Abstract
Groundwater dynamics and water budget characteristics of plain farmland are studied in the Xin-Xing-Yuan Agricultural Experiment Site of 6.8 km2 in Hubei Province of China, to analyze complex relations of inflow and outflow and the effects of agricultural activities. Groundwater level data is collected by two year (1993-1994) field monitoring, and its changes in time and space are discussed. Analyses of water budgets of daily, monthly and annual periods are implemented for sections with different crop and cultivation style. Monthly groundwater change and net outflow (drainage or irrigation) have no clear patterns because of changeable rainfall and artificial management activity. And monthly budgets differ between lower section of rice field and higher section of vegetable field. However, annual water budgets show a similar pattern that groundwater storage loses a little and water drainage behaves as the main outflow, which is determined by requirements of farm management. Furthermore irrigation-drainage option is proposed to approach upon more efficient water management in the lowland farms.
