Effects of biochar amendment on greenhouse gas emission in two paddy soils with different textures
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ARTICLE
Effects of biochar amendment on greenhouse gas emission in two paddy soils with different textures Jieyun Liu1,2 · Husen Qiu1,2 · Cong Wang3 · Jianlin Shen2 · Wenzheng Zhang1 · Jiumao Cai1 · Hong Tang4 · Jinshui Wu2 Received: 28 July 2019 / Revised: 6 July 2020 / Accepted: 7 September 2020 © The International Society of Paddy and Water Environment Engineering 2020
Abstract To study the greenhouse gas (GHG) emission with biochar amendment in two or more soils with different textures, an incubation experiment was carried out with two paddy soils (developed from granite-weathered red soil (S1) and from quaternary red clay (S2)) with different textures in flooding condition. The soils were subjected to the following three biochar (derived from wheat straw) treatments: 0%, 1% and 2% of soil weight, represented by CK, LC and HC, respectively. The incubation lasted for 180 d. Biochar significantly increased CO2 emission by 5.8–9.9% in S1. Biochar can combine with soil particles and provide a suitable habitat for soil microbes in S1, which increased organic C decomposition. However, biochar had no effect on C O2 emission in S2, which was due to soil aggregate formation with biochar amendment. Furthermore, biochar addition considerably reduced C H4 emission by 19.8–28.2% and 31.7–37.1% in comparison with those in CK in S1 and S2. Increased soil pH and decreased soil N H4+–N contributed to the reduction in CH4 emission. However, due to soluble C and N within biochar, N 2O emissions with biochar amendment were significantly increased by 22.8–27.5% and 36.5–42.8% compared with those in CK in S1 and S2, which mainly occurred in the first 5 d. The increase in N 2O emission with biochar amendment in S2 was higher than that in S1, which can be attributed to improved soil aeration with biochar application in silt clay loam soil. The net greenhouse gas emission (NGHGE, C O2-equivalents), based on the global warming potential of which for a given time horizon (e.g., 100 years), was used to assess the climatic impacts. Due to C sequestration of biochar, biochar amendment significantly decreased the NGHGE by 5123–10,250% and 5480–10,958% in S1 and S2. This study provides a theoretical basis for the application of biochar in paddy field. Keywords Biochar · Greenhouse gas emission · Paddy soil · Soil texture
Introduction
Jieyun Liu and Husen Qiu have contributed equally to this paper. * Jianlin Shen [email protected] 1
Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
2
Key Laboratory of Agro‑ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, Hunan, China
3
College of Forestry, Guangxi University, Nanning 530004, China
4
College of Environment and Life Science, Kaili University, Kaili 556011, China
The average surface temperature has increased by 0.85 °C during 1880–2012, and it is likely to increase by another 0.3–4.8 °C by the end of this century (IPCC 2013). Glob
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