摘要
【目的】通过研究湘南红壤区互叶白千层人工林枯落物层和土壤的蓄水能力,探明互叶白千层人工林水文特征和水源涵养功能,为我国南方红壤区水土保持林的构建提供科学依据。【方法】2018年10月在湖南省宁远县互叶白千层人工林种植园,选择4种林龄(1、3、5、7 a)的互叶白千层作为研究对象,以荒坡地为对照(CK),采集枯落物层和土壤层(0~20、20~40、40~60 cm),采用浸泡法、环刀法分别测定枯落物层和土壤层的持水能力。【结果】1)4种林龄互叶白千层人工林及荒坡地林下枯落物层现存量为0.59~2.14 t·hm^(-2),表现为7 a>5 a>3 a>1 a>CK;最大持水量为1.897~6.345 t·hm^(-2),有效拦蓄量为1.475~4.787 t·hm^(-2),均表现为7 a>5 a>3 a>CK>1 a;枯落物层持水量、吸水速率与浸水时间存在较好的函数关系。2)4种林龄互叶白千层人工林及荒坡地土壤容重均值为1.18~1.35 g·cm^(-3),随林龄或土层深度的增加而增大,总孔隙度为49.3%~60.6%,毛管孔隙度为32.2%~37.3%,非毛管孔隙度为17.2%~23.3%,随林龄或土层深度增加而减小。3)4种林龄互叶白千层人工林及荒坡地0~60 cm土壤有效持水量为1030~1396 t·hm^(-2),土壤饱和持水量为2960~3634 t·hm^(-2),均表现为CK>1 a>3 a>5 a>7 a。4)林地蓄水能力为1034.787~1397.533 t·hm^(-2),表现为CK>1 a>3 a>5 a>7 a,其中土壤有效持水量占林地蓄水能力的比例超过99.5%。【结论】不同林龄互叶白千层人工林蓄水能力存在显著差异,且随林龄的增加而逐渐衰弱。
【Objective】In order to explore the water-holding capacity and water-containing function of the plantation forest of Melaleuca alternifolia,so as to provide scientific basis for the construction of soil and water conservation forest in the red soil area of southern China.【Method】In October 2018,in Ningyuan county,Hunan province,four types of forest age(1 a,3 a,5 a,7 a)of Melaleuca alternifolia were selected as the research objects,and the barren slope was selected as the control(CK).Litter and soil(0-20 cm,20-40 cm,40-60 cm)were collected to measure the water holding capacity of litter layer and soil layer by soaking method and ring knife method respectively.【Result】1)The litter accumulation of Melaleuca alternifolia plantation and barren land is 0.59-2.14 t·hm^(-2),showing as 7 a>5 a>3 a>1 a>CK,the maximum water holding capacity is 1.897-6.345 t/hm2,and the effective storage capacity is 1.475-4.787 t/hm^(2),both of which are 7 a>5 a>3 a>CK>1 a.There is a good functional relationship between the water holding capacity and water absorption rate of litter and soaking time.2)The average soil bulk density of Melaleuca alternifolia plantation and barren slope is 1.18-1.35 g·cm^(-3),which increases with the increase of stand age or soil depth.The total porosity is 49.3%-60.6%,the capillary porosity is 32.2%-37.3%,and the non-capillary porosity is 17.2%-23.3%,all of which decrease with the increase of forest age or soil depth.3)The effective water holding capacity of soil(0-60 cm)in Melaleuca alternifolia plantation and barren slope is 1030-1396 t·hm^(-2),and the saturated water holding capacity of soil is 2960-3634 t·hm^(-2),both of which are CK>1 a>3 a>5 a>7 a.4)The water storage capacity of Melaleuca alternifolia and barren land is 1034.787-1397.533 t·hm^(-2),showing as CK>1 a>3 a>5 a>7 a.Among them,the effective water holding capacity of soil accounts for more than 99.5%of the water storage capacity of forest.【Conclusion】There are significant differences in water storage capacity of Melaleuca alt
作者
罗航
何介南
康文星
罗静
李翔
LUO Hang;HE Jienan;KANG Wenxing;LUO Jing;LI Xiang(College of Forestry,Central South University of Forestry&Technology,Changsha 410004,Hunan,China;Laboratory of Soil and Water Conservation&Desertification Control,Changsha 410004,Hunan,China;National Engineering Laboratory for Applied Technology of Forestry&Ecology in South China,Changsha 410004,Hunan,China)
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2021年第5期102-109,132,共9页
Journal of Central South University of Forestry & Technology
基金
湖南省科技厅项目“湘南红壤丘陵区澳洲茶树种植技术应用推广与示范”(2019NK3031)。
关键词
互叶白千层
枯落物
土壤理化性质
水源涵养
湘南
Melaleuca alternifolia
litter
soil physical and chemical properties
water conservation
southern Hunan
