摘要
[目的]探究百里杜鹃景区马缨杜鹃林下凋落物覆盖对土壤蒸发的影响,为其林下水源涵养功能的发挥提供科学依据。[方法]根据土壤蒸发理论,采用自制微型蒸渗装置进行模拟试验,参照百里杜鹃林下凋落物现存状况,研究不同质量相同比例及相同质量不同比例的凋落物覆盖对土壤蒸发抑制的影响。[结果]不同分解程度凋落覆盖比例相同质量不同时,土壤水分蒸发量随凋落物的质量增大而减小;土壤水分蒸发量随着土壤含水率的下降呈递减关系,当含水率每下降0.5%时,60,30和15 g凋落物覆盖的土壤水分蒸发量分别依次减少了0.11,0.49和1.23 g。凋落物覆盖质量相同时,不同分解程度的凋落物对土壤水分蒸发抑制作用不同,表现为:未分解>半分解>已分解。[结论]凋落物覆盖量越多,对土壤蒸发的抑制作用越大;凋落物分解程度越低,对土壤蒸发的抑制作用越好。
[Objective]The effects of litter cover on soil evaporation in the Rhododendron delavayi forest in Baili azalea scenic area were studied,in order to provide a scientific basis for the function of water conservation under the forest.[Methods]According to the theory of soil evaporation,a self-made micro evaporation and infiltration device was used to conduct the simulation experiment.The existing status of litter under the Baili rhododendron forest was taken as a reference,to study the effect of litter with different mass and different proportion on the inhibition of soil evaporation.[Results]The evaporation of soil water decreased with the increase of litter mass at different decomposition degrees and with the same litter coverage ratio.The evaporation of soil moisture decreased with the decrease of soil moisture contents.When the moisture contents decreased by 0.5%,the evaporation of soil moisture with litter cover of 60 g,30 g and 15 g decreased by 0.11 g,0.49 g and 1.23 g,respectively.When the cover quality of litter was the same,the inhibition of litter with different decomposition degrees on soil water evaporation was different,which showed as follows:undecomposed>semi-decomposed>decomposed.[Conclusion]The more litter cover,the greater the inhibition of soil evaporation;the lower the decomposition degree of litter,the better the inhibition of soil evaporation.
作者
陈明梅
李苇洁
杨瑞
张建利
王加国
Chen Mingmei;Li Weijie;Yang Rui;Zhang Jianli;Wang Jiaguo(College of Forestry,Guizhou University,Guiyang,Guizhou 550025,China;Institute of Mountain Resources of Guizhou Province,Guiyang,Guizhou 550001,China)
出处
《水土保持通报》
CSCD
北大核心
2019年第6期60-65,共6页
Bulletin of Soil and Water Conservation
基金
国家自然科学基金项目“百里杜鹃景区马缨杜鹃林凋落花朵对枯落物分解及其主要水文功能的影响”(41561109)。
关键词
百里杜鹃
马缨杜鹃林
凋落物
影响
土壤水分蒸发
Baili azalea
Rhododendron delavayi forest
litter
influence
soil moisture evaporation
作者简介
第一作者:陈明梅(1992-),女(汉族),贵州省遵义市,硕士研究生,研究方向为森林生态。E-mail:492131353@qq.com;通讯作者:李苇洁(1977-),女(汉族),贵州省贵阳市,硕士,研究员,主要从事森林生态及经济林栽培研究。E-mail:lwj024333@163.com。
