Loess Plateau is the major grain production in the Northwest of China. Poor nutrient and lack of water are the main factor that limiting the agricultural development. Chinese Academy of Sciences Changwu Agroecosystem National Field Research Station is one of the Chinese Ecosystem Research Network(CERN) that including 36 scientific research field station. Up to now, Changwu station has been monitoring nearly 30 years for long-term dynamic monitoring of meteorology, hydrology, soils, biological and agricultur...