Brown Kerry A, Gurevitch Jessica
Department of Ecology and Evolution, Stony Brook University, Stony Brook, NY 11794-5245, USA.
Proc Natl Acad Sci U S A. 2004 Apr 20;101(16):6045-9. doi: 10.1073/pnas.0401456101. Epub 2004 Apr 5.
Ecological perturbations can either be necessary for maintaining tropical forest diversity or responsible for its decline, depending on the scale, nature, and frequency of the disturbance. Anthropogenic disturbances such as logging and subsistence agriculture may promote the establishment of nonnative, invasive plant species, potentially affecting forest structure and diversity even long after the perturbation has ceased. We investigated the impacts of logging 50 and 150 years ago on tropical forest vegetation in Madagascar, a "hotspot" of biodiversity. Logging was the overriding factor influencing establishment of nonnative plants. Sites once logged never recovered native species diversity because of the dominance and persistence of invasive species.
生态扰动对于维持热带森林多样性可能是必要的,也可能是导致其衰退的原因,这取决于干扰的规模、性质和频率。诸如伐木和自给农业等人为干扰可能会促进非本地入侵植物物种的建立,即使在扰动停止很久之后,也可能对森林结构和多样性产生影响。我们调查了50年前和150年前的伐木活动对生物多样性“热点”马达加斯加热带森林植被的影响。伐木是影响非本地植物建立的首要因素。由于入侵物种的优势地位和持久性,曾经被砍伐的地区从未恢复本地物种的多样性。