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作 者 ：贺金生, 王其兵, 胡东

期 刊 ：植物生态学报 1997年 21卷 6期 页码：512-520

关键词：三峡地区；退化生态系统；灌丛；生物量；砍；

Keywords:The Three Gorges Region, Degraded ecosystems, Shruhland, Biomass, Cutting,

摘 要 ：灌丛是三峡地区典型的退化生态系统类型。本文采用收获法和模拟砍伐实验研究了三峡地区铁仔灌丛、椎木灌丛、荆条灌丛和黄栌灌丛的生物量及黄栌灌丛、椎木灌丛地上部分砍伐后的再生能力。研究结果表明，这4种类型的灌丛总生物量分别为22.5±5.1、21.0±3.7、16.9±7.5和13.6±2.4t·hm-2，相当于同纬度地带性生态系统常绿阔叶林(30年林龄)的10％一25％ 4种灌丛灌木层占总生物量、地上部分生物量和地下部分生物量的90％以上。在生物量—物种序列中，前5种植物占总生物量的84％ 以上。不同地点灌丛生物量的比较表明，同一种类型灌丛，亚热带和暖温带地区总生物量没有明显差异。通过模拟砍伐实验，黄栌灌丛、被木灌丛地上部分全部砍伐后1年地上部分生物量就可以恢复到对照的42.7％和62.0％，说明这些灌丛类型具较高的生长速度和很大的恢复潜力。

Abstract:Shrubland is the typical degraded ecosystems in the Three Gorges Region. In this paper, the biomasses of 4 types of shrublands, such as Myrsine africana,Loropetalum chinense,Vitex: negundo and Cotinus coggygria,and their responses to cutting were investigated with harvest method and cutting experiment. The results show that the biomass of these 4 types of shrublands were 22.5±5.1,21.0±3.7,16.9±7.5 and 13.6±2.4t·hm-2, respectively, being equal to about 10%～25% of that of the typical natural evergreen broadleaved forests (30 years). The shrub layer accounted for 90% of the community in terms of the total or the underground or the above-ground biomass. In the biomass species sequence, the top 5 species amounted to over 84% of the total biomass. The shrublands of the same type were similar in biomass between temperate and subtropical area. That Cotinus coggygria shrub and Loropetalum chinense shrub recovered to 42.7% and 62.0% of aboveground biomass of the control due to one year restoration after cutting, suggests their high growth rate and recovery potential.

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