N2O Emissions Mitigation in Acidic Soil Following Biochar Application Under Different Moisture Regimes

Autor: Huang Guo-qin, Muhammad Umair Hassan, Muhammad Aamer, Li Ping, Muhammad Shaaban, Tang Haiying, Adnan Rasheed, Hassan Munir, Li Xinmei, Liu Ying, Ma Qiaoying
Rok vydání: 2020
Předmět:
Zdroj: Journal of Soil Science and Plant Nutrition. 20:2454-2464
ISSN: 0718-9516
0718-9508
DOI: 10.1007/s42729-020-00311-0
Popis: Managing soil pH has been recognized as one of the promising options for N2O emission mitigation in acidic soils. Rice-straw biochar (BC) application to acidic soils can not only ameliorate soil acidity but also influence N2O emissions. We investigated the impact of various levels of rice-straw-derived biochar, a control (no biochar), 2% biochar, and 4% biochar under 50% and 90% water-filled pore space (WFPS) values. In comparison with the application of biochar at 2%, the application of biochar at 4% more pronouncedly altered soil properties (pH, ammonium (NH4+-N), nitrate (NO3-N), microbial biomass carbon (MBC), and abundance of nosZ and nirK genes). Similarly, more noticeable changes in soil properties were noted under 90% WFPS than under 50% WFPS. The soil pH increased from 5.67 to 7.29 with the 4% biochar application. In comparison with those following the 2% biochar application and the control, soil mineral N and the abundance of nosZ and nirK genes following the 4% biochar application were more augmented, thereby leading to a remarkable reduction in soil N2O emissions. The MBC content in the soil also increased with the BC applications, and the maximum MBC contents of 655 and 428 mg kg−1 dry soil were recorded with the 4% biochar application under 50% and 90% WFPS, respectively. Moreover, in comparison with the control, 4% BC mitigated soil N2O emissions by 83%, whereas cumulative N2O emissions were mitigated by 49%. In comparison with 90% WFPS, 50% WFPS produced 35% more N2O emissions. However, the biochar applications significantly (p
Databáze: OpenAIRE
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