| 黄土高原作物产量及水土流失地形分异模拟 |
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| 引用本文： | 徐勇,杨波,刘国彬,刘普灵.黄土高原作物产量及水土流失地形分异模拟[J].地理学报(英文版),2009,19(3):331-339. |
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| 作者姓名： | 徐勇 杨波 刘国彬 刘普灵 |
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| 作者单位： | |
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| 基金项目： | 中国科学院知识创新工程项目，国家自然科学基金 |
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| 摘 要： | De-farming slope farmland has been an effective measure in recent years for the improvement of the eco-environment and the mitigation of soil and water loss on the Loess Plateau. This paper, taking the Yangou Basin as a case study and using day-by-day mete- orological data of Yan'an station in 2005, simulated and analyzed the quantitative relation between crop yield, soil and water loss and topographic condition with the aid of WIN-YIELD software. Results show that: 1) topographic gradient has important influence on crop yield. The bigger gradient is, the lower the crop yield. Yields of sorghum and corn decrease by 15.44% and 14.32% respectively at 25° in comparison to the case of 0°. In addition, yields of soya, bean and potato decrease slightly by 5.26%, 4.67% and 3.84%, respectively. The in- fluences of topographic height and slope aspect on crop yield are slight. 2) Under the same topographic condition, different crops' runoff and soil loss show obvious disparity. Topographic gradient has important influence on soil and water loss. In general, the changing trend is that the soil and water loss aggregates with the increase of gradient, and the maximal amount occurs around 20°. The influence of topographic height is slight. Topographic aspect has a certain effect, and the fundamental characteristic is that values are higher at the aspect of south than north. 3) Topographic gradients of 5° and 15° are two important thresholds. The characteristic about soil and water loss with the variation of topographic gradients show that: the slope farmland with gradient less than 5° could remain unchanged, and the slope farm- land more than 15° should be de-farmed as early as possible.
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| 关 键 词： | 作物产量 水土流失 地形条件 黄土高原 模拟 土壤流失量 地形梯度 分化 |
| 收稿时间： | 27 August 2009 |
Topographic differentiation simulation of crop yield and soil and water loss on the Loess Plateau |
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| Yong Xu,Bo Yang,Guobin Liu,Puling Liu.Topographic differentiation simulation of crop yield and soil and water loss on the Loess Plateau[J].Journal of Geographical Sciences,2009,19(3):331-339. |
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| Authors: | Yong Xu Bo Yang Guobin Liu Puling Liu |
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| Institution: | [1]Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China [2]Institute of Soil and Water Conservation, CAS, Yangling 712100, Shaanxi, China |
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| Abstract: | De-farming slope farmland has been an effective measure in recent years for the improvement of the eco-environment and the
mitigation of soil and water loss on the Loess Plateau. This paper, taking the Yangou Basin as a case study and using day-by-day
meteorological data of Yan’an station in 2005, simulated and analyzed the quantitative relation between crop yield, soil and
water loss and topographic condition with the aid of WIN-YIELD software. Results show that: 1) topographic gradient has important
influence on crop yield. The bigger gradient is, the lower the crop yield. Yields of sorghum and corn decrease by 15.44% and
14.32% respectively at 25° in comparison to the case of 0°. In addition, yields of soya, bean and potato decrease slightly
by 5.26%, 4.67% and 3.84%, respectively. The influences of topographic height and slope aspect on crop yield are slight. 2)
Under the same topographic condition, different crops’ runoff and soil loss show obvious disparity. Topographic gradient has
important influence on soil and water loss. In general, the changing trend is that the soil and water loss aggregates with
the increase of gradient, and the maximal amount occurs around 20°. The influence of topographic height is slight. Topographic
aspect has a certain effect, and the fundamental characteristic is that values are higher at the aspect of south than north.
3) Topographic gradients of 5° and 15° are two important thresholds. The characteristic about soil and water loss with the
variation of topographic gradients show that: the slope farmland with gradient less than 5° could remain unchanged, and the
slope farmland more than 15° should be de-farmed as early as possible.
Foundation: Knowledge Innovation Project of the Chinese Academy of Sciences, No.KZCX2-XB2-05-01; National Natural Science Foundation
of China, No.40771086
Author: Xu Yong (1964–), Ph.D and Professor, specialized in land sciences, regional sustainable development, agriculture and rural
development. |
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| Keywords: | crop yield soil and water loss topographic differentiation Loess Plateau |
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