摘要
为研究氮素的生物地球化学循环问题 ,通过对河北平原典型试验场贯穿包气带 18.5m钻孔剖面土样的物理性质、地球化学指标、有机质含量的测试和微生物的培养鉴定 ,发现土体的氮素、可溶盐含量 (TDS)、Cl-含量以及微生物细菌的变化随深度不呈简单的线性分布。经分析认为 ,剖面中的粘性土层是生物的活性层 ,在氮素转化过程中起主导作用 ;剖面中多种指标的变化与地质结构呈良好对应关系 ,反映环境演化的过程。同时表明 ,包气带存在着更多尚待提取的全球变化对比研究信息。
For the purpose of studying biogeochemical circulation of nitrogen element, a borehole 18.45 m in depth was drilled in the unsaturated soil zone of Zhengding experimental site. Sediment samples were collected along the section. Water physical properties and some geochemical indexes were analysed, and bacteriologic examination of the samples was conducted. It is found that the changes of nitrogen element and TDS and Cl - and bacteria of the samples are not simply in linear distribution with the increasing depth of the section. They correspond to geological configuration and indicate environmental evolution. Being sensitive to bacteria and called 'active layer',the clayey layer on the section plays a dominant role in nitrogen element transformation. The changes also indicate that there are many kinds of environmental evolution or global change information which remain to be drawn from the unsaturated zone.
出处
《地球学报》
EI
CAS
CSCD
北大核心
2001年第4期324-329,共6页
Acta Geoscientica Sinica
基金
国土资源部基础性研究项目第二课题 (编号 :95 0 1110 -0 2 )
国土资源部学科生长点"地下水微生态学研究"项目野外试验场研究成果之一
