4,水稻產量," /> 福彩3d开奖结果查询

中國農業科學 ?? 2019, Vol. 52 ?? Issue (12): 2101-2113.doi: 10.3864/j.issn.0578-1752.2019.12.008

? 土壤肥料·節水灌溉·農業生態環境 ? 上一篇    下一篇

再生稻和雙季稻田CH4排放對比研究

張浪,徐華勤,李林林,陳元偉,鄭華斌,唐啟源(),唐劍武   

  1. 湖南農業大學農學院,長沙 410128
  • 收稿日期:2018-12-18 接受日期:2019-03-04 出版日期:2019-06-16 發布日期:2019-06-22
  • 通訊作者: 唐啟源 E-mail:[email protected]
  • 作者簡介:張浪,E-mail: [email protected]
  • 基金資助:
    國家水稻產業體系項目(CARS-01-26);國家重點研發計劃項目(2017YFD0300409);國家留學基金委項目(CSC201808430213);2017年大學生科技創新基金(2017ZK13)

Comparative Study on CH4Emission from Ratoon Rice and Double-Cropping Rice Fields

ZHANG Lang,XU HuaQin,LI LinLin,CHEN YuanWei,ZHENG HuaBing,TANG QiYuan(),TANG JianWu   

  1. College of Agronomy, Hunan Agricultural University, Changsha 410128
  • Received:2018-12-18 Accepted:2019-03-04 Online:2019-06-16 Published:2019-06-22
  • Contact: QiYuan TANG E-mail:[email protected]

摘要:

【目的】 為了探索生態可持續的稻作模式,對比研究了長江中下游地區雙季稻和再生稻稻作模式的產量潛力和CH4排放特征,以此為選取綠色、生態經濟可持續的稻作模式提供科學依據。【方法】 于2017—2018年依托湖南省益陽市大通湖區宏碩生態農業農機合作社科研基地,設置了雙季稻和再生稻2種模式,對比分析了產量潛力、稻田生育期間CH4排放動態和稻田生態系統CH4季節性累積排放規律以及評估了單位產量稻田CH4排放。【結果】 試驗期間,從產量方面來看,雙季稻早稻產量為7.37 t·hm -2,再生稻頭季產量為8.84 t·hm -2,頭季相比早稻增產19.95%。雙季稻晚稻產量為6.82 t·hm -2,再生稻再生季產量為3.39 t·hm -2,再生季相比晚稻減產50.29%。綜合兩季,雙季稻總產量為14.19 t·hm -2,再生稻總產量為12.22 t·hm -2;從生育期間CH4排放動態來看,雙季稻在分蘗期和齊穗期左右排放較強峰值,再生稻除了在分蘗期和齊穗期有較強的排放以外,其在施用促芽肥時也出現了小峰值。但總體雙季稻的排放范圍(- 0.06—1.30 μmol·m -2·s -1)要高于再生稻的排放范圍(- 0.01—0.70 μmol·m -2·s -1);從稻田CH4季節性累積排放來看,雙季稻CH4累積排放要高于再生稻。再生稻頭季累積排放范圍在23.90—266.59kg·hm -2,再生季累積排放范圍在0.00—46.14 kg·hm -2。雙季稻早稻季節累積排放范圍在為35.57—251.29kg·hm -2,晚稻季節累積排放范圍在為10.74—321.59 kg·hm -2。雙季稻CH4季節累積排放A-B(兩葉一心至分蘗后期)段>B-C(分蘗后期至齊穗期)段>C-D(齊穗期至成熟期)段,且全生育期雙季稻累積排放達922.35 kg·hm -2。再生稻CH4累積排放B-C段>A-B段>C-D段,且全生育期CH4累積排放為609.74 kg·hm -2,即相比對照雙季稻,再生稻CH4累積排放降低了33.89%;最后通過評估單位產量CH4排放可知,早稻單位產量CH4排放為0.069 kg·kg -1,頭季單位產量CH4排放為0.062 kg·kg -1,頭季相比早稻減少了10.14%;晚稻單位產量CH4排放為0.061 kg·kg -1,再生季單位產量CH4排放為0.018 kg·kg -1,再生季相比晚稻降低了70.49%。綜合兩季,雙季稻單位產量CH4排放為0.065 kg·kg -1,再生稻單位產量CH4排放為0.050 kg·kg -1,再生稻相比雙季稻降低了23.08%。 【結論】 從單位產量下CH4排放角度來看,在長江中下游雙季稻的主產區擴大種植再生稻是為良策。

