长期耕作对黑土有机碳储量及其组分的影响

doi:10.13287/j.1001-9332.202408.012

应用生态学报 ›› 2024, Vol. 35 ›› Issue (8): 2167-2175.doi: 10.13287/j.1001-9332.202408.012

长期耕作对黑土有机碳储量及其组分的影响

田圣陶^1,2, 罗洋², 隋鹏祥², 王浩², 任英², 周思琪^1,2, 刘海峰¹, 郑金玉^1,2*

¹延边大学农学院, 吉林延边 133002;
²吉林省农业科学院(中国农业科技东北创新中心)农业资源与环境研究所/农业部东北生理生态与耕作重点实验室, 长春 130033

收稿日期:2024-03-08 接受日期:2024-07-01 出版日期:2024-08-18 发布日期:2025-02-18
通讯作者: *E-mail: 15844052867@163.com
作者简介:田圣陶, 女, 1999年生, 硕士研究生。主要从事旱地耕层调控技术研究。E-mail: 18243397351@163.com
基金资助:
吉林科技发展计划项目(20230202023NC, 20230302005NC)、吉林省创新工程项目(KYJF2023DX017)和国家重点研发计划项目子课题(2022YFD1500104-03)

Impact of long-term tillage on the soil organic carbon storage and its composition in black soil

TIAN Shengtao^1,2, LUO Yang², SUI Pengxiang², WANG Hao², REN Ying², ZHOU Siqi^1,2, LIU Haifeng¹, ZHENG Jinyu^1,2*

¹Agricultural College, Yanbian University, Yanbian 133002, Jilin, China;
²Institute of Agricultural Resources and Environment, Jilin Academy of Agricultural Sciences (Northeast Agricultural Research Center of China)/Northeast Key Laboratory of Crop Physiology, Ecology and Cultivation, Ministry of Agriculture and Rural Affairs, Changchun 130033, China

Received:2024-03-08 Accepted:2024-07-01 Online:2024-08-18 Published:2025-02-18

摘要/Abstract

摘要： 土壤有机碳(SOC)对维持土壤肥力和农业可持续发展具有重要作用。为探究长期耕作对黑土区旱作农田土壤有机碳储量(SOCS)及其组分的影响,本研究基于39年的耕作试验,比较了不同耕作方式(旋耕起垄、免耕、深松、翻耕)对0～40 cm土层SOCS、活性有机碳组分和微生物残体碳(MNC)含量的影响。结果表明:与旋耕起垄相比,免耕处理显著增加了0～20 cm土层SOCS、SOC、可溶性有机碳(DOC)、微生物生物量碳(MBC)、易氧化有机碳(EOC)和MNC含量;深松和翻耕处理在0～20和20～40 cm土层中显著增加了SOCS、SOC和EOC含量,并在20～40 cm土层增加了MBC含量。此外,翻耕处理20～40 cm土层中DOC、颗粒有机碳和MNC含量显著高于其他处理。深松和翻耕处理相较于旋耕起垄和免耕处理,显著降低了0～20和20～40 cm土层中MNC对SOC的贡献率。结构方程模型表明,通过提升土壤团聚体平均重量直径、田间持水量和全磷含量,增强β-葡萄糖苷酶、淀粉酶和木质素过氧化物酶活性,能促进MNC的积累。深翻促进了0～40 cm土层SOC、活性有机碳和MNC的均匀分布,更有利于黑土区农田SOC的固定。

关键词: 保护性耕作, 活性有机碳组分, 土壤氨基糖, 微生物残体碳, 酶活性

Abstract: Soil organic carbon (SOC) is essential for maintaining soil fertility and promoting sustainable agricultu-ral development. We investigated the impact of long-term tillage practices on soil organic carbon storage (SOCS) and its components in dryland farming areas of the black soil region, based on a 39-year tillage practice experiment. We compared the effects of different tillage practices (conventional rotary and ridge tillage, CT; no-tillage, NT; subsoiling tillage, ST; moldboard plowing, MP) on SOCS, active organic carbon components, and microbial necromass carbon (MNC) content in the 0-40 cm soil layer. The results showed that, compared to CT, NT significantly increased the contents of SOCS, SOC, dissolved organic carbon (DOC), microbial biomass carbon (MBC), easily oxidizable organic carbon (EOC), and MNC in the 0-20 cm soil layer. Both ST and MP significantly improved the contents of SOCS, SOC, and EOC in 0-20 and 20-40 cm soil layers compared to CT and increased MBC content in the 20-40 cm soil layer. Additionally, MP treatment significantly improved the contents of DOC, particulate organic carbon, and MNC in the 20-40 cm soil layer compared to other treatments. ST and MP significantly reduced the contribution rate of MNC to SOC in both soil layers compared to CT and NT treatments. Results of structural equation modeling showed that enhancing the mean weight diameter of soil aggregates, field capacity, and total phosphorus content, along with increasing the activities of β-glucosidase, amylase, and lignin peroxidase, could promote MNC accumulation. MP treatment facilitated the uniform distribution of SOC, active organic carbon, and MNC in the 0-40 cm soil layer, which was more conducive to the fixation of SOC in farmland in the black soil region.

Key words: conservation tillage, labile organic carbon fraction, soil amino sugar, microbial necromass carbon, enzyme activity

田圣陶, 罗洋, 隋鹏祥, 王浩, 任英, 周思琪, 刘海峰, 郑金玉. 长期耕作对黑土有机碳储量及其组分的影响[J]. 应用生态学报, 2024, 35(8): 2167-2175.

TIAN Shengtao, LUO Yang, SUI Pengxiang, WANG Hao, REN Ying, ZHOU Siqi, LIU Haifeng, ZHENG Jinyu. Impact of long-term tillage on the soil organic carbon storage and its composition in black soil[J]. Chinese Journal of Applied Ecology, 2024, 35(8): 2167-2175.

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长期耕作对黑土有机碳储量及其组分的影响

Impact of long-term tillage on the soil organic carbon storage and its composition in black soil

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