Greenhouse gas emissions in response to straw incorporation, water management and their interaction in a paddy field in subtropical central China

Abstract

A field experiment was conducted to study the effects of combination of straw incorporation and water management on fluxes of CH 4 , N 2 O and soil heterotrophic respiration (Rh) in a paddy field in subtropical central China, by using a static opaque chamber/gas chromatography method. Four treatments were set up: two rice straw incorporation rates at 0 (S1) and 6 (S2) t ha -1 combined with two water managements of intermittent irrigation (W1, with midseason drainage) and continuous flooding (W2, without midseason drainage). The cumulative seasonal CH 4 emissions for the treatments of S1W2, S2W1, S2W2 increased Downloaded by [University of Tennessee, Knoxville] at 03:26 06 June 2016significantly by 1.84, 5.47 and 6.63 times, respectively, while seasonal N 2 O emissions decreased by 0.67, 0.29 and 1.21 times, respectively, as compared to S1W1 treatment. The significant increase in the cumulative Rh for the treatments S1W1, S2W1 and S2W2 were 0.54, 1.35 and 0.52 times, respectively, in comparison with S1W2. On a seasonal basis, both the CO 2 -equivalents (CO 2 e) and yield-scaled CO 2 e (GHGI) of CH 4 and N 2 O emissions increased with straw incorporation and continuous flooding, following the order: S2W2>S2W1>S1W2>S1W1. Thus, the practices of in season straw incorporation should be discouraged, while midseason drainage is recommended in paddy rice production from a point view of reducing greenhouse gas emissions.

Effects of nitrogen deep placement coupled with straw incorporation on grain quality and root traits from paddy fields

“…Wang et al. (2017) also reported that approximately 69% of rice straw in China was burned due to limited time to prepare for the next crop. Chinese scientists have invented a new mechanical transplanting technique that can deliver fertilizer to a depth of 10 cm (Li et al., 2020).…”

Effects of Biodegradable Plastic Film Mulching on the Global Warming Potential, Carbon Footprint, and Economic Benefits of Garlic Production

“…Global warming, resulting from significantly increased greenhouse gas (GHG) emissions since the Industrial Revolution, has become a major global problem [1] (Wang et al, 2017). The Intergovernmental Panel on Climate Change [2] (IPCC 2022) has estimated that the Earth's surface will warm by 1.5-1.6 • C by approximately 2040.…”

“…(3) What are the economic, environmental, and comprehensive benefits for garlic fields of using polyethylene and biodegradable films? The objectives of this study are as follows: (1) to compare the effects of different film covers (none, plastic, and biodegradable plastic) on GHG (CH 4 and N 2 O) emissions and garlic yields; (2) to assess the impacts of the different film covers on the carbon footprint and economic outputs of garlic production; and (3) to determine the optimal film cover method for garlic fields with regards to maximizing the film cover effect and maintaining crop yields. This research clarifies carbon sequestration and provides technical support for achieving the green and low-carbon development of the garlic industry.…”