Spatiotemporal heterogeneity and its formation causes of soil physical properties in karst peak-cluster depression area of northwest Guangxi, China. The correlations among arable land, settlement and karst rocky desertification-cases study based on typical peak-cluster depression Litter C ∶ N ∶ P ecological stoichiometry character of plant communities in typical Karst Peak-Cluster Depression Soil nutrient accumulation and its affecting factors during vegetation succession in karst peak-cluster depressions of South China. Spatiotemporal heterogeneity of topsoil nutrients in Karst Peak-Cluster depression area of Northwest Guangxi, China Soil urease activity during different vegetation successions in karst peak-cluster depression area of northwest Guangxi, China