| 末次间冰期以来黄河中游黄土高原沟谷侵蚀-堆积过程初探 |
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| 引用本文： | 邓成龙,袁宝印.末次间冰期以来黄河中游黄土高原沟谷侵蚀-堆积过程初探[J].地理学报,2001,11(1):92-98. |
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| 作者姓名： | 邓成龙 袁宝印 |
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| 作者单位： | 中国科学院地质与地球物理研究所，北京 100029 |
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| 基金项目： | 国家自然科学基金重大项目!( 59890 2 0 0 )&& |
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| 摘 要： | 以陕西洛川北汉寨小流域为基础，建立末次间冰期以来黄河中游黄土高原的沟谷侵蚀－堆积模式，并定量计算流域不同时期侵蚀模数或堆积速率，初步恢复了末次间冰期以来黄土高原中部地区的沟谷侵蚀－堆积过程。计算结果表明，末次间冰期公来，黄土高原中部地区的自然侵蚀作用可能在逐渐加剧。侵蚀－堆积是黄土区沟谷发育的基本过程，并与气候变化密切相关。侵蚀期相当于湿润期，也就是降雨量大的时期；沉积黄土层的时期沟谷发育大大减缓甚至停止，并且在原来的谷底、谷坡上还可堆积黄土。
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| 关 键 词： | 黄土高原 沟谷侵蚀－堆积模式 末次间冰期 侵蚀模数 堆积速率 气候变化 |
| 文章编号： | 0375-5444(2001)01-0092-07 |
| 收稿时间： | 2000-08-10 |
| 修稿时间： | 2000年2月20日 |
Responses of soil nutrient to driving mechanism in Taihu Lake basin in last 20 years |
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| CHEN Fu,PENG Bu-zhuo,BAO Hao-sheng.Responses of soil nutrient to driving mechanism in Taihu Lake basin in last 20 years[J].Acta Geographica Sinica,2001,11(1):92-98. |
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| Authors: | CHEN Fu PENG Bu-zhuo BAO Hao-sheng |
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| Institution: | Department of Urban and Resources Science, Nanjing University, Nanjing 210093, China |
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| Abstract: | The objectives of this study is to understand the changing law of soil nutrient quality in Taihu Lake basin, Yangtze Delta in last 20 years, and reveal the relationship between soil nutrient changes and human driving forces in regional level over long period of time. Experiment on long-term collecting samples was conducted to study changes of soil organic matter, total N, available N, available P and available K in Dongting town, Wuxi city during the last 20 years. The paper analyses the co-relationship of the fluctuation of soil nutrient and state policy, cultivating practice, agricultural input, and per hectare agricultural net income. The results showed that at first the content of soil organic matter increased, then decreased, and increased again. The content of total N and available N steadily increased. The content of available K and available P steadily decreased. The authors found that the influence of state policy and cultivating practice on soil nutrient quality index (SNQI) is obvious, agricultural input and SNQI are positively correlated, and per hectare agricultural net income and SNQI are negatively correlated. |
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| Keywords: | Loess Plateau gully erosion accumulation model gully erosion accumulation process |
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