红砂育苗的土壤水分管理初步研究

分布于60~300 mm降水量区域的超旱生半灌木红砂,是该区域的建群种，也是人工辅助植被恢复的主要树种,探索其幼苗成活与土壤含水量之间的关系,对人工辅助恢复植被十分重要。以不同苗龄的红砂容器苗和直播实生幼苗为调查对象，研究了红砂幼苗成活数量与土壤含水量之间的相关性。结果表明：10 cm土层中的体积含水量在20~25 d内持续达20%~30%时，其成活率达到70%左右；25 d以后，含水量在10%时就能维持其生命，苗龄30~40 d后幼苗成活率趋于稳定。

Management of Soil Moisture for Growing Reaumuria soongorica Seedlings

The xerophil shrub Reaumuria soongorica which distributes at the area of rainfall from 60 mm to 300 mm is both the constructive species of this area and the primary plant for man-made auxiliary vegetation restoration.So it is important to study the relationship between the survival rate of Reaumuria soongorica seedlings and soil moisture content.The study objects are Reaumuria soongorica container seedlings and direct sowing tree seedlings of various ages.We studied the relation between soil moisture content during the period of Reaumuria soongorica seedlings and their survival rate.It showed that the survival rate of Reaumuria soongorica seedlings reached about 70% when the soil moisture content in the soil layer of 0~10 cm persisted about at least 20%~30% in the 20th to 25th day;the Reaumuria soongorica seedlings could maintain survival when the soil moisture content in the soil layer of 0~10 cm was at least 10% after the 25th day;the survival rate of Reaumuria soongorica seedlings tended to stabilize after the 30th to 40th day.