TY - JOUR

T1 - Three source-partitioning of CO2 fluxes based on a dual-isotope approach to investigate interactions between soil organic carbon, glucose and straw

AU - Chen, Zhiyi

AU - Kumar, Amit

AU - Brookes, Philip C.

AU - Kuzyakov, Yakov

AU - Luo, Yu

AU - Xu, Jianming

N1 - Copyright © 2021. Published by Elsevier B.V.

PY - 2022/3/10

Y1 - 2022/3/10

N2 - Inputs of available organic materials into soil alter the decomposition of soil organic matter (SOM), a process called priming effect. Organic carbon (C) inputs in terrestrial ecosystems are common from various sources (e.g. rhizodeposits, plant residues, microbial necromass) simultaneously, but their interactions as well as mutual effects on SOM decomposition are unknown because multisource partitioning of pools and fluxes was not available. A dual-isotope approach (identical materials except for straw being possessed two 13C abundances) was adopted to partition total CO2 emission from three C sources: SOM, glucose and straw. Cumulative CO2 efflux was quantified into straw-derived (558 μg C g−1), glucose-derived (480 μg C g−1) and SOM-derived (58 μg C g−1) CO2 during the first 7 days of incubation. Glucose or straw addition induced positive SOM priming, whereas glucose combined with straw resulted in higher SOC loss than that induced by single addition of glucose or straw after day 7. The Spearman's correlation showed that the interactions between glucose and straw shifted from increased CO2 evolved during their intensive decomposition (days 1 to 3) to mutual constraint on mineralization during the late stage (days 5 to 7). This study provides evidences for the suitability of the dual-isotope approach to partition multiple sources of CO2 fluxes and C pools, and evaluates their individual or mutual contributions to SOM priming, thus, implicating C sequestration in terrestrial ecosystems.

AB - Inputs of available organic materials into soil alter the decomposition of soil organic matter (SOM), a process called priming effect. Organic carbon (C) inputs in terrestrial ecosystems are common from various sources (e.g. rhizodeposits, plant residues, microbial necromass) simultaneously, but their interactions as well as mutual effects on SOM decomposition are unknown because multisource partitioning of pools and fluxes was not available. A dual-isotope approach (identical materials except for straw being possessed two 13C abundances) was adopted to partition total CO2 emission from three C sources: SOM, glucose and straw. Cumulative CO2 efflux was quantified into straw-derived (558 μg C g−1), glucose-derived (480 μg C g−1) and SOM-derived (58 μg C g−1) CO2 during the first 7 days of incubation. Glucose or straw addition induced positive SOM priming, whereas glucose combined with straw resulted in higher SOC loss than that induced by single addition of glucose or straw after day 7. The Spearman's correlation showed that the interactions between glucose and straw shifted from increased CO2 evolved during their intensive decomposition (days 1 to 3) to mutual constraint on mineralization during the late stage (days 5 to 7). This study provides evidences for the suitability of the dual-isotope approach to partition multiple sources of CO2 fluxes and C pools, and evaluates their individual or mutual contributions to SOM priming, thus, implicating C sequestration in terrestrial ecosystems.

KW - Dual-stable isotope labeling

KW - Organic matter decomposition

KW - Soil priming effect

KW - Substrate decomposability

KW - Three sources partitioning

KW - Ecosystems Research

UR - http://www.scopus.com/inward/record.url?scp=85121308744&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/22caa78d-02da-3c24-8991-5ed2064d232b/

U2 - 10.1016/j.scitotenv.2021.152163

DO - 10.1016/j.scitotenv.2021.152163

M3 - Journal articles

C2 - 34875335

AN - SCOPUS:85121308744

VL - 811

JO - Science of the Total Environment

JF - Science of the Total Environment

SN - 0048-9697

M1 - 152163

ER -