Net global warming potential and greenhouse gas intensity of annual rice–wheat rotations with integrated soil–crop system management

Ma, Yuan; Kong, Xueqin; Yang, Bo; Zhang, X.L.; Yan, Xiaoyuan; Yang, Jianchang; Xiong, Zhengqin

doi:10.1016/j.agee.2012.11.003

Cited by 229 publications

(112 citation statements)

References 60 publications

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“…Thus, this indicates that relatively high yields and lower carbon costs can be achieved simultaneously by optimizing Nand straw management. The NGWP in our study (1346-4684 kg CO 2 -eq ha −1 ) was much lower than in rice-wheat rotations (6660-9710 kg CO 2 -eq ha −1 ) (Ma et al, 2013) and double-rice-cropping systems (13 407-26 066 kg CO 2 -eq ha −1 ) (Shang et al, 2011), in both of which CH 4 emission was the main contributor to the high GWP. However, CH 4 is a very small sink in our upland cropping system and CH 4 uptake makes little contribution when calculating the NGWP from all emissions and sinks.…”

Section: Impacts Of N Application and Straw Return On Ngwp And Ghgicontrasting

confidence: 65%

“…However, these practices may also stimulate N 2 O emissions by increasing the supply of substrates for soil nitrifiers and denitrifiers, and the resulting increase in microbial activity may offset the SOC sequestration effects (Pathak et al, 2005). Field practices that change some soil conditions to mitigate one form of GHG emissions may bring about favourable conditions for other forms of emissions and thereby change the overall balance of GHGs (Pathak et al, 2005;Shang et al, 2011;Ma et al, 2013). To measure these overall effects in any given system the concept of net global warming potential (NGWP) was proposed based on the radiative properties of all the GHG emissions and carbon fixation, expressed as CO 2 -eq ha −1 yr −1 , to give an integrated evaluation of whether the system is positive or negative in terms of CO 2 -eq (Robertson and Grace, 2004).…”

Section: Introductionmentioning

confidence: 99%

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Net global warming potential and greenhouse gas intensity in a double-cropping cereal rotation as affected by nitrogen and straw management

et al. 2013

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Abstract. The effects of nitrogen and straw management on global warming potential (GWP) and greenhouse gas intensity (GHGI) in a winter wheat-summer maize doublecropping system on the North China Plain were investigated. We measured nitrous oxide (N 2 O) emissions and studied net GWP (NGWP) and GHGI by calculating the net exchange of CO 2 equivalent (CO 2 -eq) from greenhouse gas emissions, agricultural inputs and management practices, as well as changes in soil organic carbon (SOC), based on a long-term field experiment established in 2006. The field experiment includes six treatments with three fertilizer N levels (zero N (control), optimum and conventional N) and straw removal (i.e. N 0 , N opt and N con ) or return (i.e. SN 0 , SN opt and SN con ). Optimum N management (N opt , SN opt ) saved roughly half of the fertilizer N compared to conventional agricultural practice (N con , SN con ), with no significant effect on grain yields. Annual mean N 2 O emissions reached 3.90 kg N 2 O-N ha −1 in N con and SN con , and N 2 O emissions were reduced by 46.9 % by optimizing N management of N opt and SN opt . Straw return increased annual mean N 2 O emissions by 27.9 %. Annual SOC sequestration was 0.40-1.44 Mg C ha −1 yr −1 in plots with N application and/or straw return. Compared to the conventional N treatments the optimum N treatments reduced NGWP by 51 %, comprising 25 % from decreasing N 2 O emissions and 75 % from reducing N fertilizer application rates. Straw return treatments reduced NGWP by 30 % compared to no straw return because the GWP from increments of SOC offset the GWP from higher emissions of N 2 O, N fertilizer and fuel after straw return. The GHGI trends from the different nitrogen and straw management practices were similar to the NGWP. In conclusion, optimum N and straw return significantly reduced NGWP and GHGI and concomitantly achieved relatively high grain yields in this important winter wheat-summer maize double-cropping system.

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Section: Impacts Of N Application and Straw Return On Ngwp And Ghgicontrasting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Net global warming potential and greenhouse gas intensity in a double-cropping cereal rotation as affected by nitrogen and straw management

et al. 2013

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“…Information on the effects of ISSM scenarios on GWP and greenhouse gas intensity (GHGI) of agricultural systems is limited in China (Ma et al, 2013;Liu et al, 2015). The annual rotation of summer rice-upland crop is a dominant cropping system in China.…”

Section: Zhang Et Al: Global Warming Potential and Greenhouse Gasmentioning

confidence: 99%

“…The annual rotation of summer rice-upland crop is a dominant cropping system in China. Previous studies were mainly focused on the initial influences of ISSM practices on CH 4 and N 2 O emissions, but did not account for the contributions of CO 2 emissions from Ei and Eo (Ma et al, 2013;. In this study, we evaluated GWP and GHGI of rice-wheat crop rotation managed under several scenarios of ISSM by taking CO 2 equivalents emissions from all sources and sinks into account for 3 years.…”

