Effects of Freeze-thaw Cycles on Soil Micro-aggregates in Typical Vegetations of Wutai Mountain

LI Yangbo; LIU Nan; HAN Jinbin; GUO Yongqiang; LI Bianhua; SHEN Yanke

doi:10.13961/j.cnki.stbctb.2018.05.004

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Effects of Freeze-thaw Cycles on Soil Micro-aggregates in Typical Vegetations of Wutai Mountain

- Effects of Freeze-thaw Cycles on Soil Micro-aggregates in Typical Vegetations of Wutai Mountain
- Bulletin of Soiland Water Conservation Vol. 38, Issue 5, Pages: 21-27(2018)
- 作者机构：
  
  1. 太原理工大学水利科学与工程学院,山西,太原,030024
  2. 山西省林业厅, 山西省五台山树木园,山西,忻州,035500
  3. 中水北方勘测设计研究有限责任公司,天津,300220
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2018.05.004
  CLC： S714;S718.5
- Published：2018
- 稿件说明：
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LI Yangbo, LIU Nan, HAN Jinbin, et al. Effects of Freeze-thaw Cycles on Soil Micro-aggregates in Typical Vegetations of Wutai Mountain[J]. Bulletin of Soiland Water Conservation, 2018, 38(5): 21-27.
DOI：

LI Yangbo, LIU Nan, HAN Jinbin, et al. Effects of Freeze-thaw Cycles on Soil Micro-aggregates in Typical Vegetations of Wutai Mountain[J]. Bulletin of Soiland Water Conservation, 2018, 38(5): 21-27. DOI： 10.13961/j.cnki.stbctb.2018.05.004.

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），深冻期无显著变化（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无显著差异（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。

Abstract

[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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