兴国县低丘侵蚀紫色砂页岩开发利用与治理的研究之二──生态系统重建后土壤侵蚀和物理性状的变化

A STUDY ON THE DEVELOPMENT,UTILIZATION AND CONSERVATION OF THE ER0DED LOW HILL PURPLE STONE AREA IN XINGGUO COUNTY──the changes of soil erosion and physical properties after the re-establish-ment of the ecosystem

通过人工爆破成土和建立生态系统等一系列技术措施，跳跃了土壤形成的自然过程，在裸露的低丘紫色砂页岩上人工形成了５０～１００ｃｍ厚的土层，因地制宜地建立了人工复合生态系统。由于反坡水平梯他的建立、人工植被的保护以及精细的耕作管理措施，生态系统内的土壤侵蚀从根本上得到了控制，土壤物理性状不断改善，土壤进行顺向发育，主要表现为：土壤颗粒中的粗骨成份很快减少，而细土物质迅速增加；土壤容重显著下降；土镶的孔隙性状和持水状况极显著改善。

This paper states that soil of 50～100 cm depth can be formed directly on the surface ofthe eroded low hill purple stone skipping the natural soil formatiom process,and man-mademixed ecosystem can be set up according to the conditions of the locality with a series of tech-niques such as explosion to form soil and re-establishment of ecosystem. Owing to the build-ing up of the level farmland with reverse slope ,the protection of the vegetation and carefulcultivation,soil erosion in the ecosystem is governed almost completely,and soil physicalproperties are improved continuously. The reduching of the broader fractions of soil particals,the quick increasing of the finer ones,the remarkable increasing of the soil bulk density, andthe obrious improvement of the soil pororsity and moisture capacity show that soil is develop-ing in the favourable derection.