---

作 者 ：石辉1;2;吴金水2;陈占飞3

期 刊 ：植物营养与肥料学报 2002年 8卷 4期 页码：385-389

关键词：陕北沙区；风沙土；养分特征；

Keywords:desert region of northern Shaanxi, aeolian sandy soils, characteristics of nutrients,

摘 要 ：通过分析陕北沙区榆林市不同利用方式形成的流动风沙土、半固定风沙土、固定风沙土(紧沙土)和由人类生产活动形成的耕种固定风沙土、耕灌固定风沙土的养分特征,发现随着植被的增加,流动沙丘逐渐被固定,流动风沙土、半固定风沙土、固定风沙土含有较多养分的细颗粒增多使表层养分逐渐增加。耕种固定风沙土由于生产活动,加速了土壤有机质的矿化,使土壤有机质、氮素含量降低;而磷肥的使用,使土壤有效磷增加。耕灌固定风沙土作为当地的基本农田受人类活动影响,引水拉沙,增加土壤细颗粒含量,且大量施肥,使这种土壤的肥力有了较大地提高。

Abstract:In this paper, the nutrient characteristics of five kinds of aeolian sandy soils sampled from Yulin municipality of northern Shaanxi Province were studied Among these soils, moving, semifixed, and fixed aeolian sandy soils are formed under natural conditions, and cultivatedfixed, irrigatedfixed aeolian sandy soils are formed through artificial cultivation activities The results showed that with the increase of vegetation, moving dunes were gradually fixed, the nutrient content of surface soil gradually increased from moving aeolian sandy soil to semifixed and fixed aeolian sandy soil because the fine grains, which contain more nutrients, were not blown away at a large degree and the content of fine grains in soils gradually increased after vegetation cover improved The contents of soil organic matter and nitrogen decreased because of the accelerated mineralization of organic matter by human activities Meanwhile, application of phosphorus fertilizer made the available phosphorus enhance The irrigatedfixed aeolian sandy soil, the principal farmland in Yulin municipality, was intensively affected by artificial production activities The fertility of irrigatedfixed aeolian sandy greatly improved by irrigation and fertilization, so the soil nutrient content was higher than that of other soils

---