一二年生植物在坝上沙质退耕地上的引种筛选

INTRODUCTION AND SELECTION OF ANNUAL PLANT SPECIES ON ABANDONED SANDY FARMLAND IN BASHANG REGION

一二年生植物引种成功的种源区域范围及科属范围都较多年生植物广，而对土壤基质、水分、人为活动等具体生境差异反应明显。最佳的引种植物有临夏燕麦、丹麦４４４燕麦、黑圆箭舌豌豆、３３３Ａ箭舌豌豆及Ｐｈａｌａｒｉｓ属的几个种等。

So far as successful intreduction of plant species is concernd,annul and biennial specieshave much larger source area and the range of families and genera than those of perennial species.However,they have different responses on different soil types,soil moisture conditions and habitatsetc.. The best species for introduction are Arena sativa,Vicia sativa and several species of phalarisgenus.