Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR027495 |
Tropical montane forest conversion is a critical driver for sediment supply in East African catchments | |
Jaqueline Stenfert Kroese; Suzanne R. Jacobs; Wlodek Tych; Lutz Breuer; John N. Quinton; Mariana C. Rufino | |
2020-09-16 | |
发表期刊 | Water Resources Research |
出版年 | 2020 |
英文摘要 | Land use change is known to affect suspended sediment fluxes in headwater catchments. There is however limited empirical evidence of the magnitude of these effects for montane catchments in East Africa. We collected a unique four‐year high frequency dataset and assessed seasonal sediment variation, water pathways and sediment response to hydrology in three catchments under contrasting land use in the Mau Forest Complex, Kenya’s largest tropical montane forest. Annual suspended sediment yield was significantly higher in a smallholder agriculture‐dominated catchment (131.5±90.6 t km‐2 yr‐1) than in tea‐tree plantations (42.0±21.0 t km‐2 yr‐1) and a natural forest catchment (21.5±11.1 t km‐2 yr‐1) (p<0.05). Transfer function models showed that in the natural forest and tea‐tree plantations subsurface flow pathways delivered water to the stream, while in the smallholder agriculture shallow subsurface and surface runoff were dominant. There was a delayed sediment response to rainfall for the smallholder agriculture and the tea‐tree plantations. A slow depletion in sediment supply suggests that the wider catchment area supplies sediment, especially in the catchment dominated by smallholder farming. In contrast, a fast sediment response and depletion in sediment supply in the natural forest suggests a dominance of temporarily stored and nearby sediment sources. This study shows that the vegetation cover of a forest ecosystem is very effective in conserving soil, whereas catchments with more bare soil and poor soil conservation practices generated six times more suspended sediment yield. Catchment connectivity through unpaved tracks is thought to be the main explanation for the difference in sediment yield. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/295334 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Jaqueline Stenfert Kroese,Suzanne R. Jacobs,Wlodek Tych,et al. Tropical montane forest conversion is a critical driver for sediment supply in East African catchments[J]. Water Resources Research,2020. |
APA | Jaqueline Stenfert Kroese,Suzanne R. Jacobs,Wlodek Tych,Lutz Breuer,John N. Quinton,&Mariana C. Rufino.(2020).Tropical montane forest conversion is a critical driver for sediment supply in East African catchments.Water Resources Research. |
MLA | Jaqueline Stenfert Kroese,et al."Tropical montane forest conversion is a critical driver for sediment supply in East African catchments".Water Resources Research (2020). |
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