Seasonal variations in water uptake of summer maize under different fertilization treatments: A case study using stable isotopes in Beijing, China

Ying Ma1, Xianfang Song2, Ningxia Sun3, Lihu Yang1 and Baozhong Zhang4, (1)IGSNRR Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing, China, (2)CAS Chinese Academy of Sciences, Beijng, China, (3)China University of Geosciences, Beijing, China, (4)China Institute of Water Resources and Hydropower Research, Beijing, China