积的11.09%和27.06%。平均每个林窗的形成木为4.5株；单株GM形成的林隙只占17.46%，其中翻倒木集群性最强。对林隙形成的贡献大小次序是翻倒木>折干>枯立>折枝。2）林隙成因方面冬雪和春、秋冻雨的影响最大；病害影响其次；树木间的牵连和撞击扩大了林隙的范围；陡峭的地形增大林隙形成的机率；干旱的影响很小。3）68种GM主要是森林建群种；常绿树种形成林隙的平均机率高于落叶种。4）GM的胸径结构表明本地森林林隙干扰十分频繁。
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| 关 键 词： | 三峡 山地常绿落叶阔叶混交林 干扰状况 林隙特征 尺度 |
| 修稿时间： | 2000-07-22 |
STUDIES ON THE GAP DISTURBANCE OF THE MOUNTAIN MIXED FORESTS OF EVERGREEN ANDDECIDUOUS BROAD-LEAVED SPECIES AT MT. DALAOLING IN THE THREE GORGES |
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| SHEN Ze Hao LI Dao Xing and WANG Gong Fang. STUDIES ON THE GAP DISTURBANCE OF THE MOUNTAIN MIXED FORESTS OF EVERGREEN ANDDECIDUOUS BROAD-LEAVED SPECIES AT MT. DALAOLING IN THE THREE GORGES[J]. Acta Phytoecologica Sinica, 2001, 25(3): 276-282 |
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| Authors: | SHEN Ze Hao LI Dao Xing and WANG Gong Fang |
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| Affiliation: | SHEN Ze Hao 1 LI Dao Xing 2 and WANG Gong Fang 2 |
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| Abstract: | This paper aims to explore the characteristics of gap disturbances in mixed evergreen/deciduous mountain forests in the Chinese subtropical region. Vegetation plots at Mt. Dalaoling in the Three Gorges region were analyzed according to the quantity, type and causal factors of gaps, the type, number, species composition and size structure of gap makers (GM), as well as the multi scale spatial characteristics of both gaps and GM. The results indicate that: 1) Gap density is 11.7per/hm 2 and the area of canopy gaps and extended gaps occupy 11% and 27% of the forest area respectively. The average number of GM per gap is 4.5, and only 17.46% of all gaps were created by just one GM. Uprooting treefalls were spatially most convergent relative to other types of GM. The order of contributions to gap formation is treefall>trunk snatch>standing death>branch snap. 2) Snows in winter and ice storms in early spring and later autumn play an important role in gap creation, followed in significance by attacks from disease and pests. Gap sizes were usually enlarged by the reciprocal bumping and dragging and consequently mountain topography tends to increase the frequency of gap formation. Drought has little effect on gap formation rates. 3) The dominant species chiefly constitute the GMs, which included 68 tree species in all. Evergreen trees have a larger average probability of producing gaps than deciduous trees. 4) The size structure of GM suggests that the gap disturbance is very frequent in the mountain forest. |
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| Keywords: | Mt. Dalaoling The Three Gorges Mixed evergreen/deciduous mountain forest Disturbance regime Gap properties Scale |
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