摘要
森林土壤作为森林涵养水源的主要场所,可能通过对降水的再分配作用对森林生态系统水循环产生重要影响.为探究高寒地区不同森林生态系统土壤持水差异,以地处高山峡谷区的6种不同类型亚高山彩叶林为对象,以裸地为对照,在2018年8月至2019年5月间,通过生长季和冻融季节前、后采样监测不同林分土壤的持水动态特征.结果显示:川西亚高山彩叶林群落土壤现存贮水量在生长季、冻融前和冻融后分别为25.13-287.55 mm、31.15-230.62 mm和38.68-307.15mm.彩叶林群落土壤间的持水性存在差异,土层厚度高的裸地(bareland,BL)和落叶松林(Larixgmelinii forest,LF)土壤持水量高,而亮叶桦-青麸扬林(Betulaluminifera-Rhuspotaniniiforest,BRF)土壤持水率更大,其不同时期下的毛管持水率、非毛管持水率、最大持水率和最小持水率分别为139.66%-221.35%、64.63%-102.48%、204.29%-323.83%和93.48%-132.46%,持水能力强.同时,林分土壤的持水性随季节改变,在冻融后,林分土壤贮水量、持水量显著增加,而持水率有不同程度的增加.本研究表明群落环境和土壤结构不同使彩叶林群落土壤间持水性存在差异,且冻融循环通过改变土壤物理结构可提高土壤持水能力;上述研究结果可为改善该区域彩叶林水文生态功能提供科学数据.
Forest soil plays an important role in water cycling,as it is the main place to conserve water by redistributing precipitation in forest ecosystems.To explore the differences in soil water holding capacity of different forest ecosystems in subalpine regions,six types of colored-leaf forests located in alpine valleys were selected,and bare land(BL)was used as control.The water holding characteristics of the forest soils were monitored by sampling in the growing season and before/after the freeze-thaw season,from August 2018 to May 2019.The results showed that soil water storage in subalpine colored-leaf forest communities in western Sichuan were 25.13-287.55 mm during the growing season,31.15-230.62 mm before the freeze-thaw season,and 38.68-307.15 mm after the freeze-thaw season.Water-holding capacity of the soil differed among coloredleaf forest communities.Thicker soil in the BL and Larix gmelinii forest exhibited higher water holding capacity,while Betula luminifera-Rhus potaninii forest(BRF)exhibited higher soil water holding rate.The capillary water holding rate,non-capillary water holding rate,maximum water holding rate,and minimum water holding rate of BRF in different periods was 139.66%-221.35%,64.63%-102.48%,204.29%-323.83%,and 93.48%-132.46%,respectively,which meant the soil water holding ability of BRF was stronger.Simultaneously,forest soil waterholding capacity varied with the seasons.After the freeze-thaw cycle,forest soil water storage and water holding capacity increased significantly,and the water holding rates increased to varying degrees.In summary,different community environments and soil structures resulted in differences in water-holding characteristics of the soil in colored-leaf forest communities.Freeze-thaw cycle may improve soil water holding ability by changing the physical structure of the soil.These results can provide information for improving the hydro-ecological functions of colored-leaf forests in this region.
作者
刘一霖
温娅檬
张玉
谭波
游成铭
张丽
杨万勤
徐振锋
李晗
LIU Yilin;WEN Yameng;ZHANG Yu;TAN Bo;YOU Chengming;ZHANG Li;YANG Wanqin;XU Zhengfeng;LI Han(Forestry Ecological Engineering in the Upper Reaches of the Yangtze River Key Laboratory of Sichuan Province,National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River,Long-term Research Station of Alpine Forest Ecosystems,Institute of Ecology&Forest,Sichuan Agricultural University,Chengdu 611130,China;Da’an Bureau of Natural Resources,Zigong,Zigong 611130,China)
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2021年第3期648-656,共9页
Chinese Journal of Applied and Environmental Biology
基金
国家重点研发计划项目(2017YFC0505003,2017YFC0503906)
国家自然科学基金项目(31901295,32071745,31870602)
四川省杰出青年科技人才计划项目(2020JDJQ0052)
四川省应用基础研究项目(2021YJ0340)
四川农业大学科研兴趣培养项目(2020227)资助。
关键词
彩叶林
土壤持水
水文生态
季节性冻融
亚高山森林
colored-leaf forest
soil water holding capacity
hydrological ecology
seasonal freeze-thaw
subalpine forest
