fibrous roots短语⁷⁹⁹⁷⁸⁺⁹ 基本例句 髫根 The factors affecting fibrous roots size besides the planting vegetation, it has signal positive correlation to thickness of soil, thick soil is good to the growth and development of plant roots. 影响须根量的因素，除植被因素外，与土层厚变显著正相关，深厚土壤有利于植物根系的生长发育。 cnki