Short-term effects of raw rice straw and its derived biochar on greenhouse gas emission in five typical soils in China(Environment)

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概要

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• A short-term study was conducted to investigate the greenhouse gas emissions in five typical soils under two crop residue management practices: raw rice straw (Oryza sativa L., cv) and its derived biochar application. Rice straw and its derived biochar (two biochars, produced at 350 and 500℃ and referred to as BC350 and BC500, respectively) were incubated with the soils at a 5% (weight/weight) rate and under 70% water holding capacity for 28 d. Incorporation of BC500 into soils reduced carbon dioxide (CO_2) and nitrous oxide (N_2O) emission in all five soils by 4-40% and 62-98%, respectively, compared to the untreated soils, whereas methane (CH_4) emission was elevated by up to about 2 times. Contrary to the biochars, direct return of the straw to soil reduced CH_4 emission by 22-69%, whereas CO_2 increased by 4 to 34 times. For N_2O emission, return of rice straw to soil reduced it by over 80% in two soils, while it increased by up to 14 times in other three soils. When all three greenhouse gases were normalized on the CO_2 basis, the global warming potential in all treatments followed the order of straw > BC350 > control > BC500 in all five soils. The results indicated that turning rice straw into biochar followed by its incorporation into soil was an effective measure for reducing soil greenhouse gas emission, and the effectiveness increased with increasing biochar production temperature, whereas direct return of straw to soil enhanced soil greenhouse gas emissions.

• 一般社団法人日本土壌肥料学会の論文

著者

• Yang Fan

  School Of Computer Science And Engineering University Of Electronic Science And Technology Of China

• CAO Xinde

  School of Environmental Science and Engineering, Shanghai Jiao Tong University

• LI Feiyue

  School of Environmental Science and Engineering, Shanghai Jiao Tong University

• ZHAO Ling

  School of Environmental Science and Engineering, Shanghai Jiao Tong University

• WANG Jianfei

  College of Urban Construction and Environment Science, Anhui Science and Technology University

• WANG Shuwei

  Changshu Agroecological Experimental Station, Chinese Academy of Science

• YANG Fan

  School of Environmental Science and Engineering, Shanghai Jiao Tong University

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