Changes of water consumption regularity of native tree species in Loess Plateau under different soil water contents

AbstrcatUsing four native tree species of Acer stenolobum Rehd.var.megalophyllum,Ostryopsis davidiana,Sophora viciifolin,Quercus liaotungensis in Loess Plateau as experiment materials and Pot culture experiments simulating different soil water status,this paper mainly deals with water consumption regularity of four native tree species under different soil water contents.The results show that different soil water content have obvious effect on water consumption of four tree species,the trend is normal watermedia droughtsevere drought.The water consumption is lower in April,May,October and higher from June to September,every tree species has obvious different characteristics.Water consumption regulaity of four tree species on growth season changes with different soil water content.Time and date of the highest water consumption of different tree species have notable differences and arrive early with soil water content decreasing,Allocation ratios of total water consumption have obvious differences every month.Acer stenolobum Rehd.var.megalophyllum is sensible to soil water deficit,but it has fine ecological adaptability and higher survival rate.Sophora viciifolin has higher water consumption and high WUE characteristic and the highest water consumption among four tree species,its highest water consumption concentrating on June,July and August and in harmony with Loess Plateau rain seasons.Ostryopsis davidiana has the highest water coefficient and the lowest water consumption and low WUE characteristics.