【摘要】 乔木层、土壤和林下灌草层是侧柏人工林生态系统的重要组成部分,其质量优劣决定了生态系统的稳定性。以鲁中山地3个试验地的23个典型侧柏人工林为研究对象,通过野外调查和室内分析,采用因子分析法分别研究了侧柏林乔木层、土壤和林下灌草层的综合质量,进而计算得出侧柏人工林生态稳定性指数,从而对其生态稳定性进行了评价。按稳定性指数大小将侧柏林生态系统分为四个稳定性等级,分别为"高度稳定""中度稳定""低度稳定"和"不稳定"。通过相关性分析,筛选出14个观测指标共同组成侧柏林稳定性评价指标集。采用这些指标,可利用多元回归方程和逐步回归方程对侧柏林稳定性指数进行预测,推荐在侧柏林生态系统稳定性评价时选择使用。更多还原

【Abstract】 Arbor layer, soil and shrub grass layer are important components of Platycladus orientalis plantation ecosystem, whose quality determines the stability of ecosystem. In this paper, 23 typical Platycladus orientalis plantations in three sits in the center of Shandong province were studied. Through field investigation and indoor analysis, the comprehensive quality of arbor layer, soil and undergrowth shrub and grass layer of Platycladus orientalis plantations was studied by factor analysis method. Then the ecological stability index of Platycladus orientalis plantations was calculated, and the ecological stability of Platycladus orientalis plantations was evaluated. According to the stability index, the stability of the Platycladus orientalis ecosystem can be divided into four levels, ie. high stability, medium stability, low stability and instability. Through the correlation analysis, a total of 14 observation indicators were selected to form the index set of stability evaluation. These indexes are used to predict the stability index of Platycladus orientalis plantations by using multiple regression equation and stepwise regression equation, which is recommended to be used in the evaluation of the stability of Platycladus orientalis plantations ecosystem.更多还原