并用双重筛选逐步回归的方法分析了环境(气候和土壤)因子与植物群落生活型谱梯度的关系，建立了相应的数学模型。
The relationship between environmental factors (climate and soil) and plant life form gradient was analysed by doub sieving progressive regression method, and mathematical models were set up.
本研究对广东中山淡水寡毛类进行了区系调查，对长江中下游13个阻隔湖泊和通江湖泊进行了底栖动物群落环境梯度分析，初步构建了环境指示函数。
The present paper embodies two studies: faunal analysis of aquatic oligochaeta in Zhongshan, South China, and environment gradient analyses of zoobenthos in 13 Yangtze shallow lakes.
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