Abstract
The traditional high bed-low ditch agroecosystem in the Pearl River Delta of South China was studied by setting up research sites on farms. The high bed-low ditch systems were used for sugarcane ( Saccharum officinarum), banana ( Musa paradisiaca and M. paradisiaca var. sapientum) and tangerine ( Citrus reticuluta var. tangerina) production. A rice ( Oryza sativa) field which was adjacent to these systems was chosen as a control. Through the measurement of the system input, output, production and decomposition, the analysis of the N, P, K content of the samples and the setting up of a nitrogen flow model, results showed that the high bed-low ditch system has positive effects on lowering the water table, promoting root growth, reducing soil erosion and nutrient loss, preserving organic matter in the ditch and increasing the internal cycling of nutrients. The effects of biogas digesting and animal husbandry on the sustainability of the high bed-low ditch system is discussed.
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