Effect of Straw Residues in Combination with Reduced Fertilization Rate on Greenhouse Gas Emissions from a Vegetable Field

被引：2

作者：

Huang R. ^{[1
]}

Gao M. ^{[1
]}

Li J.-C. ^{[1
]}

Xu G.-X. ^{[1
]}

Lü S. ^{[1
]}

Luo M. ^{[1
]}

机构：

[1] College of Resources and Environment, Southwest University, Chongqing

来源：

Huanjing Kexue/Environmental Science | 2018年 / 39卷 / 10期

关键词：

Chemical fertilizer; Emission reduction; Global warming potential (GWP); Greenhouse gas; Straw;

D O I：

10.13227/j.hjkx.201802087

中图分类号：

学科分类号：

摘要：

Greenhouse gases mainly come from farmland soils. Re-spreading chaff (straw returning) is an effective ecological management in China. Quantitative analysis of straw residues together with reduced fertilization rates can provide a scientific basis for reducing greenhouse gas emissions. A field experiment with six different fertilizer amounts combined with straw residues was carried out in a vegetable field (lettuce-cabbage-chili rotation), including the control (CK), conventional fertilizing (F), straw returning with 100% conventional fertilizing (100FS), straw returning with 70% conventional fertilizing (70FS), straw returning with 60% conventional fertilizing (60FS),and straw returning with 50% conventional fertilizing (50FS). The dynamic characteristics and emission factors of CO 2 , CH 4 and N 2 O in the soil were analyzed using an in-situ, closed chamber, gas chromatography-based system, from November 2016 to September 2017. The results showed that the emission of CO 2 , CH 4 and N 2 O has seasonal variation characteristics. The peak value mainly occurred in April to August, and the gas emission peak would appear after fertilizing and irrigating. Compared with F treatment, straw returning with fertilizing treatments reduced the N 2 O emission fluxes, cumulative emission and emission factor, especially in the 100FS treatment. The N 2 O cumulative emission and emission factor was 60.76 kg•hm -2 , 0.138 kg•kg -1 (N 2 O-N/N) respectively in 100FS treatment during planting chili was more than that during planting lettuce and cabbage. Moreover, straw returning with reducing conventional fertilizing could reduce the N 2 O emission factor compared with 100FS treatment. The CO 2 emission fluxes 55.28-1 831.62 [mg•(m 2 •h) -1 ] and cumulative emission (7 502.13-25 988.55 kg•hm -2 ) in 70FS treatment were lower than that in CK and F treatments, while other treatments increased the CO 2 emission fluxes and cumulative emission, especially in 60FS and 50FS treatments. During planting lettuce and cabbage, the CH 4 cumulative emission mainly showed negative values in treatments except for CK, indicating that soil could adsorb CH 4 . Moreover, straw returning with 30%-50% conventional fertilizing treatment could reduce CH 4 emission fluxes and cumulative emission during planting chili, but increased in 100FS. Compared with CK and F treatment, generally, straw retuning with conventional fertilizing could significantly increase the global warming potential (GWP) in the study, except for 70FS treatment. 70FS could reduce the CO 2 , CH 4 emission and the GWP of greenhouse gases, but could not significantly affect N 2 O emission reduction. © 2018, Science Press. All right reserved.

引用

页码：4694 / 4704

页数：10

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