Arid
DOI10.1016/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, Jack1; Sidle, Roy C.1,6; Kinsey-Henderson, Anne E.2; Bartley, Rebecca3; Wilkinson, Scott N.4; Hawdon, Aaron A.2; Jarihani, Ben1,6; Roth, Christian H.3; Hogarth, Luke5
通讯作者Koci, Jack
来源期刊JOURNAL OF HYDROLOGY
ISSN0022-1694
EISSN1879-2707
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).
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