景观干扰对乡村半自然生境植物多样性的 影响分析

乡村半自然生境植物多样性的影响分析，有助于推 动乡村生态景观高质量发展。村以下尺度乡村植物多样性研究 存在生境类型分析不全面、景观影响因子单一化、定量干扰机 制不深入等问题。在南京江宁西南部乡村地区，采用逐步回归 模型和广义加性模型，探讨了多种景观干扰对6类乡村半自然 生境植物多样性的影响，并提出了基于乡村植物多样性维持的 景观响应策略。结果表明：1)乡村景观格局、景观管理强度 和类型等对不同半自然生境植物多样性产生了显著影响，其综 合解释度约为10%~50%，小规模林斑、连接度高的半自然生 境、小面积池塘(<0.8hm2 )、茶田景观粗放管理方式、乡土 树种混交林等对植物多样性的正向促进作用显著；2)在所有显 著性指标中，斑块面积、斑块隔离度对各类半自然生境植物多 样性的影响最为突出，是驱动乡村植物多样性变化的重要景观 因素。

Analysis of the Impact of Landscape Disturbance on Plant Diversity in Rural Semi-natural Habitats

The impact analysis of plant diversity in rural seminatural habitats is helpful to promote the high-quality development of rural ecological landscape. In the study of rural plant diversity at the sub-village scale, there are problems such as incomplete analysis of habitat types, simplification of landscape impact factors, and no in-depth quantitative interference mechanisms. In the rural areas in southwestern Jiangning, Nanjing, the research explored the impact of multiple landscape disturbances on plant diversity in six types of rural semi-natural habitats by using stepwise regression models and generalized additive models, and proposed landscape responses strategy based on the maintenance of rural plant diversity. The results show that: 1) Rural landscape pattern, intensity and type of landscape management had a significant impact on plant diversity in different semi-natural habitats, and the comprehensive explanation degree was about 10%-50%. Small-scale forest patches, highly connected semi-natural habitats, small ponds (<0.8hm2 ), extensive management of tea field landscapes, and mixed forests of native tree species have a significant positive effect on plant diversity. 2) Among all the significant indicators, the patch area and the isolation degree of patches have the most prominent impact on the plant diversity of various semi-natural habitats, and are important landscape factors driving the change of rural plant diversity.