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Position: Home > Articles > Human influences on the development of acid sulphate soils in the Pearl River (the Zhujiang) Delta. Pedosphere 1996,6 (1)

Human influences on the development of acid sulphate soils in the Pearl River (the Zhujiang) Delta.

作者：

Lin ChuXia;Lin CX

单位：

;School of Geography, University of New South Wales, Sydney, N.S.W. 2052, Australia.

关键词：

water management;oxidation pyrites paddy soils;polder soils;fish ponds;reclaimed land;deltas soil formation;fish farming;soil types chemical;acid sulfate soils;china

摘要：

The development of acid sulfate soils in the Pearl River Delta, China, has been generally limited in terms of their acid potential (pyrite content) and spatial extent. This is attributed to rapid delta progradation, resulting partially from increasing sediment yield caused by deforestation within the catchment and the empolderment in the estuarine embayment. The empolderment practice, accompanied by the clearance of mangroves, stops the upward growth of the pyritic layer and limits the vertical accretion of non-pyritic freshwater sediments over the pyritic estuarine sediments. The pyritic layer in such areas is frequently thin and shallow. Under forced leaching-recharge conditions of paddy rice cultivation the leaching of acid sulfate materials dominates leading to a net loss of pyrite oxidation products. Land excavation for fishpond farming accelerates pyrite oxidation due to the direct exposure to air of the pyritic sediments on the pond bunds. This acidification can intensify the environmentaldegradation of estuarine ecosystems.

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Human influences on the development of acid sulphate soils in the Pearl River (the Zhujiang) Delta.

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