黄土峁状丘陵区牧草引种及立地水分动态研究

为丰富黄土高原峁状丘陵区牧草种质资源,为退耕还林还草提供科技支撑,自1998年起从国内外陆续引进牧草品种4科、14属、36种100余份,经5年的适应性驯化,鉴选出了适宜该区生态条件的优质牧草4科9属21种.鉴选出的良种牧草抗旱、耐瘠薄、优质、高产,在坡地退耕还草中有重要意义.同时对其立地条件进行了研究,结果表明不同牧草对立地土壤水分利用强度及空间分布有很大的差异,提出了不同牧草混播比例及立地范围.

Introduction and Site-moisture Dynamics of Herbages in the Hilly and Gully Regions of the Loess Plateau

Since 1998,more than samples of 36 species,14 genera and 4 families of herbages had been introduced one after another to enrich the germplasms for the hilly and gully regions of the Loess Plateau and provide technical supports to the transformation of farmlands into forestlands and grasslands.They had been domesticated for five years and then the quality herbages 21 species;9 genera and 4 families of quality herbages capable of well adapting to the ecological conditions were screened.These herbages are of importance in the transformation of farmlands into forestlands and grasslands because of their drought resistances,barrenness tolerance,high yield and high quality.Meanwhile,their planting sites were also studied;different herbages were found to differ in their soil water use intensities and depths and thus the proportions and site conditions for their mixed seeding were determined.