The influence of aspect and vegetation on seasonal changes in erosion under rainfall simulation on a clay soil in Spain
The influence of aspect and vegetation on seasonal changes in erosion under rainfall simulation on a clay soil in Spain
复制标题
在模拟降雨条件下，地势和植被对西班牙粘土侵蚀季节性变化的影响
DOI：
10.4141/s97-060
复制
发表时间：
1998-05-01
影响因子：
1.7
通讯作者：
Cerda, A
中科院分区：
文献类型：
--
作者：
Cerda, A
通过对84个降雨模拟试验进行分析，研究了西班牙东南部不同坡度条件下土壤侵蚀的季节和空间变异性，试验强度为55 mm h（-1），历时1 h。坡面植被覆盖区和上部植被覆盖区的产沙量、径流量和侵蚀量较小，而坡面裸露区的径流量较大。在模拟降雨过程中，植被区的径流泥沙浓度随着时间的推移而下降，而裸露区的径流泥沙浓度则随着时间的推移而增加。两种表面类型的溶质释放随时间推移而减少。从季节上看，秋季径流泥沙含量最高，冬春两季径流泥沙含量降低，主要是由于易蚀性土壤的耗竭和植被的生长。当夏季径流量和侵蚀量很低时，泥沙浓度略有增加。季节变化的增加与径流和土壤流失率的增加相对应。
The seasonal and spatial variability of soil erosion under contrasting slope aspects in southeastern Spain was studied by performing and interpreting 84 rainfall simulation experiments conducted at an intensity of 55 mm h(-1) during 1 h. The vegetated soils on the north-facing slope and the upper afforested parts had negligible sediment yield, runoff and erosion, while the bare soils on the south-facing slope had very high runoff rates. Runoff sediment concentration decreased over time during simulated rainfall events on the vegetated areas while it increased on the bare ones. Solute release decreased over time on both surface types. Seasonally, runoff sediment concentration was highest in autumn, decreasing in winter and spring, due to the exhaustion of erodible soil and the vegetation growth. Sediment concentrations increased slightly in summer when runoff and erosion rates where very low. Increasing seasonal variability corresponded with increasing runoff and soil loss rates.