兴国县低丘侵蚀紫色砂页岩开发利用与治理的研究之三──生态重建后土壤肥力的变化

A STUDY ON THE DEVELOPMENT,UTILIZATION AND CONSERVATION OF THE ERODED LOW HILL PURPLE STONE AREA XINGGUO COUNTY ──Change of soil fertility after the re-establishment of the ecosystem

通过爆破成土和建立人工生态系统等一系列技术措施，跳越了土壤形成的自然过程和生态的进化过程，直接在裸露的低丘紫色砂页岩上因地制宜地建立了农－草和果－（农）－草人工复合生态系统。本文的研究表明，在人工生态系统重建之后，由于加入大量有机物和农家肥以及精细的耕作管理，土壤的肥力不断提高。主要表现在：（１）极显著提高了土壤有机质含量，其平均值由刚成土时的３．１１２ｇ／ｋｇ增加到３年后的５．７６４ｇ／ｋｇ。（２）土壤全氮量显著增加。（３）土壤中的有机磷、土壤水解性氮和土壤速效磷的含量极显著增加；（４）土壤各种微生物的数量都表现出逐年显著增加。

Man-made crops-grasses and fruit trees──(crops)──grasses mixed ecosystems wereestablished on the bare surface of the purple stone,skipping the natural soil formation processand ecological evolution process with a series of techniques such as explosion to form soil andre-establishment of ecosystem. The results of the study indicated that the soil fertility hadbeen improved greatly by adding large amount of organic fertilizers and careful cuItivation af-ter the rebuilding of the ecosystem, showing that :1) the soil organic matter had increasedvery remarkably which went up from 3.112g/kg when the soil formed to 5.76 g/kg 3 yearslater,2)soil total nitrogen had increased remarkably, 3)soil organic phosphors, availabIe ni-trogen and phosphors had increased very remarkably,4)the amount of various soil micro-or-ganisms had increased remarkably year by year.