韶关地区6种阔叶树种幼林的凋落物持水特性研究

Water Holding Characteristics of Litter in Six Young Broadleaved Stands in Shaoguan Region

对3年生樟树(Cinnamomum camphora)、大叶女贞(Ligustrum lucidum)、观光木(Tsoongioden-dron odorum)、山杜英(Elaeocarpus sylvestris)、乳源木莲(Manglietia yuyuanensis)和乐昌含笑(Michelia chapensis)的幼林凋落物持水特性进行了研究。结果表明,各林地的凋落物最大持水量为乳源木莲林地>乐昌含笑林地>大叶女贞林地>观光木林地>樟树林地>山杜英林地。林地凋落物的最大持水率呈现观光木林地>乳源木莲林地>乐昌含笑林地>樟树林地>山杜英林地>大叶女贞林地。凋落物持水量和浸泡时间的关系及凋落物持水率与浸泡时间的关系按照对数方程变化,凋落物吸水速率与浸泡时间的关系按照负指数方程变化。

The water holding characteristics of litter in the six young broadleaved stands of Cinnarnornum carnphora , Ligustrurn lucidurn , Tsoongiodendron odorum , Elaeocarpus sylvestris , Manglietia yuyuanensis, and Michelia chapensis were studied. By the water holding capacity of litter, the stands was in the order of M. yuyuanensis woodland 〉 M. chapensis woodland 〉 L. lucidum woodland 〉 T. odorum woodland C. carnphora woodland 〉E. sylvestrls woodland. By the proportional water holding capacity as a percentage of the litter dry weight, the stands were in the order of T. odorum woodland 〉M. yuyuanensis woodland 〉M. chapensis woodland 〉C. camphora woodland 〉E. sylvestris woodlandS〉 L. lucidum woodland. The total water holding capacity and proportional water holding capacity of litter increased logarithmically with increasing time immersed in water. Water absorption rates of litter in all plantations decreased with increasing time immersed in water by a negative exponential relation.