[Interactive relations between agroecosystem and economic system in Loess Hilly Region--a case of Zhifanggou small watershed, Ansai County].

Based on the investigation data in 1938-2007 and by using the evaluation method of ecosystem service value and the ecological footprint theory, the ecosystem service value and ecological footprint in Zhifanggou watershed of Loess Hilly Region were calculated, with the interactive relations between agroecosystem and economic system in the watershed analyzed. From 1938 to 2007, Zhifanggou watershed experienced three development stages, i.e., ecological environment destruction with backwardness of economy (1938-1975), eco-environment restoration with rapid development of economy (1975-2000), and well-maintained ecological environment with stable growth of economy (2000-2007). The interactive relations of the eco-economic systems manifested as ecological deterioration, eco-economic adaptive regulation, and eco-economic benign interaction.