文章摘要
李杨波,刘楠,韩进斌,郭勇强,李变华,申彦科.冻融循环对五台山典型植被土壤微团聚体的影响[J].水土保持通报,2018,38(5):21~27
冻融循环对五台山典型植被土壤微团聚体的影响
Effects of Freeze-thaw Cycles on Soil Micro-aggregates in Typical Vegetations of Wutai Mountain
投稿时间:2018-03-12  修订日期:2018-04-13
DOI:10.13961/j.cnki.stbctb.2018.05.004
中文关键词: 冻融循环  林线  土壤微团聚体  分形  五台山
英文关键词: freeze-thaw cycles  timberline  soil micro-aggregates  fractal  Wutai Mountain
基金项目:国家自然科学基金项目“基于水文过程和冻融循环的高山植被土壤氮动态研究”(31400618);国家留学基金管理委员会资助(201708140203,留金法[2017]5087号);国家自然科学基金项目(41572239,41502243)
作者单位E-mail
李杨波 太原理工大学 水利科学与工程学院, 山西 太原 030024  
刘楠 太原理工大学 水利科学与工程学院, 山西 太原 030024 lntx617129@126.com 
韩进斌 山西省林业厅, 山西省五台山树木园, 山西 忻州 035500  
郭勇强 山西省林业厅, 山西省五台山树木园, 山西 忻州 035500  
李变华 山西省林业厅, 山西省五台山树木园, 山西 忻州 035500  
申彦科 中水北方勘测设计研究有限责任公司, 天津 300220  
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中文摘要:
      [目的]研究气候变化背景下季节性冻融对土壤微团聚体的作用,为影响林线附近土壤地球生物化学过程的相关研究提供参考。[方法]选择五台山林线附近3种典型植被:草甸、华北落叶松(Larix principis-rupprechtii)和云杉(Picea meyeri)覆盖下的土壤,通过土柱野外原位培养,测定不同时期土壤各粒径微团聚体含量以及土壤分形维数(D)。[结果]在培养期内,3个样地的2~0.25 mm和0.25~0.05 mm团聚体含量变化趋势各不相同; 0.05~0.02 mm (先降后增再降),0.02~0.002 mm (先降后增,华北落叶松样地除外),<0.002 mm (先增后降)团聚体含量变化趋势基本一致。在初冻期和融化期,季节性冻融导致3个样地土壤微团聚体含量发生显著变化(p<0.05),深冻期显著变化(p>0.05)。生长季同样发生了土壤微团聚体含量的显著变化(p<0.05)。不同样地植被组成的差别造成了土壤微团聚体含量差异显著(p<0.05),体现在初冻期和融化期。季节性冻融期间,土壤微团聚体分形维数逐渐增加,而此时云杉样地土壤微团聚体分形维数最低;生长季期间,微团聚体分形维数逐渐降低,草甸样地土壤微团聚体分形维数最低,但在生长季末期,则是华北落叶松样地最低;但3个样地土壤微团聚体分形维数仅在生长季末期存在显著差异(p<0.05),且培养期结束时的土壤分形维数与开始时显著差异(p>0.05)。[结论]季节性冻融对3个样地土壤微团聚体含量都具有显著影响,且3种植被下土壤结构对季节性冻融的响应也明显不同,主要发生在初冻期和融化期;在培养期内,虽在冻融作用下土壤微团聚体分形维数增加,但进入生长季后都逐渐减少至培养前水平,3个样地土壤结构性和团聚能力均呈周期性变化,具有一定的自我恢复能力。
英文摘要:
      [Objective] The effect of seasonal freeze-thaw on soil micro-aggregates in the context of climate change was studied in order to provide references for the reserch of soil biochemical processes near the timberline.[Methods] Soil samples from three typical vegetation types (meadow, Larix principis-rupprechtii and Picea meyeri) near the timberline of Wutai Mountain were collected for soil column in situ experiment. Soil micro-aggregates contents and fractal dimensions (D) were measured.[Results] The variations of 2~0.25 mm and 0.25~0.05 mm aggregate contents were different among the three plots. The content of 0.05~0.02 mm aggregate reduced initially, then increased and finally reduced. The content of 0.02~0.002 mm aggregate reduced initially and then increased (except in Larix principis-rupprechtii plot), and the content of <0.002 mm micro-aggregates increased firstly and then reduced. The content of micro-aggregates changed significantly (p<0.05) due to seasonal freeze-thaw events in initial freezing and thawing periods, while there was no significant change in deep freezing period (p>0.05). Soil micro-aggregate contents also changed significantly (p<0.05) in the growing season. Different vegetation compositions caused significant differences (p<0.05) among micro-aggregate contents in three plots, especially, in initial freezing and thawing periods. During the freezing-thawing period, D values were increased, and that of Picea meyeri plots was the lowest. In growing season, D values were decreased, and that of meadou plots was the lowest. Significant differences (p<0.05) of D values among three researched plots were only observed in the late growing season, and the least D value is obtained in H. principis-rupprechtii.[Conclusion] Freeze-thaw cycles have great impacts on soil micro-aggregate contents. The responses of soil structures to seasonal freeze-thaw events are significantly different, and mainly occur in initial freezing period and thawing period. The D values of all plots are increased by freeze-thaw cycles. Although the D value of soil microaggregates increased during the incubation period, it gradually decreased to the pre-incubation level after entering the growing season. Soil aggregations and structures of all three plots vary periodically and have certain self-recovery capabilities.
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