Influence of Pulsed Precipitation and Litter on the Priming Effects of Soil Carbon Mineralization in Temperate Steppe

doi:10.11733/j.issn.1007-0435.2024.03.024

Acta Agrestia Sinica ›› 2024, Vol. 32 ›› Issue (3): 879-888.DOI: 10.11733/j.issn.1007-0435.2024.03.024

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Influence of Pulsed Precipitation and Litter on the Priming Effects of Soil Carbon Mineralization in Temperate Steppe

ZHOU Zhi-yun^1,2,3,4,5, WANG Yi-jun^1,2,4, YANG Yan-li^1,2,3,4,5, DU Yan-gong^1,2, CHEN Ke-long^1,2,3,4,5

1. College of Geographical Sciences, Qinghai Normal University, Xining, Qinghai Province 810008, China;
2. Qinghai Province Key Laboratory of Physical Geography and Environmental Processes, Xining, Qinghai Province 810008, China;
3. Key Laboratory of Ministry of Education for Surface Processes and Ecological Conservation of the Qinghai-Tibet Plateau, Qinghai Normal University, Xining, Qinghai Province 810008, China;
4. Institute of Plateau Science and Sustainable Development, Xining, Qinghai Province 810008, China;
5. National Station of Locating Observation and Research for Wetland Ecosystem in Qinghai Lake, Haibei, Qinghai Province 812200, China

Received:2023-09-11 Revised:2023-11-20 Online:2024-03-15 Published:2024-04-03

脉冲降水和凋落物对温性草原土壤碳矿化激发效应的影响

周祉蕴^1,2,3,4,5, 王奕钧^1,2,4, 杨艳丽^1,2,3,4,5, 杜岩功^1,2, 陈克龙^1,2,3,4,5

1. 青海师范大学地理科学学院, 青海西宁 810008;
2. 青海省自然地理与环境过程重点实验室, 青海西宁 810008;
3. 青海师范大学青藏高原地表过程与生态保育教育部重点实验室, 青海西宁 810008;
4. 高原科学与可持续发展研究院, 青海西宁 810008;
5. 青海青海湖湿地生态系统国家定位观测研究站, 青海海北 812200

通讯作者: 陈克龙,E-mail:ckl7813@163.com
作者简介:周祉蕴(1999-)，女，汉族，四川德阳人，硕士研究生，主要从事湿地草地学研究，E-mail:824465275@qq.com
基金资助:
国家自然科学基金项目(41661023)；青海省创新平台建设专项青海省自然地理与环境过程重点实验室项目(2020-ZJ-Y06)；第二次青藏高原综合科学考察研究项目(2019QZKK0405)；水位上升下青海湖湖滨带生态系统变化及其对碳循环影响研究项目(2023-ZJ-905T)资助

Abstract

Abstract: Both pulsed precipitation and litter addition significantly affected the rate of soil organic carbon mineralization,but the response of organic carbon mineralization and its priming effects in temperate steppe to it is not clear. We established an indoor incubation test for 14 days,using the temperate steppe of Qinghai Lake Basin,with varying frequencies of pulsed precipitation (0~2 times),litter addition,and a control treatment to study the effects of pulsed precipitation (P),litter addition (L) and the interaction between the two (L+P) on the mineralization of soil organic carbon and its priming effects. The results showed that all three treatments significantly promoted the rate of mineralization and cumulative carbon mineralization,with the order increase being L+P>P>L>CK. Both L and L+P treatments produced highly significant positive priming effects with L+P>L. All three treatments increased the MBC and lowered the Electric conductivity,and the rate of carbon mineralization was significantly positively correlated with pH and NO^-₃-,and negatively correlated with MBC and MBN in L and L+P treatments,and negatively correlated with MBC and MBN in P treatment,and negatively correlated with MBC,NO^-₃-,and MBC. The P treatment was significantly negatively correlated with MBC and NO^-₃- and positively correlated with pH and NH⁺₄-N. In summary,pulsed precipitation and litter addition and their interactions significantly promoted the rate and priming effects of soil carbon mineralization in the temperate steppe of Qinghai Lake basin and enhanced the strength of its carbon source.

Key words: Pulse effect, Litter addition, Soil carbon mineralization, Priming effects, Qinghai Lake

摘要： 脉冲式降水和凋落物输入均会显著影响土壤有机碳矿化速率,但温性草原有机碳矿化及其激发效应对其的响应尚不明确。以青海湖流域温性草原为研究对象,设置脉冲式降水频次(0~2次)、凋落物添加和对照处理,通过14 d室内培养试验,开展脉冲式降水(P)、凋落物添加(L)及两者交互作用(L+P)对土壤有机碳矿化及其激发效应影响研究。结果表明:3种处理均显著促进矿化速率和累计碳矿化量,增幅为L+P>P>L>CK。L及L+P处理均产生极显著正激发效应,且L+P>L。3种处理均提高了MBC,降低了电导率。L和L+P处理下碳矿化速率与pH值、NO^-₃-N显著正相关,与MBC,MBN呈负相关关系,P处理与MBC,NO^-₃-N显著负相关,与pH值、NH⁺₄-N呈正相关关系。综上所述,脉冲式降水和凋落物添加及其交互作用显著促进青海湖流域温性草原土壤碳矿化速率和激发效应,增强其碳源强度。

关键词: 脉冲效应, 凋落物添加, 土壤碳矿化, 激发效应, 青海湖

CLC Number:

S154.1

ZHOU Zhi-yun, WANG Yi-jun, YANG Yan-li, DU Yan-gong, CHEN Ke-long. Influence of Pulsed Precipitation and Litter on the Priming Effects of Soil Carbon Mineralization in Temperate Steppe[J]. Acta Agrestia Sinica, 2024, 32(3): 879-888.

周祉蕴, 王奕钧, 杨艳丽, 杜岩功, 陈克龙. 脉冲降水和凋落物对温性草原土壤碳矿化激发效应的影响[J]. 草地学报, 2024, 32(3): 879-888.

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Influence of Pulsed Precipitation and Litter on the Priming Effects of Soil Carbon Mineralization in Temperate Steppe

脉冲降水和凋落物对温性草原土壤碳矿化激发效应的影响

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