Section: Zhang Et Al: Global Warming Potential and Greenhouse Gasmentioning

confidence: 99%

Global warming potential and greenhouse gas intensity in rice agriculture driven by high yields and nitrogen use efficiency

Zhang

Liu

et al. 2016

Biogeosciences

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Abstract. Our understanding of how global warming potential (GWP) and greenhouse gas intensity (GHGI) is affected by management practices aimed at food security with respect to rice agriculture remains limited. In the present study, a field experiment was conducted in China to evaluate the effects of integrated soil-crop system management (ISSM) on GWP and GHGI after accounting for carbon dioxide (CO 2 ) equivalent emissions from all sources, including methane (CH 4 ) and nitrous oxide (N 2 O) emissions, agrochemical inputs and farm operations and sinks (i.e., soil organic carbon sequestration). The ISSM mainly consisted of different nitrogen (N) fertilization rates and split, manure, Zn and Na 2 SiO 3 fertilization and planting density for the improvement of rice yield and agronomic nitrogen use efficiency (NUE). Four ISSM scenarios consisting of different chemical N rates relative to the local farmers' practice (FP) rate were carried out, namely, ISSM-N1 (25 % reduction), ISSM-N2 (10 % reduction), ISSM-N3 (FP rate) and ISSM-N4 (25 % increase). The results showed that compared with the FP, the four ISSM scenarios significantly increased the rice yields by 10, 16, 28 and 41 % and the agronomic NUE by 75, 67, 35 and 40 %, respectively. In addition, compared with the FP, the ISSM-N1 and ISSM-N2 scenarios significantly reduced the GHGI by 14 and 18 %, respectively, despite similar GWPs. The ISSM-N3 and ISSM-N4 scenarios remarkably increased the GWP and GHGI by an average of 69 and 39 %, respectively. In conclusion, the ISSM strategies are promising for both food security and environmental protection, and the ISSM scenario of ISSM-N2 is the optimal strategy to realize high yields and high NUE together with low environmental impacts for this agricultural rice field.

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“…basal N) may benefit rice crop for higher yield and NUE. To our knowledge, the impacts of dense planting with less basal N are not well documented on rice yield, NUE and GHG emissions (Thakur et al, 2010;Zeng et al, 2012;Ma et al, 2013;Mahamud et al, 2013;Chen et al, 2014). China is the largest country of rice consumption and production in the world, and Chinese average N rate for rice was 168 kg ha -1 in 2010, about 69.0% higher than the world average (FAOSTAT, 2010;Heffer, 2013).…”

Section: Introductionmentioning

confidence: 99%

Effects of Dense Planting with Less Basal N Fertilization on Rice Yield, N Use Efficiency and Greenhouse Gas Emissions

Zhu¹,

Wang²,

Li³

et al. 2015

IJAB

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Rice cropping innovations for high yield with high N use efficiency (NUE) and low greenhouse gas (GHG) emissions are significant in ensuring food security and coping with climate change. The objective of this study was to investigate the comprehensive effects of dense planting with less basal N application (DR) on rice yield, NUE and GHG emissions. Field experiments were conducted at three sites in China: Shenyang, Danyang and Jinxian representing annual single rice cropping system, wheat-rice cropping system and double rice cropping system, respectively. Four planting densities with 25, 50, 75 and 100% higher each time correspondingly with about 25, 50, 75 and 100% less in basal N rate (i.e., DR1, DR2, DR3 and DR4 correspondingly) relative to traditional cropping for high yield (CK). Across three tested sites, the DR1 mode showed a large potential of NUE enhancement by 19.6% and GHG emissions mitigation by 12.2% at area-and yield-scaled with similar rice yield compared to the CK. However, further increase in planting density and decrease in basal N application caused a significant reduction in rice yield with a large increase in GHG emissions. Our results will provide important reference to rice cropping innovations for the integrated goals of food security, environmental health and climate change mitigation in China.

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Net global warming potential and greenhouse gas intensity of annual rice–wheat rotations with integrated soil–crop system management

Cited by 229 publications

References 60 publications

Net global warming potential and greenhouse gas intensity in a double-cropping cereal rotation as affected by nitrogen and straw management

Net global warming potential and greenhouse gas intensity in a double-cropping cereal rotation as affected by nitrogen and straw management

Global warming potential and greenhouse gas intensity in rice agriculture driven by high yields and nitrogen use efficiency

Effects of Dense Planting with Less Basal N Fertilization on Rice Yield, N Use Efficiency and Greenhouse Gas Emissions

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