干旱区生态环境知识资源中心(Arid): Coupled influence of precipitation and vegetation on millennial-scale erosion rates derived from Be-10

Arid

DOI	10.1371/journal.pone.0211325
	Coupled influence of precipitation and vegetation on millennial-scale erosion rates derived from Be-10
	Mishra, Ashish Kumar 1,2; Placzek, Christa 1,2; Jones, Rhondda 3
通讯作者	Mishra, Ashish Kumar
来源期刊	PLOS ONE
ISSN	1932-6203
出版年	2019
卷号	14 期号:1
英文摘要	Water is one of the main agent of erosion in many environmental settings, but erosion rates derived from beryllium-10 (Be-10) suggests that a relationship between precipitation and erosion rate is statistically non-significant on a global scale. This might be because of the strong influence of other variables on erosion rate. In this global Be-10 compilation, we examine if mean annual precipitation has a statistically significant secondary control on erosion rate. Our secondary variable assessment suggests a significant secondary influence of precipitation on erosion rate. This is the first time that the influence of precipitation on Be-10-derived erosion rate is recognized on global scale. In fact, in areas where slope is <200m/km (similar to 11 degrees), precipitation influences erosion rate as much as mean basin slope, which has been recognized as the most important variable in previous Be-10 compilations. In areas where elevation is <1000m and slope is <11 degrees, the correlation between precipitation and erosion rate improves considerably. These results also suggest that erosion rate responds to change in mean annual precipitation nonlinearly and in three regimes: 1) it increases with an increase in precipitation until similar to 1000 mm/yr; 2) erosion rate stabilizes at similar to 1000 mm/yr and decreases slightly with increased precipitation until similar to 2200 mm/yr; and 3) it increases again with further increases in precipitation. This complex relationship between erosion rate and mean annual precipitation is best explained by the interrelationship between mean annual precipitation and vegetation. Increased vegetation, particularly the presence of trees, is widely recognized to lower erosion rate. Our results suggest that tree cover of 40% or more reduces erosion rate enough to outweigh the direct erosive effects of increased rainfall. Thus, precipitation emerges as a stronger secondary control on erosion rate in hyper-arid areas, as well as in hyper-wet areas. In contrast, the regime between similar to 1000 and similar to 2200 mm/yr is dominated by opposing relationships where higher rainfall acts to increase erosion rate, but more water also increases vegetation/tree cover, which slows erosion. These results suggest that when interpreting the sedimentological record, high sediment fluxes are expected to occur when forests transition to grasslands/savannahs; however, aridification of grasslands or savannahs into deserts will result in lower sediment fluxes. This study also implies that anthropogenic deforestation, particularly in regions with high rainfall, can greatly increase erosion.
类型	Article
语种	英语
国家	Australia
开放获取类型	Green Published, gold, Green Accepted
收录类别	SCI-E
WOS记录号	WOS:000457037500149
WOS关键词	WEAK CLIMATIC CONTROL ; SITU-PRODUCED BE-10 ; DENUDATION RATES ; SOIL-EROSION ; COSMOGENIC NUCLIDES ; SEDIMENT TRANSPORT ; PLATEAU UPLIFT ; SOUTHERN ASIA ; ROCK UPLIFT ; HALF-LIFE
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/218077
作者单位	1.James Cook Univ, Geosci, Coll Sci & Engn, Townsville, Qld, Australia; 2.James Cook Univ, Ctr Trop Environm & Sustainabil Sci TESS, Townsville, Qld, Australia; 3.James Cook Univ, StatsHelp Serv, Grad Res Sch, Townsville, Qld, Australia
推荐引用方式 GB/T 7714	Mishra, Ashish Kumar,Placzek, Christa,Jones, Rhondda. Coupled influence of precipitation and vegetation on millennial-scale erosion rates derived from Be-10[J],2019,14(1).
APA	Mishra, Ashish Kumar,Placzek, Christa,&Jones, Rhondda.(2019).Coupled influence of precipitation and vegetation on millennial-scale erosion rates derived from Be-10.PLOS ONE,14(1).
MLA	Mishra, Ashish Kumar,et al."Coupled influence of precipitation and vegetation on millennial-scale erosion rates derived from Be-10".PLOS ONE 14.1(2019).