Soil Profile Temperature Variation in Farmlands During Freeze-thaw Period in Mollisol Region

Wang Yifei; Zheng Fenli; Zhou Xiujie; Qin Chao; Fu Han; Zuo Xiaofeng; Liu Gang; Zhang Jiaqiong

doi:10.13961/j.cnki.stbctb.2019.03.010

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Soil Profile Temperature Variation in Farmlands During Freeze-thaw Period in Mollisol Region

- Soil Profile Temperature Variation in Farmlands During Freeze-thaw Period in Mollisol Region
- Bulletin of Soiland Water Conservation Vol. 39, Issue 3, Pages: 57-64(2019)
- 作者机构：
  
  1. 西北农林科技大学水土保持研究所, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西杨凌,712100
  2. 中国科学院水利部水土保持研究所, 陕西杨凌,712100
  3. 黑龙江省气象数据中心,黑龙江,哈尔滨,150000
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2019.03.010
  CLC： S157.1
- Published：2019
- 稿件说明：
移动端阅览
Wang Yifei, Zheng Fenli, Zhou Xiujie, et al. Soil Profile Temperature Variation in Farmlands During Freeze-thaw Period in Mollisol Region[J]. Bulletin of Soiland Water Conservation, 2019, 39(3): 57-64.
DOI：

Wang Yifei, Zheng Fenli, Zhou Xiujie, et al. Soil Profile Temperature Variation in Farmlands During Freeze-thaw Period in Mollisol Region[J]. Bulletin of Soiland Water Conservation, 2019, 39(3): 57-64. DOI： 10.13961/j.cnki.stbctb.2019.03.010.

摘要

[目的]研究东北黑土区农地土壤温度变化特征，为冻融作用程度量化分析和冻融作用对土壤侵蚀影响提供基础数据。[方法]利用2015—2018年黑龙江省宾州河流域典型农地2 m土壤剖面11月至翌年4月土壤温度观测资料以及气温数据，分析了冻结和融化过程中土壤温度变化特征以及土壤温度对气温变化的响应，确定土壤冻结与融化过程中耕层土壤冻融循环次数。[结果]11月至翌年2月的冻结期，土壤温度随土层深度的增加而增加；3—4月份土壤温度梯度发生反向改变，当土壤完全消融后，土壤温度随着土层深度的增加而递减，土壤最大冻结深度为80 cm。研究结果还表明，0—60 cm土层的土壤温度均与气温呈极显著正相关，其相关性随土壤深度增加而减小；而80 cm以下土层，土壤温度均与气温呈负相关。[结论]研究区土壤冻结和融化过程分别呈单向冻结和双向融化现象，冻融循环主要发生在农地耕层0—20 cm土层，其年最大冻融循环次数分别为12次和7次，为设计黑土冻融循环模拟试验提供了数据支持。

Abstract

[Objective] This study explored the characteristics of soil temperature changes in farmlands of Mollisol region in Northeast China in order to provide basic data for quantifying the degree of freeze-thaw action and its impacts on soil erosion.[Methods] Based on the data of soil temperature in 2 m soil profile and air temperature from November to next April in 2015-2018 at the typical farmland in Binzhou River basin of Heilongjiang Province

we analyzed the characteristics of soil temperature variation and its responses to air temperature changes during freeze-thaw processes and freeze-thaw times in plough layer in farmlands.[Results] The soil temperature increased with the increase of soil depth from November to next February

while declined with the increase of soil depth when the soil was completely melted. The maximum frozen depth was 80 cm in farmlands of the research region. Meanwhile

there was a significant positive correlation between soil temperature in 0-60 cm depth and air temperature

and this correlation decreased with the increase of soil depth. In contrast

soil temperature under 80 cm depth was negatively correlated with air temperature.[Conclusion] There was a unidirectional freezing and bidirectional thawing in the study area. The freeze-thaw action mainly occurred at 0-20 cm in the topsoil layer of farmland

both maxinum freeze-thaw cycle times were 12 and 7

respectively

which provided the scientific basis for the design of simulated Mollisol freeze-thaw cycle experiments.

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