摘要
以五台山林线附近3种典型植被(亚高山草甸CD、华北落叶松林HL和云杉×华北落叶松混交林YH)土壤为研究对象,采用土柱野外原位培养法,通过对各时期土壤水稳性大团聚体含量、平均重量直径(MWD)和几何平均直径(GMD)的测定与分析,研究季节性冻融对土壤水稳性大团聚体的影响。结果表明:培养期内,3种植被土壤5~10mm和2~5mm水稳性团聚体含量与其余粒级呈现相反的波动变化趋势。深冻期,CD土壤5~10mm水稳性团聚体含量显著减小(p<0.05),MWD显著减小(p<0.05);YH土壤2~5mm水稳性团聚体含量显著增加(p<0.05),GMD显著增加(p<0.05)。融化期,HL土壤2~5mm和1~2mm水稳性团聚体含量显著增加(p<0.05),MWD和GMD显著增加(p<0.05)。不同植被覆盖下土壤水稳性大团聚体含量的差异主要体现在CD土壤水稳性大团聚体含量与HL、YH差异显著(p<0.05)。因此,季节性冻融对3种植被土壤水稳性大团聚体都具有显著影响,而且3种植被覆盖下土壤团聚体水稳定性对季节性冻融的响应也明显不同,主要发生在深冻期和融化期。经历了季节性冻融后,CD土壤团聚体水稳定性降低,HL和YH土壤团聚体水稳定性增强。
Soil samples from three typical vegetations(subalpine meadow CD,Larix principis-rupprechtii HL,and Picea meyeri×Larix principis-rupprechtii mixed forest YH)near the timberline of Wutai mountain were collected for soil column in situ experiment.Soil water-stable macroaggregates,mean weight diameter(MWD)and geometric mean diameter(GMD)in each period were analyzed in order to probe the effects of seasonal freeze-thaw cycle on the soil water-stable macroaggregates.The results showed that the soil water-stable aggregate amounts of 5~10 mm and 2~5 mm in the three vegetations showed opposite fluctuation trend with the rest of grain size during the incubation period.During the deep-freezing period,the amounts of 5~10 mm water-stable aggregates and MWD in CD decreased significantly(p<0.05);the amounts of 2~5 mm water-stable aggregates and GMD in YH increased significantly(p<0.05).During the thawing period,the amounts of 2~5 mm and 1~2 mm water-stable aggregates,MWD and GMD in HL increased significantly(p<0.05).Soil water-stable macroaggregate amounts of CD was significantly different from that of HL and YH(p<0.05).Thus,seasonal freeze-thaw had significant effects on the amounts of soil water-stable macroaggregates.The responses of water-stability of soil aggregates to seasonal freeze-thaw were significantly different,mainly occurred in deep freezing period and thawing period.After seasonal freeze-thaw,the water-stability of soil aggregates decreased in CD,while the water-stability of soil aggregates enhanced in HL and YH.
作者
李嘉
刘楠
韩进斌
赵建儒
刘敏
LI Jia;LIU Nan;HAN Jinbin;ZHAO Jianru;LIU Min(College of Water Resources Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Wutai Mountain Arboretum,Shanxi Provincial Forestry and Grassland Administration,Xinzhou 035500,China;CPECC Southwest Electric Power Design Institute,Chengdu 610021,China)
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2020年第5期140-146,共7页
Journal of Arid Land Resources and Environment
基金
国家自然科学基金(31400618)
国家留学基金管理委员会资助(201708140203,留金法[2017]5087号)
国家自然科学基金委员会(41572239,41502243)资助.
作者简介
李嘉(1994-),男,汉族,山西怀仁人,硕士,主要从事水土保持方面的研究。E-mail:lj940322@126.com;通讯作者:刘楠(1983-),男,汉族,河北石家庄人,讲师,博士,主要从事水土保持、生态水文研究。E-mail:lntx617129@126.com
