三种速生人工林凋落物的持水性能

在广西国营高峰林场界牌分场选择立地条件、营林和管理措施、林分长势基本一致的5年生尾巨桉无性系3229(Eucalyptus3229)、厚荚相思(Acaciac rassicarpa)和马占相思(Acacia mangium)速生人工林,采集林下凋落物测定单位面积储量、持水量、持水率和持水速率,研究3种速生树种人工林下凋落物的持水性能。结果表明,厚荚相思凋落物的持水量和持水率最大,分别达18.40×103kg.hm-2和70%,尾巨桉3229的次之,分别为17.34×103kg.hm-2和50%,马占相思的最小,分别是13.49×103kg.hm-2和45%。厚荚相思和尾巨桉无性系3229的持水性能比马占相思的强。

Studies on the Water Holding Capacity of Three Kinds of Trees Litter

In the Jiepai Branch of Gaofeng state-owned Forest Farm of Guangxi, the five-years-old fast-growing plantation of Eucalyptus3229, Acacia crassicarpa and Acacia mangium were chosen by the same sites, the same planting and management treatment and the alike growing status to study the water holding capacity of the litters of the three kinds of fast-growing plantation by measuring the standing crop, water holding, proportional water holding capacity and water holding rate. The results showed that the water holding and proportional water holding capacity of A.crassicarpa were the largest, and reached 18.40×10³ kg·hm^-2 and 70% respectively, followed by Eucalyptus3228, were 17.34×10³ kg·hm^-2 and 50% respectively, and the lowest in A.mangium, were 13.49×10³ kg·hm^-2 and 45% respectively.The result indicated that Eucalyptus3229 and A.crassicarpa plantation were stronger than A.mangium in water holding capacity.