| 宁南黄土丘陵区坡耕地土壤侵蚀对土地生产力影响研究 |
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| 引用本文： | 陈奇伯,齐实,孙立达,张宇清,柳长顺.宁南黄土丘陵区坡耕地土壤侵蚀对土地生产力影响研究[J].北京林业大学学报,2001,23(1):34-37. |
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| 作者姓名： | 陈奇伯 齐实 孙立达 张宇清 柳长顺 |
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| 作者单位： | 北京林业大学水土保持学院，100083，北京 |
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| 基金项目： | “九五”国家科技攻关“宁南缓坡丘陵区（西吉）农牧综合发展研究”（96-004-05-01）专题资助 |
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| 摘 要： | 坡耕地土壤侵蚀对土地生产力的影响表现在多方面 .该文运用模拟侵蚀方法 ,对宁夏西吉县黄土丘陵区坡耕地表层土壤发生不同程度侵蚀后 ,表土养分流失、作物产量和生物量下降的状况进行了定量测试分析 .结果显示 :①耕作层 (0～ 2 0cm)土壤肥力指标有机质、全N、碱解N、全P分别比下层土壤 (2 0～ 6 0cm)高 14 2 % ,12 0 % ,37 3%和 9 2 % ,且流失土壤的养分富集现象明显 .②种植春小麦和豌豆的坡耕地 ,每流失 1cm表土 ,产量分别下降 1 9%～ 3 1%和 2 0 %～ 2 6 % ,而马铃薯和胡麻产量分别降低 0 9%～ 1 0 %和 0 9%～ 1 5 % .③发生强度和剧烈侵蚀的坡耕地 ,每年农作物产量下降幅度为 0 35 %～ 1 76 %和 1 0 7%～ 3 36 % .
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| 关 键 词： | 坡耕地 土壤侵蚀 土地生产力 土壤养分 作物产量 |
Impact of soil erosion on soil productivity of sloping field in hilly-gully region of Loess Plateau in south Ningxia |
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| Journal of Beijing Forestry University.Impact of soil erosion on soil productivity of sloping field in hilly-gully region of Loess Plateau in south Ningxia[J].Journal of Beijing Forestry University,2001,23(1):34-37. |
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| Authors: | Journal of Beijing Forestry University |
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| Abstract: | Soil erosion of sloping field affects soil productivity indifferent aspects. This paper measures and analyses the loss of nutrient on top soil, the reduction of crop yields and bio-masses with the method of simulated soil erosion on the sloping fields in the hilly-gully region of Xiji County, Ningxia Hui Autonomous Region. The results show that ① the organic matter content, total N, quick-acting N and total P of the upper soil layer(0～20cm) are respectively 14.2%, 12.0%, 37.3% and 9.2% higher than the lower layer(20～60cm), the nutrient is rich in the lost soil and poor in the remained soil, ② the yields of spring-wheat and pea of the sloping field in different slope degrees decrease by 1.9% to 3.1% and by 2.0% to 2.6% when top-soil losses every 1cm in thickness, while the yields of potato and flax decrease by 0.9% to 1.0% and by 0.9% to 1.5%, ③ the yields and bio-masses of the steep sloping field from 10°to 20°decrease separately by 0.35% to 1.76% and by 1.07% to 3.36% per year. |
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| Keywords: | sloping field soil erosion soil productivity soil nutrient crop yield |
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