干旱区生态环境知识资源中心(Arid): Effect of reduced grazing pressure on sediment and nutrient yields in savanna rangeland streams draining to the Great Barrier Reef

Arid

DOI	10.1016/j.jhydrol.2019.124520
	Effect of reduced grazing pressure on sediment and nutrient yields in savanna rangeland streams draining to the Great Barrier Reef
	Koci, Jack 1; Sidle, Roy C.1,6; Kinsey-Henderson, Anne E.2; Bartley, Rebecca 3; Wilkinson, Scott N.4; Hawdon, Aaron A.2; Jarihani, Ben 1,6; Roth, Christian H.3; Hogarth, Luke 5
通讯作者	Koci, Jack
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2020
卷号	582
英文摘要	Excess sediment and nutrient yields from degraded rangelands have detrimental off-site ecological and on-site economic impacts, yet the effect of reduced grazing pressure on water quality is not fully understood. This study compares 15-year records of runoff, sediment and nutrient yields amongst three ephemeral headwater catchments (10.5-13.5 km(2)) with similar wet/dry tropical climate and landform characteristics, but contrasting cattle grazing pressure. The catchments are located within the Burdekin River basin which is the largest source of sediment and particulate nutrients to the Great Barrier Reef, Australia. Estimated mean annual total suspended sediment (TSS), total nitrogen (TN) and total phosphorus (TP) loads are: 0.6 t ha(-1), 1.3 and 0.3 kg ha(-1), respectively, in a catchment from which cattle were excluded over the study period ('Main Creek'); 1.5 t ha(-1), 1.4 and 0.4 kg ha(-1), respectively, in a catchment where grazing pressure was reduced from approximately 25 to 13 cattle per km(2) at the commencement of monitoring ('Weany Creek'); and 1.4 t ha(-1), 3.0 and 0.5 kg ha(-1), respectively, in a catchment which maintained higher levels of grazing pressure ('Wheel Creek', approximately 25 head per km(2)). Higher annual sediment loads in the grazed catchments compared to the ungrazed catchment are likely due to degradation of soil water storage capacity, soil surface protection and gully erosion rates, but could also be influenced by differences in catchment geomorphic attributes (e.g., hydrological and sediment connectivity). Events with runoff > 20 mm (16-25% of all events) generated 79-85% of the total runoff volume and 71-78% of the total TSS, TN, and TP loads. At the event timescale, there are not clear differences in runoff, sediment and nutrient loads among the catchments, attributed to variability in catchment conditions (e.g., antecedent soil moisture, rainfall intensity, vegetation) that occur within- and between events. It is concluded that recovery of degraded savanna rangelands following reduction in livestock grazing pressure takes decades and is strongly influenced by climate. Measuring water quality responses to land management change in variable climates requires nested spatial monitoring over long time scales that also includes factors that can influence the response (e.g., climate, soil properties, vegetation and land use).
英文关键词	Gully erosion Land degradation Land management Semi-arid Runoff Water quality
类型	Article
语种	英语
国家	Australia ; Tajikistan
收录类别	SCI-E
WOS记录号	WOS:000517663700075
WOS关键词	BRIGALOW ACACIA-HARPOPHYLLA ; BURDEKIN RIVER CATCHMENT ; LAND-USE ; WATER-QUALITY ; SEMIARID RANGELANDS ; SUSPENDED SEDIMENT ; SURFACE WATERS ; FINE SEDIMENT ; SOIL-EROSION ; MANAGEMENT
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
来源机构	Commonwealth Scientific and Industrial Research Organisation
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314993
作者单位	1.Univ Sunshine Coast, Sustainabil Res Ctr, Sippy Downs, Qld 4556, Australia; 2.CSIRO Land & Water, Townsville, Qld 4814, Australia; 3.CSIRO Land & Water, GPO Box 2583, Brisbane, Qld 4001, Australia; 4.CSIRO Land & Water, GPO Box 1700, Canberra, ACT 2601, Australia; 5.Univ Sunshine Coast, Sch Hlth & Sport Sci, Sippy Downs, Qld 4556, Australia; 6.Univ Cent Asia, Mt Soc Res Inst, Khorog Gbao, Tajikistan
推荐引用方式 GB/T 7714	Koci, Jack,Sidle, Roy C.,Kinsey-Henderson, Anne E.,et al. Effect of reduced grazing pressure on sediment and nutrient yields in savanna rangeland streams draining to the Great Barrier Reef[J]. Commonwealth Scientific and Industrial Research Organisation,2020,582.
APA	Koci, Jack.,Sidle, Roy C..,Kinsey-Henderson, Anne E..,Bartley, Rebecca.,Wilkinson, Scott N..,...&Hogarth, Luke.(2020).Effect of reduced grazing pressure on sediment and nutrient yields in savanna rangeland streams draining to the Great Barrier Reef.JOURNAL OF HYDROLOGY,582.
MLA	Koci, Jack,et al."Effect of reduced grazing pressure on sediment and nutrient yields in savanna rangeland streams draining to the Great Barrier Reef".JOURNAL OF HYDROLOGY 582(2020).