5SHOMAR B H, MULLER G, YAHYA A. Occurrence of pesticides in groundwater and topsoil of the gaza strip [J]. Water Air Soil Poll, 2006, 171:237-251.
6LIN X G, YIN R, ZHANG H Y, et al. Changes of soil microbiological properties caused by land use changing from rice-wheat rotation to vegetable cultivation[ J]. En- viron Geochem Health, 2004, 26 : 119-128.
