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Acta Agronomica Sinica ›› 2020, Vol. 46 ›› Issue (8): 1258-1265.doi: 10.3724/SP.J.1006.2020.94164

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

The study of carbon budget on field-tobacco ecosystem

LIU Qing-Li1,JIANG Yu-Zhou1,ZOU Yan2,ZHANG Yun-Gui1,ZHANG Heng2,SHI Jun-Xiong2,LI Zhi-Hong1,*()   

  1. 1Institute of Agricultural Resource and Regional Planning, Chinese Academy of Agricultural Sciences/Key Laboratory of Ecological Environment and Tobacco Quality in Tobacco Industry, Beijing 100081, China
    2Guizhou Academy of Tobacco Science, Guiyang 550081, Guizhou, China
  • Received:2019-11-05 Accepted:2020-04-15 Online:2020-08-12 Published:2020-05-11
  • Contact: Zhi-Hong LI E-mail:lizhihong01@caas.ac.cn
  • Supported by:
    National Tobacco Monopoly Bureau project(110201402015);National Tobacco Monopoly Bureau project(110201901025[SJ-04]);Guizhou Branch of China Tobacco Corporation Project(201802)

Abstract:

The carbon balance of the agricultural ecosystem is of great significance for the assessment of the source and sink of the terrestrial ecosystem. In view of the particularity of the growth and management of flue-cured tobacco, the carbon budget of the field-tobacco ecosystem was studied in order to provide the basis for the improvement of tobacco field management and the estimation of agricultural carbon sink. In this study, the carbon budget was observed with single application of chemical fertilizer using the long-term positioning test station for three years from 2015 to 2017. The results showed that the average cumulative biomass of flue-cured tobacco, the average carbon content of tobacco plant, and the cumulative carbon sequestration were (5832.10 ± 537.32) kg hm-2, (42.14 ± 0.05)%, and (2459.25 ± 233.78) kg hm-2, respectively. The ratio of root carbon to plant carbon was higher, with an average of 24.94%. The wet deposition carbon and the dry deposition carbon were 115.32 kg hm-2 and 6.54 kg hm-2 respectively, both accounting for 20.01% of root carbon amount. The total carbon output in growing season was 2464.98 kg hm-2, in which the CO2 emission expenditure accounts for 98.99%, the runoff carbon expenditure 0.76%, and the leaching carbon accounts for 0.25%. The flue-cured tobacco ecosystem was a weak carbon sink to the atmosphere, with a carbon sink of 116.13 kg hm-2. The total amount of carbon sequestration in flue-cured tobacco was relatively lower, whereas its root system had a relatively higher contribution to soil carbon.

Key words: flue-cured tobacco, carbon budget, carbon sink/source, carbon emission, atmospheric deposition

Fig. 1

Temperature and precipitation variation of long-term position test station from 2015 to 2017 in Longgang"

Fig. 2

Combined sampling box for measuring greenhouse gas emissions in high stem crop ecosystem 1: stainless steel wall of top-box; 2: air pressure balance pipe; 3: sampling pipe and three-way valve; 4: temperature sensor; 5: thermal insulation material on the outer wall; 6: stainless steel platform; 7: elastic sealing material; 8: elastic sealing material; 9: soil surface; 10: stainless steel base wall; 11: a plant."

Fig. 3

Device of soil leaching solution collection from soil"

Fig. 4

Carbon content of different parts in flue-cured tobacco"

Fig. 5

Carbon sequestration and its distribution in flue-cured tobacco"

Table 1

Summary of carbon deposition in the experimental area"

时间
Time
湿沉降Wet deposition 干沉降Dry deposition 总计
Total
(kg hm-2)
降雨量
Rainfall
(mm)
碳浓度
Concentration
(mg L-1)
沉降碳
Carbon
(kg hm-2)
灰尘
Dust
(kg hm-2)
碳浓度
Concentration
(mg g-1)
沉降碳
Carbon
(kg hm-2)
5月May 129.10 7.65 9.88 91.56 18.24 1.67 11.55
6月June 213.90 17.38 37.17 51.87 11.45 0.59 37.76
7月July 146.00 29.26 42.72 26.87 20.72 0.56 43.27
8月August 169.90 8.88 15.08 382.17 3.91 1.49 16.58
9月September 10.70 97.91 10.48 40.95 54.30 2.22 12.70
全年Whole year 1154.10 17.21 198.64 1444.00 21.72 31.37 230.00

Fig. 6

Dynamics variation of CO2 emission in field-tobacco ecosystem"

Fig. 7

Amount of CO2 emission in different years"

Fig. 8

Pathways of carbon output and its contribution in field- tobacco ecosystem"

Fig. 9

Carbon balance in field-tobacco ecosystem"

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