7Meng QH,Fu BJ,Tang XP,Ren HC. Effects of land use on phosphorus loss in the hilly area of the Loess Plateau,China[J].Environmental Monitoring and Assessment,2008,(1/3):195-204.doi:10.1007/s10661-007-9826-8.
8Sai LN,Cai QG,Ding SW,Kwai CC Qin J. Effects of contour hedgerows on water and soil conservation,crop productivity and nutrient budget for slope farmland in the Three Gorges Region(TGR) ofChina[J].AgroForestry Systems,2008.179-291.
9Marini L,Fontana P,Klimek S,Battisti A Gaston KJ. Impact of farm size and topography on plant and insect diversity of managed grasslands in the Alps[J].Biological Conservation,2009.394-403.
