内蒙古奈曼旗中部沙地土壤剖面特征的分析研究* |
| ------------------------------------------------------------------------------------------ |
| 出 版 社：中国沙漠 |
| 发表时间：200s1期 |
| 台 站：
奈曼沙漠化研究站
|
| 作 者：赵学勇 张铜会 常学礼 |
| 点 击 率：1295 |
| ------------------------------------------------------------------------------------------ |
| 关 键 字：null |
| 摘 要：通过对奈曼旗中部不同沙地土壤剖面特征和不同土壤层内有机质含量分布的分析发现：灌溉农田土壤具有多层结构，沙层与粘土层交错叠置。在灌溉农田土壤的八层土层中包括三层粘土层，两层细沙层和三层粉沙层，而且每层粘土层的厚度不小于１５厘米。旱作农田土壤虽然也具有八层结构，但是只有一层粘土，厚度只有八厘米。显然其保水保肥性不及灌溉农田土壤。撂荒地土壤只有三层，而且完全是沙层，保水保肥性能最差。粘土层的结构基本均为块状，沙层都为单粒结构。此外，撂荒地农田土壤层中不仅有CaCO3结核,而且植物根系有CaCO3根套，表现出了一定的草原土结构特征。灌溉农田土壤的有机质含量明显高于旱作农田和撂荒地的有机质含量。灌溉农田土壤０－３０厘米土层的有机质的含量约０。７１２g/cm3，旱作农田和撂荒地相应土壤层的有机质含量分别为０.４０３g/cm3和０.４２０g/cm3。同一土壤剖面的有机质含量随着深度的增加而减少。 |
| 关 键 字(英文)：Sandy land Soil profile Soil organic matter |
| 摘 要(英文)：Several soil profiles were observed in order to find the characteristics of sandy soil. Observation revealed that the profile of irrigated cropland has three layers of clay and five layers of sands overlaid. The soil profile of rainfed cropland includes eight layers, of which is only one layer of clay at the depth around 30cm, the rest were sand. There are three layers of sand in the profile of abandoned cropland. Comparing the differences of the three profiles, it is obvious that irrigated cropland has a capacity of holding water and nutrients higher than that of rainfed cropland and abandoned cropland. Measurement on soil organic matter revealed that irrigated cropland has an organic matter content of 0.712g/cm3 while the organic matter content of rainfed and abandoned cropland were 0.403 g/cm3 and 0.420 g/cm3, respectively. In the same profile, organic matter content decreased with the increase of soil depth. |
| ------------------------------------------------------------------------------------------ |
| null |
核心期刊论文目录