Sains Malaysiana 48(7)(2019): 1347–1355

http://dx.doi.org/10.17576/jsm-2019-4807-04

Different Responses of Greenhouse Gas Emissions to Straw Application at Different Seasons in Northeast China

(Tindak Balas Berbeza Pelepasan Gas Rumah Hijau untuk Penggunaan Jerami pada Musim yang Berbeza di Timur Laut China)

SHUANG LIANG¹ & HAO ZHANG²*

¹Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, Changchun 130118, China

²Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China

Diserahkan: 2 Januari 2019/Diterima: 3 April 2019

ABSTRACT

Although straw return plays a role in regulating greenhouse gas (GHG) emissions from rice paddy fields, little quantitative information is available on the extent at different periods. In this study, gas samples were collected during the rice growing period from an in-situ experiment comprising three treatments: no straw return (CK); straw return in the autumn (SR-A), and; straw return in the spring (SR-S). The results showed that SR-A and SR-S enhanced CO2 and CH4 emissions, but reduced N2O emissions during the growing period. The total cumulative CO2 emissions over the entire growing period in the SR-S treatment reached 20,383.72 kg ha−1, significantly higher than those of the SR-A and CK treatments. CH4 emissions for all the growing periods were in the order SR-S > SR-A > CK. The CK and SR-S treatments released the most and least N2O during the different periods, respectively. The global warming potential (GWP) of CH4 released by the SR-S, SR-A and CK treatments reached 26,055.37 kg CO2 eq. ha−1, 12,643.27 kg CO2 eq. ha−1, and 9,237.55 kg CO2 eq. ha−1, accounting for 55.80%, 40.35%, and 35.99% of the total GWP, respectively. These results can contribute to management of agricultural GHGs in this region.

Keywords: Greenhouse gas; growing period; paddy field; straw return

ABSTRAK

Hasil jerami telah memainkan peranan dalam mengawal selia pelepasan gas rumah hijau (GHG) daripada sawah padi, walau bagaimanapun, hanya sedikit maklumat kuantitatif boleh didapati untuk tempoh masa berlainan. Dalam kajian ini, sampel gas telah diambil dalam tempoh pertumbuhan semasa kajian in situ yang terdiri daripada tiga rawatan: tiada hasil jerami (CK); hasil jerami pada musim luruh (SR-A) dan hasil jerami pada musim bunga (SR-S). Hasil kajian menunjukkan bahawa SR-A dan SR-S meningkatkan pelepasan CO2 dan CH4, tetapi pengurangan pelepasan N2O dalam tempoh pertumbuhan. Jumlah keseluruhan pelepasan CO2 yang terkumpul sepanjang tempoh pertumbuhan keseluruhan dalam rawatan SR-S ialah 20,383.72 kg ha−1, jauh lebih tinggi berbanding rawatan SR-A dan CK. Pelepasan CH4 untuk semua tempoh pertumbuhan adalah seperti berikut SR-S > SR-A > CK. Perawatan CK dan SR-S mengeluarkan N2O paling banyak dan paling sedikit dalam tempoh ini. Potensi pemanasan global (GWP) CH4 yang dikeluarkan oleh SR-S, SR-A dan CK semasa rawatan mencapai 26,055.37 kg CO2 eq. ha−1, 12,643.27 kg CO2 eq. ha −1 dan 9,237.55 kg CO2 eq. ha−1 merangkumi 55,80%, 40.35% dan 35.99% jumlah GWP. Keputusan ini boleh menyumbang kepada pengurusan pertanian GHG di rantau ini.

Kata kunci: Gas rumah hijau; hasil jerami; sawah padi; tempoh pembesaran

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*Pengarang untuk surat-menyurat; email: zhanghao@iga.ac.cn