丹江口库区产水量时空动态与情景模拟

doi:10.11707/j.1001-7488.20201102

Abstract

Abstract:

Objective: The InVEST model and scenario analysis were used to study the spatial-temporal dynamics of water yield in Danjiangkou reservoir area, in order to provide a scientific basis for the improvement and control of water conservation capacity in the reservoir area. Method: The InVEST model was used to quantitatively study the changes of temporal of water yield in 2003, 2013, and 2018. The changes of water yield depth under different land use/cover types were analyzed and compared. The effects of annual precipitation and land use/cover type changes on water yield were investigated by scenario simulation method. Result: The annual water yield of Danjiangkou from 2003 to 2018 showed a trend of a weakening followed by a strengthening, including the annual water yield depth of 310.09 mm and water yield of 1.36 billion m³ in 2003, the annual water yield depth of 146.67 mm and water yield of 525 million m³ in 2013, and the annual water yield depth of 166.06 mm and water yield of 728 million m³ in 2018, which decreased by 46.47% in 15 years. On the whole, the water yield per unit area is not evenly distributed in space. The northern hilly and mountainous areas are 39.84%-57.79% higher than the southern ones. The water yield depth of each land use/cover type showed a trend of a decrease followed by a slow increase. The highest water yield depth was urbanized land (530.35 mm), followed by cropland (292.85 mm), orangery (284.07 mm) and woodland (273.76 mm). Scenario simulation shows that annual precipitation and land use/cover type are the main factors affecting water yield. The contribution rate of precipitation in 2013 was 92.43%, and the change of land use/cover type contributes 64.71% to 2018. Conclusion: The InVEST model can be used to monitor the spatial-temporal dynamic changes of water yield in the reservoir area, and pay close attention to the influence of precipitation and land use/cover type changes on water yield, therefore providing a scientific basis for the improvement of water conservation capacity in the reservoir area.

Key words: InVEST model, water yield, scenario simulation, Danjiangkou City, water source conservation

CLC Number:

S719
Q148

Jian Zhang,Gang Lei,Lianghua Qi. Temporal and Spatial Dynamics and Scenario Simulation of Water Yield in Danjiangkou Reservoir Area[J]. Scientia Silvae Sinicae, 2020, 56(11): 12-20.

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年份Year	W_O/10⁸ m³	W_L/10⁸ m³	W_C/10⁸ m³	W_T/10⁸ m³	ΔW_C/10⁸ m³	ΔW_L/10⁸ m³
2013	5.25	5.68	10.5	-5.68	-5.25	-0.43
2018	7.28	9.7	8.6	-3.74	-1.32	-2.42

年份Year	项目 Item	水域 Water area	林地 Woodland	耕地 Cropland	园地 Orangery	建设用地 Urbanized land	未利用地 Barren land
2003	面积Area/hm²	17 101	127 153	52 277	85 409	19 400	10 240
	比例Proportion(%)	5.49	40.81	16.78	27.41	6.23	3.28
2013	面积Area/hm²	23 188	151 753	41 694	65 765	18 448	10 732
	比例Proportion(%)	7.44	48.70	13.38	21.11	5.92	3.45
2018	面积Area/hm²	27 617	158 413	36 600	56 043	21 953	10 954
	比例Proportion(%)	8.86	50.84	11.75	17.99	7.04	3.52

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Temporal and Spatial Dynamics and Scenario Simulation of Water Yield in Danjiangkou Reservoir Area

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