氮与生物炭相互作用促进了土壤呼吸温度敏感性的稳定

doi:10.1093/jpe/rtaf141

Journal of Plant Ecology

• •

氮与生物炭相互作用促进了土壤呼吸温度敏感性的稳定

收稿日期:2025-03-27 接受日期:2025-08-22

Nitrogen and biochar interactions promote the stabilization of the temperature sensitivity of soil respiration

Chen Hu^a,b, Jinyu Gong^a, Zhiyuan Ma^a, Linxuan He^a, Jingpin Lei^a,c*, Hongxia Cui^b,d*

^aResearch Institute of Forestry, Chinese Academy of Forestry, Key Laboratory of Forest Silviculture of the State Forestry and Grassland Administration, Beijing 100091, China
^bHubei Academy of Forestry, Wuhan 430000, China
^cCo-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China

^dHubei Shennongjia Forestry Ecosystem Research Station, Shennongjia 442421, China

^*Corresponding authors. E-mail: leijp@caf.ac.cn (J.L.); chxlky@163.com (H.C.)

Received:2025-03-27 Accepted:2025-08-22
Supported by:
This research was supported by the National Key R&D Program of China (2023YFD2200405) and the Science and Technology Research Project of Hubei Academy of Forestry (2021YGG05).

摘要/Abstract

摘要： 中国人工林面积位居世界首位，但氮(N)沉降加剧和气候变暖等共同威胁其土壤有机碳(SOC)库的稳定性。土壤呼吸(R_s)是SOC分解的主要途径，其调控机制仍未阐明。生物炭因其改良土壤养分和调节微生物群落的特性，被认为可缓解N沉降的负面影响。然而，N和生物炭交互作用如何通过土壤微生物群落结构、酶活性及碳氮磷循环过程来影响土壤呼吸的机制，以及土壤呼吸温度敏感性(Q₁₀)在二者作用下的响应规律仍不明确。本研究以日本落叶松(Larix kaempferi)人工林为研究对象，通过为期5年模拟N沉降和生物炭添加的控制实验，结合土壤碳循环相关性质的变化特征和互作关系，探究上述问题。结果表明：低N添加(LN: 50 kg N ha⁻¹ a⁻¹)使R_s增加了7%，高N添加(HN: 100 kg N ha⁻¹ a⁻¹)则使R_s降低了32%；低生物炭(C₅: 5 t ha⁻¹)和高生物炭(C₁₀: 10 t ha⁻¹)分别使R_s增加了8%和13%；N和生物炭交互处理均表现出抑制作用，使R_s降低了12%−20%。LN、C₅、C₁₀均增强了Q₁₀，HN则降低了该值。此外，N和生物炭的交互处理有利于维持Q₁₀的稳定。N和生物炭添加对土壤碳循环的影响机制呈多种路径：N添加通过提升AP、NO₃⁻-N含量直接或间接抑制微生物生物量及团聚体稳定性，而生物炭对SOC的潜在促进作用受限于其效应衰减，N和生物炭共同通过化学-微生物互作网络影响R_s。本研究阐明了N和生物炭添加下土壤微生物−理化−呼吸的级联响应机制，为在N沉降和潜在的温度升高情况下的土壤碳排放管理提供了参考。

关键词: 土壤呼吸, 温度敏感性, 微生物群落, 亚热带人工林, 生物炭改良

Abstract: Nitrogen (N) deposition and climate warming threaten plantation soil organic carbon (SOC) stability. Soil respiration (R_s), the primary pathway for SOC decomposition, remains poorly understood in terms of regulatory mechanisms. Biochar may mitigate N deposition impacts. However, the mechanisms by which the interactive effects of N and biochar influence R_s through soil microbial community structure, enzyme activity, and C-N-P cycling processes, as well as the temperature sensitivity (Q₁₀) of Rs under these interactions, remain unclear. This study investigated these issues through a five-year controlled experiment simulating N deposition and biochar addition in a Larix kaempferi plantation, integrating changes in soil C-cycle-related properties and their interactions. The results revealed that low N addition (LN: 50 kg N ha⁻¹ a⁻¹) increased R_s by 7%, while high N addition (HN: 100 kg N ha⁻¹ a⁻¹) reduced it by 32%. Low and high biochar treatments (C₅: 5 t ha⁻¹; C₁₀: 10 t ha⁻¹) increased R_s by 8% and 13%, respectively. N and biochar interactions consistently suppressed R_s, reducing it by 12%−20%. LN, C₅and C₁₀ enhanced Q_10, whereas HN decreased it. Additionally, N and biochar interactions stabilized Q₁₀. N addition directly or indirectly inhibited microbial biomass and aggregate stability by elevating available phosphorus and NO₃⁻-N content, while biochar’s potential to promote SOC was constrained by its diminishing effects over time. Both factors collectively influenced R_s through a chemical-microbial interaction network. This study elucidates the cascading mechanisms linking soil microbial-physicochemical-R_s under N and biochar additions, providing insights for managing soil C emissions under rising temperatures.

Key words: soil respiration, temperature sensitivity, microbial community, subtropical plantation, biochar amendment

. 氮与生物炭相互作用促进了土壤呼吸温度敏感性的稳定[J]. Journal of Plant Ecology, DOI: 10.1093/jpe/rtaf141.

Chen Hu, Jinyu Gong, Zhiyuan Ma, Linxuan He, Jingpin Lei, Hongxia Cui. Nitrogen and biochar interactions promote the stabilization of the temperature sensitivity of soil respiration[J]. J Plant Ecol, DOI: 10.1093/jpe/rtaf141.

[1]	. 土壤性质和微生物群落驱动不同坡位翠柏的异速生长模式[J]. Journal of Plant Ecology, 2025, 18(3): 1-17.
[2]	. 随机生态过程构建了三江源国家公园的土壤微生物群落[J]. Journal of Plant Ecology, 2025, 18(2): 1-17.
[3]	. 加拿大一枝黄花通过凋落物渗滤液和根分泌物改变土壤微生物群落和理化性质[J]. Journal of Plant Ecology, 2025, 18(2): 1-14.
[4]	. 陆生植物系统共生现象的普遍性及其潜在机制[J]. Journal of Plant Ecology, 2024, 17(6): 0-rtae051.
[5]	. 外源酶添加对人工林凋落物质量残留、养分含量和微生物群落的影响[J]. Journal of Plant Ecology, 2023, 16(6): 0-rtad031.
[6]	. 干旱胁迫下水稻根鞘微生物群落结构[J]. Journal of Plant Ecology, 2023, 16(5): 0-rtad012.
[7]	. 青藏高原土壤氮矿化速率及其温度敏感性的海拔差异[J]. Journal of Plant Ecology, 2023, 16(5): 0-.
[8]	. [J]. Journal of Plant Ecology, 2022, 15(4): 854-863.
[9]	. [J]. Journal of Plant Ecology, 2022, 15(2): 359-371.
[10]	. [J]. Journal of Plant Ecology, 2021, 14(2): 280-290.
[11]	. [J]. Journal of Plant Ecology, 2020, 13(1): 20-26.

氮与生物炭相互作用促进了土壤呼吸温度敏感性的稳定

Nitrogen and biochar interactions promote the stabilization of the temperature sensitivity of soil respiration

PDF (PC)

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 11

编辑推荐

Metrics

本文评价