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森林资源减少是区域生物多样性下降的重要原因之一,明确影响区域生物多样性变化的关键森林景观因子对深入了解森林景观对区域生物多样性的影响机制具有重要意义。以鄱阳湖生态经济区为研究对象,从森林景观的数量、质量、分布等方面选取11个指标,通过相关分析、弹性分析和线性回归分析研究森林景观指标与区域生物多样性的关系。结果表明,所选用的表征森林景观的指标,除平均树高外,均与区域生物多样性显著相关(显著水平0.05),与森林密度(每公顷株数)的相关性最好;区域生物多样性对平均胸径变动的敏感程度最强,森林景观分布均衡度次之,有林地面积最弱;采用逐步回归法,建立了多元回归方程,表明在多因素综合影响下,影响区域生物多样性的主要指标作用大小为:活立木蓄积量>每公顷株数>平均胸径>森林景观分布均衡度>林地面积。研究结论为科学管理森林景观,提高区域生物多样性提供了一定依据。
Decreasing forest resources is one of the important reasons for the decline of biodiversity in the region. It is of great significance to clarify the key forest landscape factors that affect the changes of biodiversity in the region to understand the impact mechanism of forest landscape on regional biodiversity. Taking Poyang Lake Eco-economic Zone as the research object, eleven indexes were selected from the aspects of quantity, quality and distribution of forest landscape, and the relationship between forest landscape index and regional biodiversity was analyzed through correlation analysis, elasticity analysis and linear regression analysis. The results showed that all the selected indicators of forest landscape were significantly related to the regional biodiversity (significant level 0.05), except for the average tree height, and had the highest correlation with the forest densities (per hectare). The regional biodiversity The most sensitive to the change of average diameter at breast height, followed by the balanced distribution of forest landscape, and the weakest area of forest land. Using the stepwise regression method, a multiple regression equation was established, indicating that under the influence of multiple factors, the main factors influencing regional biodiversity Indicators of the role of size: standing stock volume> Hectares per hectare> average diameter at breast height> distribution of forest landscape> forest area. The conclusion of the study provides a certain basis for scientific management of forest landscape and improvement of regional biodiversity.