Ecosystem service tradeoff between traditional and modern agriculture： a case study in Congjiang County, Guizhou Province, China

Besides crops, agriculture supplies all three major categories of ecosystem services （ES）. However, agriculture also supplies an array of ecosystem dis-services （EDS） that may harm other ecosystems. The flows of ES and EDS are directly dependent on the management of agricultural ecosystems. The traditional method of Chinese agriculture, which supports sustainable agriculture, has been proven to increase ES and reduce EDS. However, there is a lack of a detailed understanding of the ES and EDS associated with traditional agriculture, and also of differences between traditional and modem agriculture. In this study, an investigation was conducted on the ecosystem services （ES） and ecosystem dis-services （EDS） of traditional and modem agriculture in Congjiang County, Guizhou Province, China. Afterwards, the economic values of ES and EDS were quantified experimentally and calculated based on the market price. The results show that： the net economic value of traditional rice-fish agriculture was 3.31 x 104 CNY.haI （6.83 CNY = 1 USD as of July, 2009） and that of rice monoculture was 1.99 x 104 CNY.ha ~. Significant differences existed between traditional rice-fish and rice monoculture fields for their economic values of some ES or EDS. A benefit and cost analysis （BCA） model was used to adjust the conflict between the economic income and environmental loss from traditional and modem agricul- ture. The BCA model not only calculates the net income but also monetizes the EDS of the agricultural systems. The results showed that the net income of rice-fish agriculture was 1.94x 104CNY.ha-1 higher than that of rice monoculture. However, the benefit to cost ratio （BCR） of rice-fish agriculture was lower than that of rice monoculture, indicating that the traditional agricultural model was not the most optimized choice for farmers. The value of the rice-fish agriculture was much higher than that of the rice monoculture. Thus, when considering the benefits that rice-fish agriculture contributes to the large- scale society, these agricultural methods needs to be utilized. Furthermore, the labor opportunity costs were calculated and the comprehensive value of rice mono- culture was negative. Finally, the compensation standard was calculated based on the comprehensive benefit analysis. The lowest level was 1.09×103 CNY.ha-1, and the highest level was 1.21 × 104 CNY.ha-1.