凋落物输入对土壤可溶性有机碳的影响

doi:10.13292/j.1000-4890.202309.016

生态学杂志 ›› 2023, Vol. 42 ›› Issue (9): 2107-2112.doi: 10.13292/j.1000-4890.202309.016

凋落物输入对土壤可溶性有机碳的影响

张玉¹,吴福忠^1,2,3,艾灵¹,樊雪波¹,杨颖¹,郑夏萍¹,朱晶晶¹,倪祥银^1,2,3*

（¹福建师范大学地理科学学院，福州 350117； ²湿润亚热带生态—地理过程教育部重点实验室，福州 350117； ³福建三明森林生态系统国家野外科学观测研究站，福建三明 365002）

出版日期:2023-09-10 发布日期:2023-08-30

Litter input effects on soil dissolved organic carbon.

ZHANG Yu¹, WU Fuzhong^1,2,3, AI Ling¹, FAN Xuebo¹, YANG Ying¹, ZHENG Xiaping¹, ZHU Jingjing¹, NI Xiangyin^1,2,3*#br#

#br#

(¹School of Geographical Sciences, Fujian Normal University, Fuzhou 350117, China; ²Key Laboratory for Humid Subtropical Eco-Geographical Processes of the Ministry of Education, Fujian Normal University, Fuzhou 350117, China; ³Sanming Forest Ecosystem National Observation and Research Station, Sanming 365002, Fujian, China).

Online:2023-09-10 Published:2023-08-30

摘要/Abstract

摘要： 可溶性有机碳（DOC）受淋溶强烈，且可被土壤微生物快速同化，是陆地生态系统生物地球化学循环的关键组分之一。凋落物输入是土壤DOC的重要来源，但在不同生态系统中，植被类型和覆盖度的不同导致地表凋落物种类和数量不同，同时不同类型的凋落物化学组成不同，直接影响凋落物分解进程和DOC释放。因此，评估不同生态系统中不同类型的凋落物添加和去除后土壤DOC含量变化，对于认识土壤生物地球化学过程具有重要意义。本文整理了全球已发表的47篇文献中共494组配对数据(对照与凋落物添加/去除)，评估了不同凋落物类型(叶、根、叶+根)、生态系统类型(森林、草地)和处理时间(<1、1～3、3～6、>6月)条件下，凋落物添加和去除对土壤DOC含量的影响。结果表明：总体上看，添加凋落叶提高了土壤DOC含量(28.9%)，而去除凋落叶、根及同时去除凋落叶和根分别使土壤DOC含量降低了23.1%、6.6%、16.9%。添加凋落物使草地和森林土壤DOC含量分别提高了28.6%和28.5%，而去除凋落物后，草地和森林土壤DOC含量分别降低了30.4%和21.2%。土壤DOC含量对凋落物添加的响应迅速，在添加1个月内增长较快(29.6%)，之后逐渐减弱，但处理6个月后增长较快(34.0%)。去除凋落物后，土壤DOC含量迅速下降，在1个月内降低幅度最大（65.2%），后期逐渐减弱。这些结果表明，凋落物输入是土壤DOC的重要来源，其中凋落叶的贡献约是根的3.5倍，且土壤DOC对早期凋落物输入更加敏感，这对深入认识以DOC为载体的陆地生态系统生物地球化学过程具有重要意义。

关键词: 凋落物输入, 凋落物添加, 凋落物去除, 可溶性有机碳

Abstract: Dissolved organic carbon (DOC) could be leached rapidly from soils and assimilated by soil microorganisms, and thus is one of key components of biogeochemical cycles in terrestrial ecosystems. Litter is an important source of soil DOC, but the types and amounts of surface litter vary greatly in different ecosystems due to the divergent vegetation types and coverage. Moreover, chemical composition of different litter types directly affects DOC release during decomposition. Therefore, assessing the changes in soil DOC concentrations under litter inputs is of great significance for understanding soil biogeochemical processes. We compiled 494 paired observations (with and without litter addition or removal) from 47 literature to evaluate the changes in soil DOC concentrations under double litter addition or removal of different litter types (leaf litter, roots and both leaf litter and roots) across ecosystems (forests and grasslands) over different experimental periods (<1, 1-3, 3-6 and >6 months). The results showed that double litter addition significantly increased soil DOC by 28.9%, while soil DOC concentrations were reduced by 23.1%, 6.6% and 16.9% after removal of leaf litter, roots, or both, respectively. Soil DOC concentrations in grasslands and forests were increased by 28.6% and 28.5% under double litter input, but were decreased by 30.4% and 21.2% after litter removal, respectively. Soil DOC concentration increased rapidly by 29.6% within one month of double litter addition, but this increase was gradually slowed down in the later periods, yet soil DOC concentration was then increased rapidly by 34.0% after six months of manipulation. Similarly, litter removal decreased soil DOC concentration by 65.2% within one month of manipulation, but such effect was gradually slowed down in the later periods. These results suggest that litter is an important source of soil DOC, and that the contribution of leaf litter is approximately 3.5 times higher than roots. Our global synthesis figures out the interactions between litter inputs and soil DOC, which improve our mechanistic understanding of biogeochemistry in terrestrial ecosystems.

Key words: litter input, litter addition, litter removal, dissolved organic carbon.

张玉, 吴福忠, 艾灵, 樊雪波, 杨颖, 郑夏萍, 朱晶晶, 倪祥银. 凋落物输入对土壤可溶性有机碳的影响[J]. 生态学杂志, 2023, 42(9): 2107-2112.

ZHANG Yu, WU Fuzhong, AI Ling, FAN Xuebo, YANG Ying, ZHENG Xiaping, ZHU Jingjing, NI Xiangyin. Litter input effects on soil dissolved organic carbon.[J]. Chinese Journal of Ecology, 2023, 42(9): 2107-2112.

凋落物输入对土壤可溶性有机碳的影响

Litter input effects on soil dissolved organic carbon.

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