Comparison of carbon footprint and net ecosystem carbon budget under organic material retention combined with reduced mineral fertilizer

Carbon Balance and Management

Haiying Tang¹  Ying Liu¹  Chuan Zhong²  Pete Smith³  Guoqin Huang⁴ 

[1] College of Agriculture and Biotechnology, Hunan University of Humanities, Science and Technology, Dixing Road, Louxing District, 417000, Loudi, Hunan, China;Research Center on Ecological Sciences, Jiangxi Agricultural University, No. 1101 Zhimin Avenue, Nanchang Economic and Technological Development Zone, 330045, Nanchang, Jiangxi, China;College of Agriculture, Nanjing Agricultural University, 210095, Nanjing, China;Institute of Biological and Environmental Sciences, School of Biological Sciences, University of Aberdeen, 23 St Machar Drive, Room G45, AB24 3UU, Aberdeen, Scotland, UK;Research Center on Ecological Sciences, Jiangxi Agricultural University, No. 1101 Zhimin Avenue, Nanchang Economic and Technological Development Zone, 330045, Nanchang, Jiangxi, China;

关键词: Astragalus sinicus;    Rice straw;    Reduced mineral fertilizer;    Carbon footprint;    Greenhouse gas emissions;    Net ecosystem carbon budget;   

DOI  :  10.1186/s13021-021-00170-x

来源: Springer

【 摘 要 】

BackgroundExcessive application of chemical fertilizer has resulted in lower nitrogen uptake and utilization efficiency of crops, decreasing soil fertility, increasing greenhouse gas emissions, and worse environmental pollution. Organic material retention is regard as the key to solve these problems. The objective of this study is to conduct an assessment of carbon budget under Astragalus sinicus L. and rice straw retention combined with reduced mineral fertilizer based on the 2-year field experiment in a paddy field in the south of China. The experiment was randomized complete block design including four treatments with triplicates: control CK (winter follow, 120 kg ha−1 N fertilizer for each rice season) and three treatments with Astragalus sinicus L. and rice straw retention named RA, RB, and RC (reduced N fertilizer by 15%, 27.5%, and 40% in each rice season).ResultsTreatments RA, RB, and RC increased greenhouse gas emissions by 9.30–101.25%, among which CH4 accounted for more than 60%; Carbon input of crops from treatments RA, RB, and RC increased by 2.25–12.10% compared with control CK over the 2 years. Though treatments RA, RB, and RC enhanced CO2 emissions, treatment RB decreased carbon footprint and became carbon sink.ConclusionsThe results of this study reveal that treatment RB (Astragalus sinicus L. and rice straw retention with reduced N fertilizer by 27.5%) is better in reducing chemical fertilizer amount, increasing crop yield and carbon input, which is more conductive to sustainable development of agriculture.

【 授权许可】

CC BY