地下水位及有机质对洪湖地区土壤潜育化指标的影响
文献类型：学位论文
| 作者 | 向先富 |
| 学位类别 | 硕士 |
| 答辩日期 | 2007-06 |
| 授予单位 | 中国科学院测量与地球物理研究所 |
| 授予地点 | 武汉 |
| 导师 | 陈世俭 |
| 关键词 | 地下水位 有机质 潜育化指标 洪湖地区 |
| 学位专业 | 自然地理学 |
| 中文摘要 | 摘要潜育化土壤是平原湖区的主要低产土壤类型，过饱和的土壤水分和丰富的有机物质都是土壤潜育化现象产生的必要条件。本文以江汉平原四湖地区两种不同有机质含量水稻土为例，通过模拟土柱试验和培养试验，定量研究了地下水位和有机质含量改变对土壤潜育化指标的影响。也为进一步说明三峡工程水库调度改变坝下平原地区地下水位、进而对该区土壤潜育化产生潜在影响的程度提供依据。主要结论如下： 1、地下水位改变对两种有机质含量不同的土壤潜育化指标的影响有所不同。近200天的土柱试验表明，较高有机质含量土壤的潜育化指标受地下水位的影响很大，清泥层较快出现（10天左右），其位置与地下水位的高低相一致；而较低有机质含量土壤受影响较小，未出现明显的青泥层。 2、较低有机质含量土壤土柱表层添加1%有机物质（稻草粉）后，各层土壤潜育化指标受地下水位的影响明显增大，下层土壤的潜育化指标因地下水位不同而产生分异，但下层未形成明显的青泥层。 3、培养试验表明，有机质添加量改变对两种有机物质含量土壤的潜育化指标都有一定的影响，但对低有机质含量土壤的影响较大。当有机物质添加量超过3%以后，同一土壤的潜育化指标随有机质添加量的改变很小。 关键词：地下水位 有机质 潜育化指标 洪湖地区 |
| 英文摘要 | Abstract Gley soil is the major low-yield soil in plain-lake areas, and abundant organic matter and oversaturated with water in soils are the basic factors of soil gleization. Soil column simulation and organic matter incubation experiments were carried out to study quantitatively the effects of groundwater levels and organic matter on the gleization indices (Eh value, gross reducing substances, active reducing substances, Fe2+, Mn2+and pH) of two paddy soils in Honghu Region. And following conclusions can be drawn: 1. The changes of groundwater levels will have different effects on the gleization indices of soils with different organic matter content, the depth of groundwater level is significantly positively correlated with the Eh value and negatively correlated with the content of gross reducing substances, active reducing substances, Fe2+ and Mn2+content，and the soils with higher organic matter content may be more affected than those with lower organic matter content，but the effect of groundwater level changes on gleization indices is no more significant when the depth of groundwater level is over 30cm. 2. All soil layers in columns are significantly affected when organic matter (1% straw) was added to the topsoil, but it has different effect on different soil layer, and no gley horizon appears in lower layers. 3. The amount of organic matter added to soils have different effects on the gleization indices of soils with different organic matter content, and the soil with lower organic matter content are more significantly affected. But the effect of organic matter on soil gleization indices is no more significant when the mass fraction of organic matter added to soil is higher than 3% |
| 语种 | 中文 |
| 公开日期 | 2013-01-17 |
| 源URL | [http://ir.whigg.ac.cn//handle/342008/3693]  |
| 专题 | 测量与地球物理研究所_学生论文_学位论文 |
| 推荐引用方式 GB/T 7714 | 向先富. 地下水位及有机质对洪湖地区土壤潜育化指标的影响[D]. 武汉. 中国科学院测量与地球物理研究所. 2007. |
入库方式： OAI收割
来源：测量与地球物理研究所
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