氮沉降下不同碳添加模式对亚热带毛竹林土壤激发效应的影响

doi:10.13287/j.1001-9332.202210.015

应用生态学报 ›› 2022, Vol. 33 ›› Issue (10): 2619-2627.doi: 10.13287/j.1001-9332.202210.015

• 陆地生态系统固碳与增汇专栏 • 上一篇下一篇

氮沉降下不同碳添加模式对亚热带毛竹林土壤激发效应的影响

徐敏^1,2, 刘苑苑^1,2, 元晓春^1,2,3, 曾泉鑫^1,2, 林惠瑛^1,2, 吴晓霞^1,2, 崔琚琰^1,2, 陈文伟⁴, 陈岳民^1,2*

¹福建师范大学湿润亚热带山地生态国家重点实验室培育基地, 福州 350007;
²福建师范大学地理科学学院, 福州 350007;
³武夷学院旅游学院, 福建武夷山 354300;
⁴福建戴云山国家级自然保护区管理局, 福建泉州 362500

收稿日期:2022-04-22 修回日期:2022-07-31 出版日期:2022-10-15 发布日期:2023-04-15
通讯作者: * E-mail: ymchen@fjnu.edu.cn
作者简介:徐敏, 女, 2000年生, 硕士研究生。主要从事全球变化背景下森林生态系统碳循环和土壤激发效应研究。E-mail: 571599790@qq.com
基金资助:
福建省自然科学基金项目(2020J01142,2020J01397)和安徽省自然科学基金项目(2108085QC105)

Effects of different carbon addition modes on the soil priming effect of a subtropical Phyllostachys edulis forest under nitrogen deposition

XU Min^1,2, LIU Yuan-yuan^1,2, YUAN Xiao-cun^1,2,3, ZENG Quan-xin^1,2, LIN Hui-ying^1,2, WU Xiao-xia^1,2, CUI Ju-yan^1,2, CHEN Wen-wei⁴, CHEN Yueh-min^1,2*

¹Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fujian Normal University, Fuzhou 350007, China;
²School of Geographical Science, Fujian Normal University, Fuzhou 350007, China;
³College of Tourism, Wuyi University, Wuyishan 354300, Fujian, China;
⁴Daiyun Mountain National Nature Reserve Administration Bureau, Quanzhou 362500, Fujian, China

Received:2022-04-22 Revised:2022-07-31 Online:2022-10-15 Published:2023-04-15

摘要/Abstract

摘要： 激发效应(PE)在调控陆地土壤碳(C)循环中发挥着重要作用,但在氮(N)沉降日益严重的亚热带森林生态系统中,不同C添加模式对PE的影响尚不清楚。本研究通过添加¹³C标记的葡萄糖,进行90 d的室内培养试验,探究不同施N水平下(0、20、80 kg N·hm^-2·a^-1)C添加模式(单次C添加、重复C添加)对土壤PE的影响。结果表明: 不同模式葡萄糖添加均显著增加了土壤有机C(SOC)矿化,产生了正PE,且单次的葡萄糖添加比重复添加引起的PE更大;随着施N水平的增加,PE显著减弱,表明N沉降抑制了毛竹林土壤激发。相关分析显示,累积PE与β-N-乙酰氨基葡萄糖苷酶(NAG)、过氧化物酶(PEO)活性呈显著负相关,与微生物生物量磷(MBP)、酸碱度(pH)呈显著正相关。综上,施N和C添加共同作用于土壤时,可以通过刺激亚热带森林中原生土壤有机质矿化而对土壤C储量产生强烈影响。本研究证明,单次C添加模式可能高估了外源易分解有机C对PE的影响,而忽略了N沉降对PE的影响,进而高估了森林SOC的矿化损失。

关键词: 激发效应, 氮沉降, 碳添加模式, 酶活性

Abstract: Priming effect (PE) plays an important role in regulating terrestrial soil carbon (C) cycling, but the impact of different C addition modes on the PE in subtropical forest ecosystems with increasing nitrogen (N) deposition is unclear. In this study, we investigated the effects of C addition patterns (single or repeated C addition) on soil PE by adding ¹³C-labeled glucose for 90 d in an incubation experiment with different levels of N application (0, 20, and 80 kg N·hm^-2·a^-1). The different patterns of glucose addition significantly increased soil organic C (SOC) mineralization and produced positive PE. Single glucose addition resulted in stronger PE than repeated addition. PE was significantly weakened with increasing N application levels, indicating that N deposition inhibited soil excitation in Phyllostachys edulis forests. The cumulative PE was significantly negatively correlated with β-N-acetylaminoglucosidase (NAG) and peroxidase (PEO) activities, and was significantly positively correlated with microbial biomass P (MBP) and potential of hydrogen (pH). Our findings indicated that, when acting together on soil, N application and C addition could strongly affect soil C stocks by stimulating the mineralization of native soil organic matter in subtropical forests. The findings further indicated that single C addition model might overestimate the effect of exogenous readily decomposable organic C on PE and ignore the effect of N deposition on PE, which in turn would overestimate the mineralization loss of forest SOC.

Key words: priming effect, nitrogen deposition, carbon addition mode, enzymatic activity

徐敏, 刘苑苑, 元晓春, 曾泉鑫, 林惠瑛, 吴晓霞, 崔琚琰, 陈文伟, 陈岳民. 氮沉降下不同碳添加模式对亚热带毛竹林土壤激发效应的影响[J]. 应用生态学报, 2022, 33(10): 2619-2627.

XU Min, LIU Yuan-yuan, YUAN Xiao-cun, ZENG Quan-xin, LIN Hui-ying, WU Xiao-xia, CUI Ju-yan, CHEN Wen-wei, CHEN Yueh-min. Effects of different carbon addition modes on the soil priming effect of a subtropical Phyllostachys edulis forest under nitrogen deposition[J]. Chinese Journal of Applied Ecology, 2022, 33(10): 2619-2627.

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氮沉降下不同碳添加模式对亚热带毛竹林土壤激发效应的影响

Effects of different carbon addition modes on the soil priming effect of a subtropical Phyllostachys edulis forest under nitrogen deposition

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