Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, Hunan, China.
J Sci Food Agric. 2012 Mar 30;92(5):1086-93. doi: 10.1002/jsfa.4591. Epub 2011 Aug 19.
Human migration from the karst area to the non-karst area is an important approach for the restoration of degraded karst ecosystems. However, the effects of human-induced land-use change on soil properties are still unclear. The objective of this study was to investigate the effects of land use and parent material on soil organic carbon (SOC) and total nitrogen (TN) at a depth of 0-15 cm in karst and non-karst areas in southwest China.
In the karst area, SOC and TN under different land uses decreased significantly in the order of secondary forestland > scrubland and abandoned farmland > farmland, commercial forestland and forage grassland. In the non-karst area, SOC and TN were the highest in scrubland and grassland, and were significantly higher than those in farmland and commercial forestland. Because of differences in parent material, SOC and TN were significantly higher in the karst area than those in the non-karst area.
Abandoned farmland had the potential to increase SOC and TN significantly but land reclamation and cultivation had the opposite effect. SOC and TN were higher but cultivation-induced losses occurred more rapidly in calcareous soils than in red soils, indicating that more attention is needed for soil productivity and land use management in the karst area.
人类从喀斯特地区向非喀斯特地区迁移是恢复退化喀斯特生态系统的重要途径。然而，人为土地利用变化对土壤性质的影响仍不清楚。本研究旨在调查土地利用和母质对中国西南喀斯特和非喀斯特地区 0-15 厘米深度土壤有机碳（SOC）和总氮（TN）的影响。
在喀斯特地区，不同土地利用方式下的 SOC 和 TN 按次生林地>灌丛和弃耕地>耕地、商业林地和牧草草地的顺序显著降低。在非喀斯特地区，灌丛和草地的 SOC 和 TN 最高，明显高于耕地和商业林地。由于母质的差异，喀斯特地区的 SOC 和 TN 明显高于非喀斯特地区。
弃耕地具有显著增加 SOC 和 TN 的潜力，但土地开垦和耕作则有相反的效果。在钙质土壤中，SOC 和 TN 较高，但耕作引起的损失较快，这表明在喀斯特地区需要更加注意土壤生产力和土地利用管理。
