不同含水量及冻结温度对黑土冻融循环过程有机碳矿化的影响

张博; 刘会敏; 毕鑫宇; 高航; 宋媛; 胡亚鲜; 栗现文

doi:10.13870/j.cnki.stbcxb.2024.04.006

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不同含水量及冻结温度对黑土冻融循环过程有机碳矿化的影响

更新时间：2025-03-12

- 不同含水量及冻结温度对黑土冻融循环过程有机碳矿化的影响
- Effects of Different Moisture Content and Freezing Temperature on Organic Carbon Mineralization During Freeze-Thaw Cycles in Black Soil
- 水土保持学报 2024年38卷第4期页码：55-62
- 作者机构：
  
  1. 西北农林科技大学水利与建筑工程学院, 陕西杨凌,712100
  2. 西北农林科技大学旱区农业水土工程教育部重点实验室, 陕西杨凌,712100
  3. 西北农林科技大学水土保持科学与工程学院, 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
- 作者简介：
  
  [ "张博(1999—),男,硕士生研究生,主要从事土壤有机碳矿化研究。E-mail:zhangbomg@nwafu.edu.cn" ]
- 基金信息：
  
  国家自然科学基金项目(52279049);中国博士后科学基金项目(2020M673518)
- DOI：10.13870/j.cnki.stbcxb.2024.04.006
  中图分类号： S153.6
- 纸质出版：2024
- 稿件说明：
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张博, 刘会敏, 毕鑫宇, 等. 不同含水量及冻结温度对黑土冻融循环过程有机碳矿化的影响[J]. 水土保持学报, 2024,38(4):55-62.

ZHANG Bo, LIU Huimin, BI Xinyu, et al. Effects of Different Moisture Content and Freezing Temperature on Organic Carbon Mineralization During Freeze-Thaw Cycles in Black Soil[J]. 2024, 38(4): 55-62.
张博, 刘会敏, 毕鑫宇, 等. 不同含水量及冻结温度对黑土冻融循环过程有机碳矿化的影响[J]. 水土保持学报, 2024,38(4):55-62. DOI： 10.13870/j.cnki.stbcxb.2024.04.006.

ZHANG Bo, LIU Huimin, BI Xinyu, et al. Effects of Different Moisture Content and Freezing Temperature on Organic Carbon Mineralization During Freeze-Thaw Cycles in Black Soil[J]. 2024, 38(4): 55-62. DOI： 10.13870/j.cnki.stbcxb.2024.04.006.

摘要

[目的] 冻融过程土壤呼吸在年土壤呼吸总量中占有重要比例

研究探讨土壤冻融过程中含水量、冻结温度和冻融循环次数对土壤碳矿化动态的影响。[方法] 以黑龙江省嫩江县鹤山农场九三水土实验站黑土为研究对象

开展室内冻融程度模拟试验

进行7次冻融循环

设置100%田间持水量(100%WHC)、60%田间持水量(60%WHC)和30%田间持水量(30%WHC)3种土壤含水量;10 ℃恒温处理(对照)、-5 ℃冻结处理(轻度冻结)和-15 ℃冻结处理(重度冻结)3种环境温度。[结果] 冻融循环次数、含水量和冻结温度对CO2排放量有显著影响

影响度分别为-0.63

0.21

0.14。解冻过程显著增加土壤碳矿化量;轻度冻结时

前3次冻融循环60%WHC土壤碳矿化量比100%WHC和30%WHC分别提高33.0%

35.2%

后4次冻融循环差异不明显;重度冻结时

前2次冻融循环100%WHC土壤碳矿化量

比60%WHC和30%WHC土壤分别提高25.2%

68.0%

后5次冻融循环差异不明显。[结论] 冻融循环次数对土壤CO2排放量影响最大

含水量次之

冻结温度最小。冻融作用增加低含水量土壤的CO2累积排放量;降低高含水量土壤的CO2累积排放量;而对中等含水量土壤

轻度冻结增加CO2累积排放量

重度冻结降低CO2累积排放量。一级动力学方程对冻融土壤CO2排放量的拟合效果较好(R2>0.997)

含水量和冻结温度对有机碳矿化潜力C0值有显著影响。

Abstract

[Objective] Soil respiration occupies an important proportion in the annual total soil respiration during freeze-thaw process. The effects of water content

freezing temperature and freeze-thaw cycles on soil carbon mineralization dynamics during soil freeze-thaw process were studied. [Methods] The study focuses on chernozem soil from the Nenjiang County Heshan Farm Jiusan Soil and Water Experimental Station in Heilongjiang Province

China was used as the research object to carry out an indoor freeze-thaw degree simulation test. Seven freeze-thaw cycles were carried out

and three soil moisture content were set 100% field water holding capacity (100% WHC)

60% field water holding capacity (60% WHC)

and 30% field water holding capacity (30% WHC). Additionally

three environmental temperatures were used a constant 10 °C (control)

-5 °C (mild freezing) and -15 °C (severe freezing). [Results] The number of freeze-thaw cycles

moisture content and freezing temperature had significant effects on CO2 emissions and the impact degrees were -0.63

0.21 and 0.14

respectively. The thawing process notably increased soil carbon mineralization. The soil carbon mineralization of 60% WHC in the first three freeze-thaw cycles increased 33.0% and 35.2%

respectively

compared with 100% WHC and 30% WHC in the last 4 freeze-thaw cycles. In the case of severe freezing

the carbon mineralization of 100% WHC soil in the first 2 freeze-thaw cycles increased by 25.2% and 68.0% respectively

compared with 60% WHC and 30% WHC soil in the last 5 freeze-thaw cycles. [Conclusion] The number of freeze-thaw cycles had the greatest effect on soil CO2 emission

followed by moisture content

and the least freezing temperature. The freeze-thaw effect increased the cumulative CO2 emissions of soil with low water content. The cumulative CO2 emission of soil with high water content was reduced. For soils with medium moisture content

mild freezing increased CO2 cumulative emissions

while severe freezing decreased them. The first-order kinetic equation fitted the CO2 emissions from freeze-thaw soil well (R2 > 0.997)

both moisture content and freezing temperature significantly influenced the potential for organic carbon mineralization (C0 value).

关键词

Keywords

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