Intensive land-use drives regional-scale homogenization of plant communities
Intensive land-use drives regional-scale homogenization of plant communities
复制标题
土地集约利用导致植物群落区域范围均质化
DOI：
10.1016/j.scitotenv.2018.07.019
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发表时间：
2018-12-10
影响因子：
9.8
通讯作者：
Zhang, Qing
中科院分区：
文献类型：
--
作者：
Liu, Qingfu;Buyantuev, Alexander;Zhang, Qing
密集的人为土地利用导致栖息地丧失和景观同质化，从而导致生物多样性减少和生态系统退化。因此，研究景观异质性对生物多样性的影响具有重要意义。本研究对位于中国内蒙古农牧交错带的塔布河流域 53 个地点进行了植被调查，发现了 146 种植被。物种多样性在三个尺度上进行评估：斑块内的物种丰富度（α多样性）、斑块之间的物种丰富度（β多样性）和景观尺度（γ多样性）。我们分析了景观异质性（LHtotal）及其驱动因素，包括环境变量（LHDFenv-var，例如降水量和海拔）、环境异质性（LHDFenv-het）和人类活动（LHDFhum）。我们使用结构方程模型（SEM）来评估三个尺度上物种丰富度对景观异质性的响应，并确定驱动因素在解释这些尺度上物种多样性时的相对贡献。研究结果概括如下：1）内蒙古塔布河流域α多样性是γ多样性的主导成分。 2）α多样性与LHtotal之间不存在显着相关性（P=0.512）；随着LHtotal beta和gamma多样性的增加呈现驼峰状关系。 3）LHDFenv-het是维持α多样性的主要因素，年平均降水量（MAP）、温度（MAT）和海拔（ALT）的异质性是三个最大的影响因素。 LHDFhum 主要有助于维持 beta 多样性。 4) LHDFhum 是伽马多样性的主要贡献者，人类活动超过了积极影响的阈值。根据我们的发现，我们建议沿河施石灰农业用途，以防止物种多样性减少。
Intensive anthropogenic land-use causes habitat loss and landscape homogenization, which leads to the decrease of biodiversity and ecosystem degradation. Therefore, it is important to study the influence of landscape heterogeneity on biodiversity. In this study, vegetation surveys conducted at 53 sites in the Tabu River basin, located at the agro-pastoral ecotone of Inner Mongolia of China, revealed 146 species. Species diversity was evaluated at three scales: species richness within patches (alpha diversity), between patches (beta diversity) and at the landscape scale (gamma diversity). We analyzed landscape heterogeneity (LHtotal) and its driving factors including environmental variables (LHDFenv-var, such as precipitation and altitude), environmental heterogeneity (LHDFenv-het) and human activities (LHDFhum). We used structural equation modeling (SEM) to evaluate the response of species richness to landscape heterogeneity at three scales and determined the relative contribution of driving factors in explaining species diversity at these scales. The results of the study are summarized as follows: 1) Alpha diversity was the dominant component of gamma diversity in the Tabu River basin in Inner Mongolia. 2) There is no significant correlation (P=0.512) between alpha diversity and LHtotal; with the increase of LHtotal beta and gamma diversities showed hump-shaped relationships. 3) LHDFenv-het was the primary factor in maintaining alpha diversity, with heterogeneity of mean annual precipitation (MAP), temperature (MAT) and altitude (ALT) acting as three largest contributors. LHDFhum primarily contributed to the maintenance of beta diversity. 4) LHDFhum was the primary contributor to gamma diversity, and human activity exceeded threshold values for positive effects. Based on our findings we suggest liming agricultural use along the river to prevent reductions in species diversity.