排水对若尔盖高寒沼泽CO<sub>2</sub>和CH<sub>4</sub>排放通量的影响

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Abstract

The CO₂ and CH₄ emission fluxes in the Zoigê Plateau Marsh were monitored by using the dark static chamber and Fast Greenhouse Gas Analyzer at three typical sampling sites (natural marsh, drainage marshes in the 1990s and 1970s) from May to October in 2014. The results showed that the drainage increased the soil temperature (5, 20 and 45cm depth) and reduced the water level. The ecosystem CO₂ emission fluxes of the drained marshes in 1990s[(680±329) mg CO₂/(m²·h)] and 1970s[(973±234) mg CO₂/(m²·h)] were 200% and 330% higher than that in the natural marsh. While, the ecosystem CH₄ emission fluxes of the drained marshes in 1990s[(0.78±0.52) mg CH₄/(m²·h)] and 1970s[(-0.01±0.02) mg CH₄/(m²·h)] were 90% and 100% lower than that in the natural marsh, respectively. Taking into consideration of both CO₂ and CH₄ emission fluxes, the ecosystem carbon (C) emission fluxes of the drained marshes in 1990s[(186±89) mg C/(m²·h)] and 1970s[(265±64) mg C/(m²·h)] were 180% and 300% higher than that in the natural marsh. Besides, there was a significant positive correlation between the ecosystem CO₂ emission fluxes and the soil temperature of 5cm depth in the three typical sampling sites. Whereas, there was an obvious negative correlation between the ecosystem CO₂ emission flux and the water level in the 1990s drained marsh. In addition, the ecosystem CH₄ emission flux in the natural marsh was notably positively correlated with the soil temperatures at 5, 20 and 45cm depth. However, the ecosystem CH₄ emission flux in the 1970s drained marsh was remarkably negatively correlated with the soil temperatures at 20 and 45cm depth. Meanwhile, we also found that there was a significant positive relation between the ecosystem CH₄ emission flux in the 1990s drained marsh and the water level. This research suggested that the marsh drainage could significantly increase the ecosystem C emission flux from the soil into the atmosphere in the Zoigê Plateau Marsh, subsequently decrease the soil C sink function, and further enhance the regional climate warming.

Key words： drainage CO₂ emission flux CH₄ emission flux greenhouse gas Zoigê Plateau Marsh

Received: 01 December 2018

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	ZHOU Wen-chang
	CUI Li-juan
	WANG Yi-fei
	LI Wei
	KANG Xiao-ming

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ZHOU Wen-chang,CUI Li-juan,WANG Yi-fei等. Effects of drainage on the CO₂ and CH₄ emission fluxes in the Zoigê Plateau Marsh[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(7): 3040-3047.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I7/3040

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