Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.catena.2018.05.003 |
Interrill erodibility in relation to aggregate size class in a semi-arid soil under simulated rainfalls | |
Vaezi, Ali Reza1; Eslami, Seyedeh Fatemeh1; Keesstra, Saskia2 | |
通讯作者 | Vaezi, Ali Reza |
来源期刊 | CATENA |
ISSN | 0341-8162 |
EISSN | 1872-6887 |
出版年 | 2018 |
卷号 | 167页码:385-398 |
英文摘要 | Interrill erodibility can be affected by soil aggregates, especially by those aggregate size classes that are dominant in the soil. In the Water erosion Prediction Project (WEPP) model, interrill soil erodibility (K-i is estimated using very fine sand content. Despite that some studies have indicated an effect of aggregate stability on the K-i information on the relationship between the aggregate size class and K-i and factors controlling it, particularly in semi-arid region is limited. This study was conducted to determine the variation of K-i for different aggregate size classes under various rainfall intensities and evaluation of the WEPP model in estimating the K-i for different aggregate fractions. Five aggregate size classes (0.25-2, 2-4.75, 4.75-5.6, 5.6-9.75 mm, and 9.75-12.7 mm) were separated from a sandy clay loam soil sampled in an agricultural land and put in laboratory flumes of 100 cm x 50 cm. The flumes were placed on a 9% slope and exposed to ten sequential rainfall simulations varying from 10 to 60 mm h(-1) for 30 min. The K-i of each aggregate size classes was determined using the interrill sediment delivery rate and compared this with the values estimated using WEPP. All physico-chemical properties were also determined in the aggregate size classes. Organic matter content in the aggregate size classes was very low (0.65-0.73%) and didn’t show strong relationships with the aggregate stability and hydraulic conductivity, whereas clay was major factor controlling determining these properties for the different aggregate fractions. Significant differences were found among the aggregate size classes in clay content (P < 0.05), aggregate stability measured using both wet-sieving method (P < 0.05) and water drop test method P < 0.05, saturated hydraulic conductivity (K-s), and measured K-i (P < 0.05). The measured K-i was about 34 and 90 times bigger than the estimated K-i for the fine aggregates and coarse aggregates, respectively. The fine aggregates showed higher susceptibility to interrill detachment with increasing rainfall intensity as compared with the coarse aggregates. Significant decrease was observed in the measured K-i with increasing the aggregate size which was associated with increases in clay content, aggregate stability and K-s. The stability of aggregates against raindrop impact (CND) was an important indicator describing the effect of aggregate size on the interrill erodibility in semi-arid soils. Therefore, this indicator can be taken into account as a soil structure measure to develop a proper equation for estimating interrill erodibility (K-i) for agricultural lands. The minimum use of tillage practices is essential to prevent aggregate breakdown and control interrill erosion in semi-arid regions. |
英文关键词 | Aggregate stability Interrill erosion Rainfall intensity Saturated hydraulic conductivity Semi-arid region |
类型 | Article |
语种 | 英语 |
国家 | Iran ; Netherlands |
收录类别 | SCI-E |
WOS记录号 | WOS:000436382700036 |
WOS关键词 | DIFFERENT TILLAGE SYSTEMS ; LONG-TERM TILLAGE ; ORGANIC-CARBON ; PARTICLE-SIZE ; SUBTROPICAL CHINA ; WATER EROSION ; PHYSICAL-PROPERTIES ; CALCAREOUS SOILS ; RAINDROP IMPACT ; LOESS PLATEAU |
WOS类目 | Geosciences, Multidisciplinary ; Soil Science ; Water Resources |
WOS研究方向 | Geology ; Agriculture ; Water Resources |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/208347 |
作者单位 | 1.Univ Zanjan, Agr Fac, Dept Soil Sci, Zanjan 4537138791, Iran; 2.Wageningen Univ, Soil Phys & Land Management Grp, Droevendaalsesteeg 4, NL-6708 NX Wageningen, Netherlands |
推荐引用方式 GB/T 7714 | Vaezi, Ali Reza,Eslami, Seyedeh Fatemeh,Keesstra, Saskia. Interrill erodibility in relation to aggregate size class in a semi-arid soil under simulated rainfalls[J],2018,167:385-398. |
APA | Vaezi, Ali Reza,Eslami, Seyedeh Fatemeh,&Keesstra, Saskia.(2018).Interrill erodibility in relation to aggregate size class in a semi-arid soil under simulated rainfalls.CATENA,167,385-398. |
MLA | Vaezi, Ali Reza,et al."Interrill erodibility in relation to aggregate size class in a semi-arid soil under simulated rainfalls".CATENA 167(2018):385-398. |
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