Study on ecological purification system of tidal-flow paddy wetland based on multifunctional coupling

doi:10.3969/j.issn.1000-5641.2024.01.007

Abstract

Abstract:

In this study, a pilot-scale tidal-flow paddy wetland system based on multifunctional coupling was constructed to treat land-based aquaculture tailwater of Macrobrachium rosenbergii. This study explored the purification ability, CH₄ emissions, arthropod diversity, and comprehensive benefits of the tidal-flow paddy wetland system to provide a scientific basis for the application of this system. The results showed that the tidal-flow paddy wetland system could effectively purify land-based aquaculture tailwater. The removal capacities of dissolved inorganic nitrogen, total nitrogen, dissolved inorganic phosphorus, and total phosphorus were approximately 54.3%, 44.9%, 42.9%, and 43.0%, respectively. Simultaneously, the system had no negative impact on the external environment and indirectly purifies river water. Compared with conventional paddy fields, the tidal-flow paddy wetland system reduced CO₂ and CH₄ emissions by 5.4% and 92.5%, respectively. Compared to conventional paddy fields during the flooding period, the abundance of the mcrA gene in the tidal-flow paddy wetland decreased by 82.3%. Moreover, the tidal-flow paddy wetland system improved biodiversity and natural enemy abundance/pest abundance, inhibited pest outbreaks, supported more species, and increased comprehensive benefits compared to the control.

Key words: tidal-flow, paddy wetland, greenhouse gas, arthropod diversity, water purification

CLC Number:

X522

Hongshuo ZOU, Min FU, Mengdie XIAO, Shiwen SHENG, Ping XU, Xuechu CHEN. Study on ecological purification system of tidal-flow paddy wetland based on multifunctional coupling[J]. Journal of East China Normal University(Natural Science), 2024, 2024(1): 58-67.

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湿地类型	功能团	丰富度/种	多度/ (只·m^–2)
潮汐流稻田湿地	天敌	10	3.7
	害虫	4	3.4
	中性昆虫	4	3.6
	总计	18	10.6
	天敌/害虫	2.5	1.1
常规稻田	天敌	6	10.8
	害虫	2	182.1
	中性昆虫	6	2.1
	总计	14	194.9
	天敌/害虫	3	0.1