TITLE

Assessment of carbon sustainability under different tillage systems in a double rice cropping system in Southern China

AUTHOR(S)
Xue, Jian-Fu; Liu, Sheng-Li; Chen, Zhong-Du; Chen, Fu; Lal, Rattan; Tang, Hai-Ming; Zhang, Hai-Lin
PUB. DATE
September 2014
SOURCE
International Journal of Life Cycle Assessment;Sep2014, Vol. 19 Issue 9, p1581
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Purpose: Adoption of the carbon (C)-friendly and cleaner technology is an effective solution to offset some of the anthropogenic emissions. Conservation tillage is widely considered as an important sustainable technology and for the development of conservation agriculture (CA). Thus, the objective of this study was to assess the C sustainability of different tillage systems in a double rice ( Oryza sativa L.) cropping system in southern China. Methods: The experiment was established with no-till (NT), rotary tillage (RT), and conventional tillage (CT) treatments since 2005. Emission of greenhouse gasses (GHG), C footprint (CF), and ecosystem service through C sequestration in different tillage systems were compared. Result and discussion: Emission of GHG from agricultural inputs (Mg CO-eq ha year) ranged from 1.81 to 1.97 for the early rice, 1.82 to 1.98 for the late rice, and 3.63 to 3.95 for the whole growing season, respectively. The CF (kg CO-eq kg of rice year) in the whole growing seasons were 1.27, 1.85, and 1.40 [excluding soil organic carbon (SOC) storage] and 0.54, 1.20, and 0.72 (including SOC storage) for NT, RT, and CT, respectively. The value of ecosystem services on C sequestration for the whole growing seasons ranged from ¥3,353 to 4,948 ha year and followed the order of NT > CT > RT. The C sustainability under NT was better than that under RT for the late, but reversed for the early rice. However, NT system had better C sustainability for the whole cropping system compared with CT. Conclusions: Therefore, NT is a preferred technology to reduce GHG emissions, increase ecosystem service functions of C sequestration, and improve C sustainability in a double rice cropping region of Southern China.
ACCESSION #
97459805

 

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