南亚热带滨海沙地天然常绿阔叶林凋落物持水特性  

Water-holding Characteristics of Litters in Natural Evergreen Broad-Leaved Forests on Coastal Sandy Land in South Subtropical Area

作　　者：吕宗晋 卢立国 谢伟东[1] 张艺帆 Lyu Zongjin;Lu Liguo;Xie Weidong;Zhang Yifan(Forestry College of Guangxi University,Nanning,Guangxi 530004,China)

机构地区：[1]广西大学林学院,广西南宁530004

出　　处：《广西林业科学》2021年第4期367-372,共6页Guangxi Forestry Science

基　　金：国家自然科学基金项目(20120614);广西自然科学基金项目(0832030)。

摘　　要：为滨海植被恢复和水土保持治理提供理论参考,以广西东兴市北仑河口红树林保护区南亚热带海岸带的两个天然常绿阔叶林为研究对象,采用野外调查与室内浸泡法,对凋落物的蓄积量和持水能力进行分析。结果表明,假苹婆(Ster⁃culia lanceolata)(CMT1)和鸭脚木(Schefflera octophylla)+罗伞树(Ardisia quinquegona)(CMT2)两种林分类型的凋落物蓄积量差异不显著,生物量分别为1.46和1.47 t/hm^(2),蓄积量分别为2.92和2.94 t/hm^(2);CMT1半分解层的生物量及蓄积量均高于未分解层,CMT2相反。方程拟合结果表明,不同分解层的持水量与浸泡时间存在对数关系(R2>0.97),吸水速率与浸泡时间存在幂函数关系(R2>0.99)。CMT2凋落物的自然含水率大于CMT1,CMT1凋落物的有效拦蓄量、有效拦截降雨量和有效拦蓄率均高于CMT2;CMT1和CMT2凋落物的有效拦蓄量分别为3.34和2.98 t/hm2;凋落物蓄积量与有效拦蓄量呈显著线性关系。南亚热带两种天然林的单位面积凋落物蓄积量较低,有效拦蓄量偏低,但具有较好的持水能力,利用乡土树种以近自然混交模式对退化的海岸带进行植被恢复,具有良好的水源涵养效益。In order to provide theoretical reference for coastal vegetation restoration and water and soil conserva⁃tion,taking two natural evergreen broad-leaved forests in coastal zone of mangrove reserve in Beilun estuary,Dongxing city,Guangxi as research objects,litter accumulation and water-holding ability were analyzed by field investigation and indoor soaking method.Results showed that there was no significant difference in litter accumulation between two forest types of Sterculia lanceolata(CMT1)and Schefflera octophylla+Ardisia quin⁃quegona(CMT2).Biomass were 1.46 and 1.47 t/hm^(2),and accumulations were 2.92 and 2.94 t/hm^(2).Biomass and accumulation of CMT1 semi-decomposed layer were greater than those of undecomposed layer,and CMT2 was the opposite.Equation fitting showed that water-holding capacity of litter in different decomposition layers had logarithmic relationship with soaking time(R2>0.97),and there was power function relationship between water absorbing rate and soaking time(R2>0.99).Natural moisture rate of CMT2 litter was greater than that of CMT1.Effective storage capacity,effective interception of rainfall and effective storage rate of CMT1 litter were higher than those of CMT2.Effective storage capacity of CMT1 and CMT2 litters were 3.34 and 2.98 t/hm^(2).There was significant linear relationship between litter accumulation and effective storage capacity.Two natural forests in south subtropical area had low litter accumulation per unit area and low effective storage capacity,but they had good water-holding ability.Use of native tree species to restore vegetation in degraded coastal zone by nearnatural mixed mode had good water conservation benefits.

关 键 词：凋落物 持水特性 天然林 南亚热带 

分 类 号：S715.7[农业科学—林学]