三种水保树种枯落物保水功能

通过对八达岭林场油松、侧柏和刺槐枯落物储量调查分析和持水特性的研究，得到三种树种最大持水量、吸水速率和有效拦蓄量等水文特征参数。结果表明，枯落物储量为油松（29.2 t/hm²） > 刺槐（10.3 t/hm²） > 侧柏（4.7 t/hm²），最大持水量为油松（61.4 t/hm²） > 侧柏（57.9 t/hm²） > 刺槐（43.2 t/hm²），最大持水率为侧柏（471%） > 油松（344%） > 刺槐（196%），平均吸水速率为侧柏≥刺槐 > 油松，有效拦蓄量为刺槐 > 油松 > 侧柏。总的来说，侧柏、刺槐枯落物层保水功能相对要比油松好，侧柏枯落物层保水效果发挥最好。

Water Conserving Function of Litter of Three Water Conservation Tree Species

Maximum water holding capacity, water absorption speed and effective retaining content have been gotten through Surveying and analyzing litter reserves and researching on litter water retention characteristic for pinust abulaeformis,orientalis and robinia in Badaling forest center. Result showed that litter reserves were in the order of pinust abulaeformis(29.2 t/hm²) > robinia(10.3 t/hm²) > orientalis(4.7 t/hm²); maximum water retention capacity followed the sequence of pinust abulaeformis(61.4 t/hm²) > orientalis(57.9 t/hm²) > robinia(43.2 t/hm²); maximum water holdup was in the order of orientalis(471%) > pinust abulaeformis(344%) > robinia(196%); average water absorption speed was in the order of orientalis≥robinia > pinust abulaeformis; effective retaining content was in the order of robinia > pinust abulaeformis > orientalis. In general, water conserving functions of orientalis and robinia were better than pinust abulaeformis, and water retention effect of orientalis showed the best.