酸雨和根系去除对杉木和火力楠人工林土壤有机碳的影响

doi:10.13287/j.1001-9332.202304.016

应用生态学报 ›› 2023, Vol. 34 ›› Issue (4): 937-945.doi: 10.13287/j.1001-9332.202304.016

酸雨和根系去除对杉木和火力楠人工林土壤有机碳的影响

王娇^1,2, 关欣^1,3, 黄苛^1,3, 段萱⁴, 陈波翰^1,2, 张伟东^1,3, 杨庆朋^1,3*

¹中国科学院沈阳应用生态研究所, 中国科学院森林生态与管理重点实验室, 沈阳 110016;
²中国科学院大学资源与环境学院, 北京 101408;
³湖南会同森林生态系统国家野外科学观测研究站, 亚热带森林生态系统结构与服务功能湖南省重点实验室, 湖南会同 418307;
⁴山西师范大学地理科学学院, 太原 030000

收稿日期:2022-09-13 接受日期:2023-02-20 出版日期:2023-04-15 发布日期:2023-10-15
通讯作者: *E-mail: yqp226@iae.ac.cn
作者简介:王娇, 女, 1997年生, 硕士研究生。主要从事土壤碳循环研究。E-mail: wangjiao2112@163.com
基金资助:
“十四五”国家重点研发计划项目(2021YFD2201303)和国家自然科学基金项目(41977092,U22A20612)

Effects of acid rain and root exclusion on soil organic carbon in Cunninghamia lanceolata and Michelia macclurei plantations

WANG Jiao^1,2, GUAN Xin^1,3, HUANG Ke^1,3, DUAN Xuan⁴, CHEN Bohan^1,2, ZHANG Weidong^1,3, YANG Qingpeng^1,3*

¹Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;
²College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, China;
³Huitong National Research Station of Forest Ecosystem, Hunan Key Laboratory for Structure and Ecosystem Service of Subtropical Forest, Huitong 418307, Hunan, China;
⁴College of Geographical Sciences, Shanxi Normal University, Taiyuan 030000, China

Received:2022-09-13 Accepted:2023-02-20 Online:2023-04-15 Published:2023-10-15

摘要/Abstract

摘要： 酸雨是我国严重的环境问题之一,近年来其类型逐渐由硫酸型(SAR)向混合型(MAR)和硝酸型(NAR)转变。根系不仅是土壤有机碳的来源,也在土壤团聚体形成过程中发挥重要作用。然而,酸雨类型的转变和根系去除如何影响森林土壤有机碳并不清楚。本研究在杉木和火力楠人工林中进行为期3年的不同类型酸雨(硫酸∶硝酸为4∶1、1∶1和1∶4)模拟并结合断根处理,分析土壤有机碳和理化性质的变化,并进行团聚体粒径分级及平均重量直径的测定。结果表明: 根系去除使两林分土壤有机碳库分别显著降低16.7%和21.5%,使土壤惰性有机碳含量分别显著降低13.5%和20.0%;根系去除显著降低了火力楠土壤团聚体稳定性、大团聚体比例和有机碳含量,而对杉木林无显著影响。不同类型酸雨对杉木和火力楠人工林土壤有机碳库和土壤团聚体结构均无显著影响。综上,根系在土壤有机碳的稳定中起关键作用,且根系对有机碳稳定性的贡献因森林类型而异,而短期内不同类型酸雨对土壤有机碳的稳定性无显著影响。

关键词: 硝酸型酸雨, 根系去除, 土壤团聚体, 惰性有机碳, 球囊霉素相关蛋白

Abstract: Acid rain is one of most serious environment problems in China. The types of acid rain have gradually transformed from sulfuric acid rain (SAR) to mixed acid rain (MAR) and nitric acid rain (NAR) in recent years. Roots are one source of soil organic carbon and play an important role in the formation of soil aggregates. However, the changes in acid rain type and the effect of root removal on soil organic carbon in forest ecosystems are poorly understood. In this study, we removed roots and simulated acid rain with different types (SO₄^2-:NO₃^- ratio of 4:1, 1:1, and 1:4) for three years in Cunninghamia lanceolata (CP) and Michelia macclurei (MP) plantations to analyze the changes of soil organic carbon and physical properties and to measure the size and mean weight diameter (MWD) of aggregates. Results showed that root removal in C. lanceolata and M. macclurei remarkably reduced soil organic carbon pool by 16.7 % and 21.5%, and soil recalcitrant carbon by 13.5% and 20.0%, respectively. Root removal substantially decreased the MWD and proportion and organic carbon content of soil macroaggregates in M. macclurei, but not in C. lanceolata. Acid rain did not affect soil organic carbon pool and soil aggregate structures. Our results indicated that roots promote soil organic carbon stabilization and that their contribution to the stability of soil organic carbon varies with forest types. Moreover, soil organic carbon stabilization is not affected by different types of acid rain in the short term.

Key words: nitric acid rain, root exclusion, soil aggregates, recalcitrant organic carbon, glomalin-related soil proteins

王娇, 关欣, 黄苛, 段萱, 陈波翰, 张伟东, 杨庆朋. 酸雨和根系去除对杉木和火力楠人工林土壤有机碳的影响[J]. 应用生态学报, 2023, 34(4): 937-945.

WANG Jiao, GUAN Xin, HUANG Ke, DUAN Xuan, CHEN Bohan, ZHANG Weidong, YANG Qingpeng. Effects of acid rain and root exclusion on soil organic carbon in Cunninghamia lanceolata and Michelia macclurei plantations[J]. Chinese Journal of Applied Ecology, 2023, 34(4): 937-945.

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酸雨和根系去除对杉木和火力楠人工林土壤有机碳的影响

Effects of acid rain and root exclusion on soil organic carbon in Cunninghamia lanceolata and Michelia macclurei plantations

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