關鍵詞: 再生稻, 雙季稻, CH4, 水稻產量

Abstract:

【Objective】In order to explore the ecologically sustainable rice planting model, the yield potential and CH4 emission characteristics of traditional double-cropping rice and emerging ratoon rice in the middle and lower reaches of the Yangtze River were compared, so as to provide a scientific basis for selecting a green and ecologically sustainable rice farming model.【Method】In 2017-2018, relying on the research base of Hongshuo Eco-Agricultural Machinery Company in Datonghu District, Yiyang City, Hunan Province, two models of double-cropping rice and ratoon rice were set up, and the yield potential, CH4 emission dynamics and CH4 seasonal cumulative emission were compared and analyzed to evaluate unit yield CH4 emissions from paddy fields.【Result】During the experiment, from the aspect of yield, the yield of early rice was 7.37 t·hm -2, and the yield of main crop was 8.84 t·hm -2. Main crop yield increased by 19.95% compared with early rice; the late rice yield was 6.82 t·hm -2, and the ratoon crop was 3.39 t·hm -2. Compared with the late rice, the ratoon crop yield was reduced by 50.29%. In the two crops, the total yield of double-cropping rice was 14.19 t·hm -2, and the total yield of ratoon rice was 12.22 t·hm -2; in terms of CH4 emission dynamics, double-cropping rice was highly polluted in the tillering and full-heading. In addition to strong emissions in the tillering and full-heading, the ratoon rice also appeared small peak when applying budding fertilizer. However, the emission range of the overall double-cropping rice (-0.06 to 1.30 μmol·m -2·s -1) was higher than that of the ratoon rice (- 0.01 to 0.70 μmol·m -2·s -1); from the seasonal cumulative emission of CH4 in paddy fields, the cumulative emission of CH4 in double-cropping rice was higher than that in ratoon rice. The cumulative emission range of main crop was from 23.90 to 266.59 kg·hm -2, and the ratoon crop was from 0 to 4.61 kg·hm -2. The cumulative emission range of early rice was from 35.57 to 251.29 kg·hm -2, and the late rice was from10.74 to 321.59 kg·hm -2. CH4 seasonal cumulative emissions of double-cropping rice showed: A-B stage (two leaves-one heart to late-tillering) > B-C stage (late-tillering to full-heading) > C-D stage (full-heading to mature), and cumulative emissions of double-cropping rice during the whole growth period was up to 922.35 kg·hm -2. The cumulative emission of methane from ratoon rice was B-C stage>A-B stage>C-D stage, and the cumulative emission of methane during the whole growth period was 609.74 kg·hm -2. Compared with the double-cropping rice control, ratoon rice methane cumulative emissions decreased by 33.89%. Finally, by evaluating the unit yield methane emissions, the methane emission per unit yield of early rice was0.069 kg·kg -1, and the methane emission per unit yield of main crop was 0.062 kg·kg -1, which was 10.14% lower than that of early rice. The methane emission per unit yield of late rice was 0.061 kg·kg -1, the methane emission per unit of ratoon crop was0.018 kg·kg -1, and the ratoon crop was reduced by 70.49%, compared with the late rice. In the two crops, the methane emission per unit yield of double-cropping rice was 0.065 kg·kg -1, and the methane emission per unit yield of ratoon rice was 0.050 kg·kg -1, which was 23.08% lower than that of double-cropping rice.【Conclusion】Therefore, in terms of methane emissions per unit yield, expanding the cultivation of ratoon rice was a good strategy in the main producing areas of the double-cropping rice in the middle and lower reaches of the Yangtze River.

Key words: ratoon rice, double-cropping rice, CH4, rice yield

福利彩票3d开奖结果