successional series meaning in English

演替系列

Based on analysis of soil physical , chemical and biological properties , soil properties and soil integrated fertility index ( iff ) of different successional series of subalpine coniferous in western sichuan were systematically studied . the results showed soil fertility degradation of subalpine coniferous forests was mainly related to decrease of soil organic matter
从土壤物理、化学和生物学性质角度出发，系统地研究了四川西部亚高山针叶林不同演替阶段土壤性质和土壤综合肥力指标值，结果表明：川西亚高山针叶林土壤性质主要受土壤有机质的影响，人工林地土壤肥力质量退化主要由于有机质的减少并导致相关土壤物理、化学和生物学性质恶化。