半干旱风沙区人工牧草沙打旺需水规律的研究

STUDY ON WATER REQUIRED RULE OF ARTIFICIAL FORAGE ASTRGALUS ADSURGENS IN SEMI一ARID WIND一SAND AREA

通过对沙打旺需水规律研究，探明了不同土壤湿度与牧草产量、生长速度的关系，分析了灌溉对沙打旺产量、生长速度的影响。结果表明沙打旺对水分盈亏一分敏感，是需水量较多的人工牧草，其产量及生长速度与土壤湿度成正比例关系，当土壤湿度由５７／变化到８０％时，产量增长一倍，各生长阶段适宜湿度值在５７％～８７％之间变化。当干草产量达到６０００ｋｇ／ｈｍ￣２时，需水量为５７００ｍ￣３／ｈｍ￣２。干旱风沙区人工牧草灌溉可以改善土壤湿度，促进牧草生长，提高产量。

Through study on water required rule of A.adsurgens, the paper ascertained relation between soil humidi-ty and yield of herbage and growthiness analysed effect of irrigation on yicld, growthiness of A. adsurgens.The result showed that A.adsurgens was an artificial herbage of water required more,it was highly sensitiveto profit and loss of water.Its yield、growthiness and soil humidity had a positive proportion of relationship. When soil humidity was from 57%～80%,the yield increased by one time. The optimum humidity, wasbetween 57%～87% in all growth periods.Amount of water required was 5700 m3/hm2 while yield of drygrass got to 6000kg/hm2.Artificial forage irrigation could change soil humidity well in arid wind一sandarea,promote forage growth, increase yield of herbage.