[1]JIN Feng,ZHANG Fu,HU Yanting,et al.Effect of Change in Precipitation-Land Use on Runoff and Sediment Transport in Semi-Arid Areas[J].Research of Soil and Water Conservation,2020,27(03):63-69.
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Effect of Change in Precipitation-Land Use on Runoff and Sediment Transport in Semi-Arid Areas
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 03
Page number:
63-69
Column:
目次
Public date:
2020-04-20
- Title:
- Effect of Change in Precipitation-Land Use on Runoff and Sediment Transport in Semi-Arid Areas
- CLC:
- P333
- DOI:
- -
- Abstract:
- In order to further study the internal mechanism and relationship of effects of annual precipitation and land use patterns on annual runoff and sediment transport, Anding District, Dingxi City, Gansu Province was selected as the research area, and Mann-Kendall trend test and mutation detection method were used to study the trend of regional annual precipitation, runoff and sediment transport, and to detect the time of mutation. Fitting and regression analysis on the relationship between annual precipitation, land use and annual runoff, and sediment transport were carried out. The results show that:(1)during the period from 1957 to 2016, the annual precipitation decreased slightly and was not significant (p>0.05), the annual runoff and sediment transport presented the fluctuating downward trend and reached the significant level (p<0.01); with respect to the correlation between annual precipitation, runoff and sediment transport, from 1957 to 1985, annual runoff and sediment transport had strongly responded to precipitation changes, and the trend was highly synergistic, from 1986 to 2016, annual runoff and sediment transport had less responded to precipitation changes, and the trend was synergistically divergent, indicating that the annual runoff and sediment change in the study area was increasingly affected by other factors such as soil and water conservation measures, especially after 2001, the impact of annual precipitation was smaller;(2)the sloping farmland, unused land and other land uses in non-controlled area were decreasing year by year, which was positively correlated with annual runoff and sediment transport, the non-controlled area had the good exponential and power function relationships with annual runoff and sediment transport, respectively (p<0.01); the terrace, artificial afforestation, artificial grass planting, enclosure and construction land in the controlled area were increasing year by year, and were negatively correlated with annual runoff and sediment transport; check dams increased at first and then remained unchanged in the channel engineering, and were negatively correlated with runoff and sediment transport, the controlled area and check dams had a good exponential relationship with annual runoff and sediment transport (p<0.01). This study can provide the basis for the understanding of the internal mechanism of precipitation, land use and annual runoff and sediment transport.
- References:
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Last Update:
2020-04-30