Accelerated organic matter decomposition in thermokarst lakes upon carbon and phosphorus inputs
Abstract Mineralization of dissolved organic matter (DOM) in thermokarst lakes plays a non‐negligible role in the permafrost carbon (C) cycle, but remains poorly understood due to its complex interactions with external C and nutrient inputs (i.e., aquatic priming and nutrient effects). Based on larg...
Published in: | Global Change Biology |
---|---|
Main Authors: | , , , , , , , , , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2023
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1111/gcb.16938 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.16938 |
id |
crwiley:10.1111/gcb.16938 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1111/gcb.16938 2024-09-15T18:30:00+00:00 Accelerated organic matter decomposition in thermokarst lakes upon carbon and phosphorus inputs Li, Ziliang Xu, Weijie Kang, Luyao Kuzyakov, Yakov Chen, Leiyi He, Mei Liu, Futing Zhang, Dianye Zhou, Wei Liu, Xuning Yang, Yuanhe National Natural Science Foundation of China National Basic Research Program of China 2023 http://dx.doi.org/10.1111/gcb.16938 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.16938 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Global Change Biology volume 29, issue 22, page 6367-6382 ISSN 1354-1013 1365-2486 journal-article 2023 crwiley https://doi.org/10.1111/gcb.16938 2024-08-30T04:09:57Z Abstract Mineralization of dissolved organic matter (DOM) in thermokarst lakes plays a non‐negligible role in the permafrost carbon (C) cycle, but remains poorly understood due to its complex interactions with external C and nutrient inputs (i.e., aquatic priming and nutrient effects). Based on large‐scale lake sampling and laboratory incubations, in combination with 13 C‐stable‐isotope labeling, optical spectroscopy, and high‐throughput sequencing, we examined large‐scale patterns and dominant drivers of priming and nutrient effects of DOM biodegradation across 30 thermokarst lakes along a 1100‐km transect on the Tibetan Plateau. We observed that labile C and phosphorus (P) rather than nitrogen (N) inputs stimulated DOM biodegradation, with the priming and P effects being 172% and 451% over unamended control, respectively. We also detected significant interactive effects of labile C and nutrient supply on DOM biodegradation, with the combined labile C and nutrient additions inducing stronger microbial mineralization than C or nutrient treatment alone, illustrating that microbial activity in alpine thermokarst lakes is co‐limited by both C and nutrients. We further found that the aquatic priming was mainly driven by DOM quality, with the priming intensity increasing with DOM recalcitrance, reflecting the limitation of external C as energy sources for microbial activity. Greater priming intensity was also associated with higher community‐level ribosomal RNA gene operon ( rrn ) copy number and bacterial diversity as well as increased background soluble reactive P concentration. In contrast, the P effect decreased with DOM recalcitrance as well as with background soluble reactive P and ammonium concentrations, revealing the declining importance of P availability in mediating DOM biodegradation with enhanced C limitation but reduced nutrient limitation. Overall, the stimulation of external C and P inputs on DOM biodegradation in thermokarst lakes would amplify C‐climate feedback in this alpine permafrost region. Article in Journal/Newspaper permafrost Thermokarst Wiley Online Library Global Change Biology 29 22 6367 6382 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract Mineralization of dissolved organic matter (DOM) in thermokarst lakes plays a non‐negligible role in the permafrost carbon (C) cycle, but remains poorly understood due to its complex interactions with external C and nutrient inputs (i.e., aquatic priming and nutrient effects). Based on large‐scale lake sampling and laboratory incubations, in combination with 13 C‐stable‐isotope labeling, optical spectroscopy, and high‐throughput sequencing, we examined large‐scale patterns and dominant drivers of priming and nutrient effects of DOM biodegradation across 30 thermokarst lakes along a 1100‐km transect on the Tibetan Plateau. We observed that labile C and phosphorus (P) rather than nitrogen (N) inputs stimulated DOM biodegradation, with the priming and P effects being 172% and 451% over unamended control, respectively. We also detected significant interactive effects of labile C and nutrient supply on DOM biodegradation, with the combined labile C and nutrient additions inducing stronger microbial mineralization than C or nutrient treatment alone, illustrating that microbial activity in alpine thermokarst lakes is co‐limited by both C and nutrients. We further found that the aquatic priming was mainly driven by DOM quality, with the priming intensity increasing with DOM recalcitrance, reflecting the limitation of external C as energy sources for microbial activity. Greater priming intensity was also associated with higher community‐level ribosomal RNA gene operon ( rrn ) copy number and bacterial diversity as well as increased background soluble reactive P concentration. In contrast, the P effect decreased with DOM recalcitrance as well as with background soluble reactive P and ammonium concentrations, revealing the declining importance of P availability in mediating DOM biodegradation with enhanced C limitation but reduced nutrient limitation. Overall, the stimulation of external C and P inputs on DOM biodegradation in thermokarst lakes would amplify C‐climate feedback in this alpine permafrost region. |
author2 |
National Natural Science Foundation of China National Basic Research Program of China |
format |
Article in Journal/Newspaper |
author |
Li, Ziliang Xu, Weijie Kang, Luyao Kuzyakov, Yakov Chen, Leiyi He, Mei Liu, Futing Zhang, Dianye Zhou, Wei Liu, Xuning Yang, Yuanhe |
spellingShingle |
Li, Ziliang Xu, Weijie Kang, Luyao Kuzyakov, Yakov Chen, Leiyi He, Mei Liu, Futing Zhang, Dianye Zhou, Wei Liu, Xuning Yang, Yuanhe Accelerated organic matter decomposition in thermokarst lakes upon carbon and phosphorus inputs |
author_facet |
Li, Ziliang Xu, Weijie Kang, Luyao Kuzyakov, Yakov Chen, Leiyi He, Mei Liu, Futing Zhang, Dianye Zhou, Wei Liu, Xuning Yang, Yuanhe |
author_sort |
Li, Ziliang |
title |
Accelerated organic matter decomposition in thermokarst lakes upon carbon and phosphorus inputs |
title_short |
Accelerated organic matter decomposition in thermokarst lakes upon carbon and phosphorus inputs |
title_full |
Accelerated organic matter decomposition in thermokarst lakes upon carbon and phosphorus inputs |
title_fullStr |
Accelerated organic matter decomposition in thermokarst lakes upon carbon and phosphorus inputs |
title_full_unstemmed |
Accelerated organic matter decomposition in thermokarst lakes upon carbon and phosphorus inputs |
title_sort |
accelerated organic matter decomposition in thermokarst lakes upon carbon and phosphorus inputs |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1111/gcb.16938 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.16938 |
genre |
permafrost Thermokarst |
genre_facet |
permafrost Thermokarst |
op_source |
Global Change Biology volume 29, issue 22, page 6367-6382 ISSN 1354-1013 1365-2486 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/gcb.16938 |
container_title |
Global Change Biology |
container_volume |
29 |
container_issue |
22 |
container_start_page |
6367 |
op_container_end_page |
6382 |
_version_ |
1810471483827290112 |