Soil Organic Carbon Mineralization Response to Sudden Temperature Change in the Typical Dry Land Distributed in the Purple Hilly Region

FAN Jingjing1; CI En1; 2; TANG Jiang1; DING Changhuan1; LIAN Maoshan1; WANG Zifang1; 2

doi:10.13870/j.cnki.stbcxb.2017.01.047

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Soil Organic Carbon Mineralization Response to Sudden Temperature Change in the Typical Dry Land Distributed in the Purple Hilly Region

更新时间：2025-03-12

- Soil Organic Carbon Mineralization Response to Sudden Temperature Change in the Typical Dry Land Distributed in the Purple Hilly Region
- Vol. 31, Issue 1, Pages: 286-290(2017)
- 作者机构：
  
  1. 西南大学资源环境学院,重庆,400715
  2. 重庆市三峡库区农业面源污染控制工程技术研究中心,重庆,400715
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2017.01.047
  CLC： S153.6
- Published：2017
- 稿件说明：
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FAN Jingjing1, CI En1, 2, et al. Soil Organic Carbon Mineralization Response to Sudden Temperature Change in the Typical Dry Land Distributed in the Purple Hilly Region[J]. 2017, 31(1): 286-290.
DOI：

FAN Jingjing1, CI En1, 2, et al. Soil Organic Carbon Mineralization Response to Sudden Temperature Change in the Typical Dry Land Distributed in the Purple Hilly Region[J]. 2017, 31(1): 286-290. DOI： 10.13870/j.cnki.stbcxb.2017.01.047.

摘要

以紫色土为供试土壤，采用室内培养的方法，设置恒温20 ℃（HW）、突发性降温（20 ℃→10 ℃）（BW1）和突发性升温（20 ℃→30 ℃）（BW2）3个温度处理，研究了突发性变温下紫色丘陵区典型旱地土壤（紫色土）的有机碳矿化特征。其中温度突变的具体设置为：待20 ℃恒温培养至土壤有机碳矿化（Soil organic carbon

SOC）速率基本平稳且维持在较低水平时（第29天后），将培养温度分别突降至10 ℃和突升至30 ℃，继续培养47 d。结果表明，突发性变温对紫色土SOC矿化有显著影响（P＜0.05），在变温当天（第30天），突发性升温（BW2）处理对紫色土SOC矿化有明显促进作用，而突发性降温（BW1）处理则会明显削弱紫色土SOC矿化，二者的SOC矿化率分别较恒温（HW）处理提高了225.1%，降低了38.5%；变温后的培养初期（第30～44天），各温度处理间的SOC累积矿化量存在显著差异（P＜0.05），与HW处理相比，BW2和BW1处理中紫色土SOC累积矿化量的变幅分别为＋140.5%（升高）和－55.3%（降低）；随培养时间的延续，各处理间的SOC累积矿化量未发现明显差异。表明突发性变温对紫色土SOC矿化的影响具有一定的时限性，其影响时长在2周左右。结合矿化动力学分析可知，同恒温相比，突发性变温主要通过改变土壤易分解有机碳库（C0）大小进而影响紫色土SOC矿化。

Abstract

The purple soil was used as the test soil. An incubation experiment in the laboratory was conducted to explore the effects of sudden temperature change on soil organic carbon mineralization of the typical dry land soil (purple soil) sampled from the purple hilly region. Experiment consisted of three treatments

that was

treatment HW (constant temperature 20 ℃)

treatment BW1 (a sudden cooling from 20 ℃ to 10 ℃) and treatment BW2 (a sudden warming from 20 ℃ to 30 ℃). In treatment BW1 and treatment BW2

the sudden temperature change both happened when soil organic carbon (SOC) mineralization rate was basically stable and maintained a relatively lower level at the temperature of 20 ℃(29th day). After the sudden temperature change

treatment BW1

treatment BW2 and treatment HW was cultivated for another 47d. The results showed that sudden temperature change had a notable effect on purple soil SOC mineralization (P <0.05). More specifically

treatment BW2 had significantly promoted soil SOC mineralization

however

treatment BW1 dramatically impaired that. Compared with the constant temperature (HW) treatment

the SOC mineralization rates of the two increased by 225.1% and decreased by 38.5%. There was a significant difference in the amount of SOC accumulated mineralization between each temperature treatment (P<0.05) within initial stage after sudden temperature change (30th ~44th d). And compared to accumulated soil SOC mineralization in treatment HW

that in treatment BW2 and treatment BW1 increased by 40.5% and decreased by 55.3% respectively. But with the extension of the culture time

the amount of SOC accumulation in each treatment did not find a significant difference. Indicated that the effect of sudden temperature change on purple soil SOC mineralization was time-bounded

which remained around two weeks. Combined with mineralization kinetic data

the results showed that sudden temperature change affected SOC mineralization by changing the labile SOC pool size.

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