黄土丘陵区降水变化下草地土壤微生物残体碳对土壤有机碳组分的贡献及其影响因素

doi:10.13287/j.1001-9332.202409.011

应用生态学报 ›› 2024, Vol. 35 ›› Issue (9): 2592-2598.doi: 10.13287/j.1001-9332.202409.011

黄土丘陵区降水变化下草地土壤微生物残体碳对土壤有机碳组分的贡献及其影响因素

周玥¹, 李娅芸², 李娜³, 李会军⁴, 张羽涵³, 安韶山^3,4,5*, 王宝荣⁶

¹西北农林科技大学资源环境学院, 陕西杨凌 712100;
²黄河水资源保护科学研究院, 郑州 450004;
³西北农林科技大学水土保持科学与工程学院, 陕西杨凌 712100;
⁴中国科学院水利部水土保持研究所, 陕西杨凌 712100;
⁵西北农林科技大学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;
⁶西北农林科技大学草业与草原学院, 陕西杨凌 712100

收稿日期:2023-10-01 接受日期:2024-07-09 出版日期:2024-09-18 发布日期:2025-03-18
通讯作者: * E-mail: shan@ms.iswc.ac.cn
作者简介:周玥, 女, 1999年生, 硕士研究生。主要从事黄土高原草地土壤碳固定研究。E-mail: yue.zhou@nwafu.edu.cn
基金资助:
国家自然科学基金面上项目(42077072)、国家自然科学基金青年项目(42307440)、陕西省博士后特别资助项目(2023BSHTBZZ27)和国家资助博士后研究人员计划(GZC20232153)

Contribution of soil microbial necromass carbon to soil organic carbon in grassland under precipitation change and its influencing factors in loess hilly region, Northwest China

ZHOU Yue¹, LI Yayun², LI Na³, LI Huijun⁴, ZHANG Yuhan³, AN Shaoshan^3,4,5*, WANG Baorong⁶

¹College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China;
²Institute of Yellow River Water Resources Protection, Zhengzhou 450004, China;
³College of Soil and Water Conservation Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China;
⁴Institute of Soil and Water Conversation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, Shaanxi, China;
⁵State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Yangling 712100, Shaanxi, China;
⁶College of Grassland Agriculture, Northwest A&F University, Yangling 712100, Shaanxi, China

Received:2023-10-01 Accepted:2024-07-09 Online:2024-09-18 Published:2025-03-18

摘要/Abstract

摘要： 为探究降水变化下草地土壤中微生物残体碳(MNC)对土壤有机碳组分的贡献及其影响因素,在黄土丘陵区白羊草植被恢复地,设置7个降水水平,以自然降水(CK)量作为对照,增加和降低20%、40%、60%的自然降水量(I₂₀、I₄₀、I₆₀、D₂₀、D₄₀、D₆₀)开展试验,分析了土壤有机碳组分中真菌残体碳(FNC)、细菌残体碳(BNC)和MNC的含量及变化特征。结果表明:1)土壤矿物结合态有机碳(MAOC)中的MNC含量(1.62～2.17 g·kg^-1)要高于颗粒态有机碳(POC)中的MNC含量(0.69～1.31 g·kg^-1),前者是后者的1.4～2.8倍。2)在MAOC和POC中,FNC和MNC变化规律相似。MAOC中的BNC是FNC的1～3.1倍;POC中的FNC要高于BNC,只在I₄₀和I₆₀时BNC大于FNC。3)整体上,降水增加和减少均提高了MNC/MAOC和BNC/MAOC,降低了MNC/POC和FNC/POC。I₆₀和D₆₀时的MNC/MAOC比CK高33.2%和18.1%;D₆₀、I₄₀和I₆₀时的BNC/MAOC比CK高28.0%、23.0%和19.1%。除D₆₀外,其他降水条件下FNC/POC、MNC/POC显著低于CK;在POC中,D₄₀、D₂₀、I₂₀、I₄₀和I₆₀的MNC/POC比CK低28.4%、23.3%、28.8%、23.3%和32.2%,D₄₀、D₂₀、I₂₀、I₄₀和I₆₀的FNC/POC比CK低23.3%、16.1%、21.0%、27.0%和31.0%。4)NH₄⁺-N和pH是降水变化下影响不同碳组分中MNC含量的主要因素。综上,降水变化(增加或降低)提高了以BNC为主的MNC对MAOC的贡献,降低了以FNC为主的MNC对POC的贡献,本研究对了解降水变化下微生物残体在不同有机碳组分中的分配规律具有重要意义。

