干旱区苹果园的田间耗水状况探析

1999-2000年对干旱区5-6年生苹果园生长期实际土壤蒸发量和叶片蒸腾量进行了田间测定分析，结果表明，在较干旱的气候环境条件下，5-10月间单株成龄果树的耗尜量约为8.5t，其中土壤蒸发量占99%以上，实际灌水量仅为6.3t，差额水量的补充则来自于降雨、土壤水分移动和深层根系的吸水作用，干旱区果园60cm土层温度达6.5%左右时为凋萎湿度，田间持水量控制在70%左右，不会影响树体正常生长。

Test of water consumption in apple orchard in arid areas

In 1999-2000 field test was conducted on soil evapor ation and the leaf transpiration of 5～6 years old apple tree arid area orcha r d and the result are as follows: under a dry climate environment, the water cons umption of adult apple tree during May-October is about 8.5　t, among which, mo r e than 99% is soil evaporation. The actual irrigation water is about 6.3　t； th e wa ter difference is supplied by rainfall,soil moisture migration and water absorpt ion of deep root. It will reach the wither moistrue when the soil moistrue stan dard at 60 cm depth of arid area apple orchard is about 6.5%. It won't affect th e normal growth of the trees when soil moisture is kept about 70% of maximum fie ld moistrue capacity.