摘要
为给岩溶区水土保持、农业生产、植被恢复与生态重建提供参考,以桂林会仙典型岩溶洼地和坡地两种不同地貌部位为研究点,以石灰岩地质背景条件下的基岩—土壤—土壤水—植物体系统中的元素含量和组成特征为研究对象,探讨不同地貌部位条件下元素的基本特点、制约因素和变化趋势。结果表明,在岩溶动力条件的驱动下,岩溶区形成了显著的偏碱环境特征;洼地和坡地土壤剖面元素和土壤水含量特征差异明显,植物对土壤元素的生物吸收系数比较低,属于受氮限制的类型;坡地部位的偏碱富钙和水分胁迫程度更为严重;同一石灰岩地质背景条件下不同地貌部位岩溶系统元素迁移特征差别显著。
To provide a reference for soil and water conservation,agricultural production,vegetation restoration and ecological reconstruction in karst area,we studied the content and composition characteristics of elements in the rock-soil-soil water-plant system in typical karst depression and slope land in Huixian county,Guilin,and made a comparative analysis on the basic characteristics,restricting factors and variation trend of elements in these two different landforms. The results showed that karst area was a typical alkaline environment in karst dynamic conditions; the soil profile elements and soil moisture of karst depression were significantly different from those of slope land; plants＇biological absorption coefficient of soil elements was relatively low,was characterized by nitrogen limitation; the alkaline and calcium-rich characteristic of slope land was much more obvious than that of karst depression; and in the same limestone geological background,the element migration characteristic of karst depression and slope land greatly differed from each other.
出处
《中国农学通报》
CSCD
北大核心
2010年第20期349-352,共4页
Chinese Agricultural Science Bulletin
基金
国家"十一五"科技支撑计划项目(2006BAC01A10)
国家自然科学青年基金项目(40902074)
中国地质科学院岩溶地质研究所基本科研业务专项项目(2009006)
中国地质科学院岩溶与石漠化治理重点开放实验室专项资金项目(K200901)共同资助
关键词
石灰岩
岩溶系统
洼地
坡地
元素迁移
limestone； karst system； depression； slope land； element migration；
