Spatial characteristics of soil conservation service and its impact factors in Hainan Island Ecological and Evolutionary Studies on Sagittaria (Alismataceae) Spatiotemporal variation of interacting relationships among multiple provisioning and regulating services of Tibet grassland ecosystem Resource allocation among sexual, clonal reproduction and vegetative growth of two Potamogeton species and their hybrid: adaptability of the hybrid in relation to its parents Ecosystem services valuation and its regulation in Baiyangdian baisn: Based on InVEST model