• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Soil moisture variations at different topographic domains and land use types in the semi-arid Loess Plateau, China
【24h】

Soil moisture variations at different topographic domains and land use types in the semi-arid Loess Plateau, China

机译：中国半干旱黄土高原不同地形域和土地利用类型的土壤水分变化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Soil moisture plays a fundamental role in eco-hydrological processes in the semi-arid Loess Plateau. Catchments on the Loess Plateau can be generally divided into the hillslope domain and gully domain. However, the soil moisture variations linked to topographic domains and land use types remain poorly understood. Therefore, in this study, differences in soil moisture among three typical land use types (forestland, native grassland, and farmland) were investigated and compared between the spatial domains of hillslope and gully in the Jiegou catchment on the semi-arid Loess Plateau of China. Additionally, the spatial variations in the soil moisture of the 0-100 cm layers were explored in both wet and dry periods to evaluate the seasonal effects of different spatial domains and land use types. The results showed that including gully soil moisture weakly increased the spatially averaged soil moisture in the catchment but obviously increased the variability during wet periods. In contrast, the spatial means decreased weakly while the variability obviously decreased during dry periods. Soil moisture in forestland was lower than that in native grassland and farmland at all spatial domains during both wet and dry periods. The results also indicated that surface soil moisture (0-10 cm) differs between spatial domains but not land use types, which mainly due to the differences of evapotranspiration on the two topographic domains. In contrast, deep soil moisture (80-100 cm) differs among land use types but not spatial domains, which because of the differences of root water uptake among land use types. In addition, slope aspect played a more important role than slope gradient and elevation in the distribution of soil moisture at the hillslope domain. This was because the slope aspect affected the ground temperature by receiving different solar radiation, and further affected the soil evaporation and vegetation transpiration. Therefore, the results of this study indicates that both topographic domains and land use types should be considered when attempting to characterize soil moisture variability or modelling surface hydrological processes at catchment scale in heavily gullied regions.
机译：土壤水分在半干旱黄土高原的生态水文过程中起着基本作用。黄土高原上的集水区通常分为山坡域和沟壑域。然而，与地形结构域和土地使用类型相关的土壤水分变化仍然很差。因此，在本研究中，研究了三种典型的土地使用类型（林地，原生草地和农田）的土壤水分的差异，并比较了山坡的空间域，沟壑区在中国半干旱黄土高原的杰沟集水区之间。另外，在潮湿和干燥期间探讨了0-100cm层的土壤水分的空间变化，以评估不同空间域和土地使用类型的季节性影响。结果表明，包括沟壑的土壤水分在集水区内的空间平均土壤水分疲软，但显然增加了潮湿时期的可变性。相反，空间装置弱，而在干燥期间的可变性明显减少。在潮湿和干燥时期，林地的土壤水分低于天然草地和土着草原和农田。结果还表明，空间域的表面土壤水分（0-10cm）不同，但不包括土地利用类型，这主要是由于蒸散在两个地形域上的蒸散量的差异。相比之下，土地利用（80-100厘米）不同的土地使用类型而不是空间域，这是由于土地使用类型的根水摄取差异。此外，坡面方面比山坡域下土壤水分分布的坡度梯度和高度发挥了更重要的作用。这是因为坡度方面通过接受不同的太阳辐射影响了地温，并进一步影响了土壤蒸发和植被蒸腾。因此，该研究的结果表明，在尝试在大量沟壑区的集水区表征土壤水分变异性或建模表面水文过程时，应考虑地形域和土地使用类型。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号