【摘要】 在重庆市有代表性的岩溶山地北碚、黔江、金佛山、巫山选择10种典型利用方式、26个样地,研究土地利用方式对处于岩溶脆弱生境核心部位的土壤质量性状的影响。结果显示四个研究地区不同土地利用系统中各养分指标间存在较大的变化,但变化规律并不一致。在较大区域内土地利用方式对岩溶山地土壤属性的影响不显著,而小区域内不同土地利用方式下土壤质量、有机质、全氮、全钾、全磷、速效氮、速效磷存在显著差异。土壤退化指数的计算结果表明,岩溶山地土壤质量与土地利用方式的关系复杂,存在区域差异性;同时人工造林改善土地质量状况需要较长时间的演替,简单的退耕还林很难使土壤质量得到恢复。更多还原

【Abstract】 This paper chooses the Karst mountain in Beibei, Jinfushan mountainsQianjiang county and Wushan county as the typical representation in Chongqing area, and chooses 10 typical land use patterns to study the effect of different land use patterns on soil quality properties which is the core of karst vulnerable ecoenvironmentWe draw conclusions as follows::firstly, there are major disparities among fertility indexes of various land use systems , but the change rules are not consistent in 4 studied areas Secondly, land use patterns have not a significant influence upon the soil’s properties in rather big district in karst mountains, and the soil contributes are affected by complex factorsBut the analysis of soil surface layer’s properties in Beibei karst mountain shows that there are significant difference among properties including soil bulk density, organic matter, total N, total K, total P and available N and P under different land utilizing patterns Thirdly, the results of soil degradation index reveal that the relationships between soil quality and utilization are complicated, and there are regional difference in these relationships, and it needs a rather long time’s evolving to improve the soils quality by afforetation and abandoning the slopeland’s cultivation simply makes the soil quality rehabilitate difficultly更多还原