中国西北半干旱区弃耕地植被恢复技术的研究--Ⅰ.弃耕地补播技术研究

通过对中国西北半干旱区弃耕地恢复技术的研究,筛选出适宜于西北半干旱区弃耕地植被恢复应用的优良草种,补播时间及补播机具,总结出西北弃耕地植被恢复的关键技术.

Study on Vegetation Recovery Technology of Abandoned Cropland in Semiarid Regions in North-western China

The project of nature grassland protection and conservation of Department of Agriculture of China was conducted from 2000~2005 in Helin County of NeiMongol,where is the eastern part of loess plateau,originally it was belonged to typical grassland type,but right now,it has been changed into abandoned cropland by humanbeing activities.The objectives of this study were emphasized on the vegetation recovery techniques of abandoned cropland by grassland interseeding.The results shown that:(1) 12 forage varieties have been selected for the semiarid region in north-western China,they are very suitable for recovering vegetation of abandoned cropland.5% of water content in soil was needed for them to germinate,otherwise they will be die when the water content of soil drop down to 3%.(2) The suitable covering depth of soil is 1.5~2.5 cm for legumes,and (2.0~4.5) cm for grasses.(3) Interseeding time should be conducted in June before the rainfall is coming.The more,the >5 mm precipitation falls for 5 consecutive days in June,the higher the forages established.(4) Water-holding material,trace elements and bacteria are very important fertilizers for forages germinating.(5) Interseeding techniques can improve the soil conditions after reseeding,such as,soil water content increased by 10.89%,the bulk density of soil decreased by (3.11%),the total content of N,P increased by 38.2%,29.25% respectively,and K decreased by 3.38%.The herbage yield of interseeded pasture increased by 58.4%~392.0% in the second year after reseeding.