Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 411-422 |
| Number of pages | 12 |
| Journal | Agricultural Water Management |
| Volume | 203 |
| Early online date | 26 Mar 2018 |
| DOIs | |
| Publication status | Published - 30 Apr 2018 |
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Keywords
- Agricultural catchment
- End-member mixing model
- Critical Zone Observatory
- Water sources
Cite this
Assessment of water sources and their contributions to streamflow by endmember mixing analysis in a subtropical mixed agricultural catchment. / Lv, Yujuan; Gao, Lei; Geris, Josie; Verrot, Lucile; Peng, Xinhua.
In: Agricultural Water Management, Vol. 203, 30.04.2018, p. 411-422.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Assessment of water sources and their contributions to streamflow by endmember mixing analysis in a subtropical mixed agricultural catchment
AU - Lv, Yujuan
AU - Gao, Lei
AU - Geris, Josie
AU - Verrot, Lucile
AU - Peng, Xinhua
N1 - This work was funded by the China-UK joint Red Soil Critical Zone project from the National Natural Science Foundation of China (NSFC: 41571130053, 41771263) and from the UK Natural Environmental Research Council (NERC: Code: NE/N007611/1). The Ecological Experimental Research Station of Red Soil, Chinese Academy of Sciences is acknowledged for providing the accommodation and facilities.
PY - 2018/4/30
Y1 - 2018/4/30
N2 - Knowledge of the dominant water sources and their relative contributions to streams in time is important for understanding the underlying hydrological processes as well as managing the quantity and quality of water resources. In many subtropical regions, the complexity of mixed agricultural land and water use in combination with lack of data further inhibits such understanding of the dominant catchment scale runoff generation processes. This study provides new insights into the time-variable interactions of natural and anthropogenic influences on the catchment response through integrated hydrometric and multi-tracer (stable water isotopes, Mg2+, Na+, Si4+, Cl−, and Electricity Conductivity) analyses. The combined diagnostic tools of mixing models (DTMM) and end-member mixing analysis (EMMA) were successfully used to evaluate the spatiotemporal variability in key water sources of a subtropical catchment in China. This study site is characterized by rain-fed uplands and irrigated water paddy fields. The EMMA results for one year of data showed that irrigation water, rainwater and ground water were the three main sources, which contributed to 64%, 19% and 17% of the streamflow on average, respectively. However, temporal patterns in rainfall and irrigation practices did cause significant variability in these relative contributions. Overall, we found that routine agricultural practices to optimize crop growth (especially during paddy growth periods) was a more important factor than hydro-meteorological conditions in controlling the regime and properties of water sources. The relatively simple but successful application of EMMA and DTMM in a complex environment demonstrates that it is a valuable approach for understanding water sources and hydrologic processes concerning agricultural or mixed-land use catchments.
AB - Knowledge of the dominant water sources and their relative contributions to streams in time is important for understanding the underlying hydrological processes as well as managing the quantity and quality of water resources. In many subtropical regions, the complexity of mixed agricultural land and water use in combination with lack of data further inhibits such understanding of the dominant catchment scale runoff generation processes. This study provides new insights into the time-variable interactions of natural and anthropogenic influences on the catchment response through integrated hydrometric and multi-tracer (stable water isotopes, Mg2+, Na+, Si4+, Cl−, and Electricity Conductivity) analyses. The combined diagnostic tools of mixing models (DTMM) and end-member mixing analysis (EMMA) were successfully used to evaluate the spatiotemporal variability in key water sources of a subtropical catchment in China. This study site is characterized by rain-fed uplands and irrigated water paddy fields. The EMMA results for one year of data showed that irrigation water, rainwater and ground water were the three main sources, which contributed to 64%, 19% and 17% of the streamflow on average, respectively. However, temporal patterns in rainfall and irrigation practices did cause significant variability in these relative contributions. Overall, we found that routine agricultural practices to optimize crop growth (especially during paddy growth periods) was a more important factor than hydro-meteorological conditions in controlling the regime and properties of water sources. The relatively simple but successful application of EMMA and DTMM in a complex environment demonstrates that it is a valuable approach for understanding water sources and hydrologic processes concerning agricultural or mixed-land use catchments.
KW - Agricultural catchment
KW - End-member mixing model
KW - Critical Zone Observatory
KW - Water sources
U2 - 10.1016/j.agwat.2018.03.013
DO - 10.1016/j.agwat.2018.03.013
M3 - Article
VL - 203
SP - 411
EP - 422
JO - Agricultural Water Management
JF - Agricultural Water Management
SN - 0378-3774
ER -