Residence time of carbon in paddy soils

verfasst von: Yalong Liu, Tida Ge, Ping Wang, Kees Jan van Groenigen, Xuebin Xu, Kun Cheng, Zhenke Zhu, Jingkuan Wang, Georg Guggenberger, Ji Chen, Yiqi Luo, Yakov Kuzyakov
Abstract: Mean residence time (MRT) of carbon (C) in soil is the most important parameter of C sequestration and stability and crucial for CO₂ removal from the atmosphere. Climate and soil properties controls of MRT of upland soils are well known, but the drivers of C stability in paddies were never summarized. Here, we estimated MRT of paddies across monsoon Asia using the stock-over-flux method, i.e., soil organic C (SOC) stock over organic matter input considering the net primary production (NPP), and determined the main factors affecting SOC turnover. The average MRT of paddy soils in monsoon Asia ranges between 19 and 50 yr, depending on straw management. These estimates are similar to recent estimates for the global average MRT across all soils, but longer than for upland croplands. Tropical regions have the shortest MRT for rice paddies (16–42 yr), while the MRT of C in soils of temperate and subtropical regions are longer (20–56 yr). Across a wide range of environmental factors, MRT was most strongly affected by temperature. We estimate that 2 °C warming decreases MRT by 7% on average, with the strongest decreases in the western Indonesian islands and north-east China. Because C stocks per area in paddy soils are larger and the MRT is longer than in corresponding upland cropland soils, paddies play a key role in the global C cycle. Our results emphasize the need for management practices that retain stable soil C input rates to reduce possible positive feedbacks for global warming.
Organisationseinheit(en): Institut für Bodenkunde
Externe Organisation(en): Ministry of Agriculture of the People's Republic of China
Shenyang Agricultural University
Ningbo University
University of Exeter
Chinese Academy of Sciences (CAS)
Nanjing Agricultural University
Aarhus University
Northern Arizona University
Georg-August-Universität Göttingen
Typ: Artikel
Journal: Journal of cleaner production
Band: 400
ISSN: 0959-6526
Publikationsdatum: 10.05.2023
Publikationsstatus: Veröffentlicht
Peer-reviewed: Ja
ASJC Scopus Sachgebiete: Erneuerbare Energien, Nachhaltigkeit und Umwelt, Bauwesen, Umweltwissenschaften (insg.), Strategie und Management, Wirtschaftsingenieurwesen und Fertigungstechnik
Ziele für nachhaltige Entwicklung: SDG 7 – Erschwingliche und saubere Energie, SDG 13 – Klimaschutzmaßnahmen, SDG 15 – Lebensraum Land
Elektronische Version(en): https://doi.org/10.1016/j.jclepro.2023.136707 (Zugang: Geschlossen)