Jiangsu Research Base of Rural Development and Land Policy, Nanjing Agricultural University, Nanjing 210095, P.R.China;
Institute for Natural Resource Conservation, Department of Ecosystem Management, University of Kiel, Kiel D-24118, Germany;
Institute for Natural Resource Conservation, Department of Ecosystem Management, University of Kiel, Kiel D-24118, Germany;
Jiangsu Research Base of Rural Development and Land Policy, Nanjing Agricultural University, Nanjing 210095, P.R.China;
Institute for Natural Resource Conservation, Department of Ecosystem Management, University of Kiel, Kiel D-24118, Germany;