关键词: 降水变化, 微生物残体碳, 矿物结合态有机碳, 颗粒态有机碳

Abstract: To investigate the contribution of microbial necromass carbon (MNC) to soil organic carbon (SOC) and its influencing factors under precipitation changes in grassland, we conducted a precipitation experiment with seven different precipitation levels in the Bothriochloa ischaemum restoration area in the loess hilly region. We analyzed the contents and characteristics of fungal necromass carbon (FNC), bacterial necromass carbon (BNC), and MNC in different fractions of SOC under different treatments, including natural precipitation (CK), and increased and decreased 20%, 40%, 60% of natural precipitation (I₂₀, I₄₀, I₆₀, D₂₀, D₄₀, D₆₀) . The results showed that 1) MNC content in mineral organic carbon (MAOC) ranged from 1.62 g·kg^-1 to 2.17 g·kg^-1, which was higher than that in particulate organic carbon (POC) ranging from 0.69 g·kg^-1 to 1.31 g·kg^-1. The former was approximately 1.4 to 2.8 times as that of the latter. 2) FNC and MNC exhibited similar changes in both MAOC and POC fractions. BNC content in MAOC was approximately 1-3.1 times as that of FNC. FNC content in POC was generally higher than BNC except for I₄₀ and I₆₀ where BNC exceeded FNC. 3) Overall, both increases and decreases in precipitation resulted in elevated MNC/MAOC and BNC/MAOC ratios, but decreased MNC/POC and FNC/POC ratios. The MNC/MAOC ratios in I₆₀ and D₆₀ were 33.2% and 18.1% higher than CK, respectively. The BNC/MAOC ratios in D₆₀, I₄₀ and I₆₀ were 28.0%, 23.0% and 19.1% higher than those in CK, respectively. Except for D₆₀, the FNC/POC and MNC/POC ratios were significantly lower than CK under other treatments. In terms of POC fractions, the MNC/POC ratios of D₄₀, D₂₀, I₂₀, I₄₀ and I₆₀ were 28.4%, 23.3%, 28.8%, 23.3% and 32.2% lower than that of CK, respectively. The FNC/POC ratio of D₄₀, D₂₀, I₂₀, I₄₀ and I₆₀ was found to be lower by 23.3%, 16.1%, 21.0%, 27.0% and 31.0% compared to that of CK, respectively. 4) NH₄⁺-N and pH were the primary factors influencing the content of MNC in different carbon fractions under varying precipitation conditions. In summary, alterations in precipitation (either increase or decrease) enhanced the contribution of BNC-dominated MNC to MAOC, but reduced the contribution of FNC-dominated MNC to POC. This study was of significance for understanding the distribution of microbial necromass across different organic carbon fractions under precipitation alterations.

Key words: precipitation change, microbial necromass carbon, mineral-associated organic carbon, particulate organic carbon

周玥, 李娅芸, 李娜, 李会军, 张羽涵, 安韶山, 王宝荣. 黄土丘陵区降水变化下草地土壤微生物残体碳对土壤有机碳组分的贡献及其影响因素[J]. 应用生态学报, 2024, 35(9): 2592-2598.

ZHOU Yue, LI Yayun, LI Na, LI Huijun, ZHANG Yuhan, AN Shaoshan, WANG Baorong. Contribution of soil microbial necromass carbon to soil organic carbon in grassland under precipitation change and its influencing factors in loess hilly region, Northwest China[J]. Chinese Journal of Applied Ecology, 2024, 35(9): 2592-2598.

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黄土丘陵区降水变化下草地土壤微生物残体碳对土壤有机碳组分的贡献及其影响因素

Contribution of soil microbial necromass carbon to soil organic carbon in grassland under precipitation change and its influencing factors in loess hilly region, Northwest China

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