| 摘要: |
| 以黄土丘陵沟壑区安塞试区为例，通过野外调查和室内分析，对小流域土壤养分状况进行了研究。结果表明，该地区土壤肥力状况较差,主要养分含量表现为：干旱冲积新成土＞黄土正常新成土＞红色正常新成土，乔木林地＞灌木林地＞荒草地＞农田，梁峁下部＞梁峁顶部＞梁峁上部；农田土壤养分在剖面上的分布上下均一，林草地则由上而下锐减，表聚性明显。山坡地退耕，植树种草，防止水土流失，保护生态环境；增加肥料施用量，注重平稀施肥是培肥改良土壤的基本措施。 |
| 关键词: 小流域 土壤养分 空间分布 土壤培肥改良 黄土高原 安塞试区 |
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| 基金项目:国家“九五”科技攻关项目(96-007-01-01-02)；国家自然科学基金资助项目(49941005,30190790) |
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| Soil nutrient distribution in the small watershed of Ansai |
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| Abstract: |
| The goal in this paper is to study the soil nutrient detailed situation and modify land use mode.Based om outdoor investigation and indoor analysis for the soil nutrient situation in Ansai experimental area,the results show ,the fertility of soil is very poor.The main nutrient content in soil groups shows:Vst-Alluvic-Entisol>Los-Oothic-Entisols>Red-Orthic-Entisols,in various vegetation shows:the Lower part on hilly>the ultimate on hhilly>the upper part on hilly；the nutrient distrbute even on profile,yet the nutrients of forest and grass land decrease sharply form upper to lower.At last soil improvement and main controlling nutrients are raised in this paper. |
| Key words: small-size reach soil nutrients,nutrient spatial distribution controlling measurement ,Loess Plateau Ansai experimental area |
