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应用生态学报 ›› 2022, Vol. 33 ›› Issue (10): 2602-2610.doi: 10.13287/j.1001-9332.202210.016

• 陆地生态系统固碳与增汇专栏 • 上一篇    下一篇

不同化学性质叶凋落物添加对土壤有机碳矿化及激发效应的影响

陈甜, 元方慧, 张琳梅, 胡亚林*   

  1. 福建农林大学林学院森林生态-稳定同位素研究中心, 福州 350002
  • 收稿日期:2022-02-23 修回日期:2022-08-06 出版日期:2022-10-15 发布日期:2023-04-15
  • 通讯作者: * E-mail: huyl@iae.ac.cn
  • 作者简介:陈甜, 女, 1996年生, 硕士研究生。主要从事森林土壤碳循环研究。E-mail: ct1996318627@163.com
  • 基金资助:
    国家自然科学基金促进海峡两岸科技合作联合基金重点项目(U1805243)和国家自然科学基金面上项目(42077094)

Effects of addition of leaf litter with different chemical properties on soil organic carbon mineralization and priming effect

CHEN Tian, YUAN Fang-hui, ZHANG Lin-mei, HU Ya-lin*   

  1. Forest Ecology & Stable Isotope Center, College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
  • Received:2022-02-23 Revised:2022-08-06 Online:2022-10-15 Published:2023-04-15

摘要: 凋落物输入可显著影响土壤有机碳(SOC)矿化速率,但添加不同化学性质叶凋落物对土壤有机碳矿化释放CO2及激发效应的影响及其机理仍不清楚。本研究将亚热带6种树种13C标记的叶凋落物添加至天然次生林0~10 cm原位土柱中,比较不同树种叶凋落物添加对土壤总CO2、外源凋落物和土壤来源CO2释放速率和累积量以及激发效应的影响,并量化叶凋落物化学性质与土壤CO2释放累积量、激发效应的相关关系。结果表明: 添加叶凋落物能够显著提高土壤总CO2和土壤来源CO2释放量,存在显著正激发效应,激发效应值为68%~128%。不同树种叶凋落物添加对土壤有机碳矿化和激发效应的影响存在显著差异。Pearson相关分析和逐步多元线性回归分析发现,凋落物来源CO2释放累积量与叶凋落物C、P和纤维素含量呈显著负相关,而土壤来源CO2释放量与叶凋落物C:N和木质素:N呈显著正相关。综上,不同化学性质的叶凋落物对土壤有机碳矿化和激发效应的影响存在异质性,在亚热带地区森林类型转变过程中营造具有高质量叶凋落物的人工林将有助于减少森林土壤碳损失。

关键词: 亚热带森林, 树种, 叶凋落物化学性质, 土壤有机碳矿化, 激发效应

Abstract: Litter inputs can affect the mineralization of soil organic carbon (SOC). However, it is yet unknown how the input of leaf litter with different chemical properties drives SOC mineralization and priming effect. In this study, 13C-labeled leaf litter of six tree species were added to soil cores (10 cm depth) collected from a natural secondary forest in subtropical region. We examined the effects of different leaf litters on total soil CO2, litter-derived and soil-derived CO2 emission rates and accumulation and priming effect. We further examined the relationships between litter chemical properties and CO2 accumulation and priming effect. Our results showed that leaf litter addition increased total soil CO2 and soil-derived CO2 emission rates and accumulations, and that there were positive priming effects ranging from 68% to 128%. Soil organic carbon mineralization and priming effects varied among tree species. The Pearson correlation and stepwise multiple linear regression analysis showed that the litter-derived CO2 accumulation had negative correlation with leaf litter C, P and cellulose concentrations, whereas the soil-derived CO2 accumulation were positively correlated to litter C:N and lignin:N. The results implied that tree species could influence SOC mineralization and litter-induced priming effect. Thus it could mitigate soil C loss when we afforested plantation with high quality leaf litter in subtropical region.

Key words: subtropical forest, tree species, leaf litter chemical property, soil organic carbon mineralization, pri-ming effect