应用生态学报 ›› 2021, Vol. 32 ›› Issue (3): 825-835.doi: 10.13287/j.1001-9332.202103.008
洪小敏1, 魏强1, 李梦娇1, 余坦蔚1, 严强2, 胡亚林1*
收稿日期:
2020-09-29
接受日期:
2020-12-29
出版日期:
2021-03-15
发布日期:
2021-09-15
通讯作者:
* E-mail: huyl@iae.ac.cn
作者简介:
洪小敏, 女, 1995年生, 硕士研究生。主要从事森林碳循环研究。E-mail: hhongxm@163.com
基金资助:
HONG Xiao-min1, WEI Qiang1, LI Meng-jiao1, YU Tan-wei1, YAN Qiang2, HU Ya-lin1*
Received:
2020-09-29
Accepted:
2020-12-29
Online:
2021-03-15
Published:
2021-09-15
Contact:
* E-mail: huyl@iae.ac.cn
Supported by:
摘要: 凋落物是森林土壤有机碳(SOC)形成、稳定和周转的重要影响因子。目前针对亚热带不同类型森林地上和地下凋落物对新SOC累积和老SOC输出动态平衡的影响仍不清楚。本研究以中亚热带常绿阔叶天然林、马尾松人工林和杉木人工林为对象,基于C3/C4植物-土壤置换试验,利用稳定同位素13C示踪方法开展3年野外定位试验,分析了森林地上、地下凋落物输入对SOC周转的影响。结果表明: 森林类型、凋落物处理和时间均能显著影响SOC含量、土壤δ13C值、新SOC和老SOC含量,且存在显著的森林类型×凋落物处理交互效应。地上和地下凋落物输入均能显著提高SOC含量和净增量,与杉木人工林相比,天然林SOC对凋落物输入的响应更敏感。凋落物输入显著降低了土壤δ13C值,且天然林、马尾松人工林土壤δ13C显著低于杉木人工林。在马尾松人工林,地下凋落物处理的新SOC含量显著高于地上凋落物;在天然林和马尾松人工林,地下凋落物输入处理的老SOC含量显著低于地上凋落物处理。此外,地上凋落物归还量和地下根生物量与SOC含量和净增量呈显著正相关,而地下根凋落物量和C/N与新SOC含量呈显著正相关。森林地下凋落物比地上凋落物输入对SOC周转的影响更重要,且不同森林凋落物输入对SOC的影响存在差异性。本研究可为揭示亚热带典型森林土壤有机碳库的形成和可持续管理提供依据。
洪小敏, 魏强, 李梦娇, 余坦蔚, 严强, 胡亚林. 亚热带典型森林地上和地下凋落物输入对土壤新老有机碳动态平衡的影响[J]. 应用生态学报, 2021, 32(3): 825-835.
HONG Xiao-min, WEI Qiang, LI Meng-jiao, YU Tan-wei, YAN Qiang, HU Ya-lin. Effects of aboveground and belowground litter inputs on the balance of soil new and old organic carbon under the typical forests in subtropical region[J]. Chinese Journal of Applied Ecology, 2021, 32(3): 825-835.
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