Journal of Food, Agriculture and Environment
Vol 11,
Issue 3&4,2013
Online ISSN: 1459-0263
Print ISSN: 1459-0255
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Effect of different winter cover crops on carbon dioxide emission and soil organic carbon content in paddy field of double cropping rice area in Southern China
Author(s):
Haiming Tang,
Xiaoping Xiao*, Wenguang Tang, Guangli Yang, Lijun GuoRecieved Date: 2013-07-11, Accepted Date: 2013-10-22
Abstract:Learning the soil organic carbon (SOC) content and characteristics of carbon dioxide (CO2) emissions from paddy fields with different double cropping rice (Oryza sativa L.) patterns will be significantly beneficial to the exploitation of winter fallow paddy with planting cover crops and the assessment of rice cropping patterns. In this paper, CO2 fluxes were measured by using field plots experiment to combine with a static chamber method to estimate the effects of straw recycling of winter cover crops measure on CO2 emissions in a double cropping rice system. The experiment was conducted on three year winter cover crops and double cropping rice rotation to quantify the effects of straw recycling of winter cover crops measure on CO2 emissions and SOC storage. The experimental plots were established in Gansha town Hunan province, China in 2008. Three treatments including rape (Brassica napus L.) with no tillage-double cropping rice (RRR), potato (Solanum tuberosum L.) with straw mulching and no tillage-double cropping rice (PRR) and fallow-double cropping rice (FRR) were designed, randomized block design was adopted in plots with three replications. During the winter cover crops season, the average daily CO2 fluxes under RRR and PRR were greater than FRR. In addition, the fluxes and emission of CO2 were varied with different winter cover crops in the order: RRR>PRR>FRR in early season, PRR>RRR>FRR in later season, respectively. Straw recycling of winter cover crops measure had a significant influence on average CO2 fluxes during rice season. The average CO2 fluxes during early rice and late rice season were similar. The largest CO2 flux was observed at tillering stage in rice season, and the order of early and late rice was PRR>RRR>FRR and RRR>PRR>FRR, respectively. The average annual CO2 emissions under RRR (2205.58 g CO2-C m-2) and PRR (2283.90 g CO2-C m-2) were significantly higher than FRR (1561.36 g CO2-C m-2). These results indicated that, during the winter cover crops and rice growing season, CO2 emissions of RRR and PRR was averagely increased by 644.22 and 722.54 g CO2-C m-2 compared to FRR, respectively. After 3 years of winter cover crops and rice growing, the pool of SOC in the top 20 cm depth under RRR (17.84 g kg-1) and PRR (17.92 g kg-1) was significantly higher than under FRR (17.72 g kg-1). The SOC content for 0-20 cm depth under RRR and PRR treatments were increased by 2.53% and 2.99%, respectively, compared to previous experiment. The results showed that winter cover crops measure presented beneficial effect on SOC sequestration and strongly influence the CO2 emission from soils.
Keywords:CO2 flux,
soil organic carbon, winter cover crop, paddy field, double cropping riceJournal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Environment
Pages: 1513-1520
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