栽培沙打旺对沙荒地水肥状况影响的研究  

The Effect of Water and Fertility of Sandy Soil by Planting of Astragalus absurgens

作　　者：曾宪竞[1] 蔡朵珍 陶益寿 

机构地区：[1]中国农业大学,北京圆明园西路2号100094

出　　处：《中国农业大学学报》1997年第3期59-67,共9页Journal of China Agricultural University

摘　　要：本试验连续四年研究了北京地区在依靠自然降水的条件下，沙打旺在沙荒地上的生长情况。结果表明，沙打旺长势良好，每年可产干草11250kg·hm-2。在沙打旺生长期间，迟干旱年份时，土壤水分状况0～40cm土层为干上层．0～200cm土层的土壤重量含水量低达3％；在雨季期间．土壤的水分状况得以恢复。土壤的肥力状况表现为全氮、全磷、碱解氮、速效磷以及土壤有机质含量都有减少；仅速效钾含量增加。本试验还研究了沙打旺抗旱的生物学特性，如沙打旺根系在不同土层中的分布特点、根毛与细土粒之间的紧密结合、沙打旺以基都叶脱落的方式来减少蒸腾躲避干旱等等。本试验为北京地区沙荒地的利用以及沙打旺的种植提供了参考的依据。The possibility of planting Astragalus. absurgens on the sandy soil in Beijing area under natural precipitation was studied for 4 years. In this investigation, Astragalus.absurgens grew well and the herbage reached 750 kg·hm-2 annually. Soil moisture in upper layer of soil profile(0~40 cm)in dry season was very low, and in 0~200 cm was less than 3% in day season. However the moral soil moisture resumed in rain soil nitrogen and phosphorus, soil organic matter, soil alkaline hydrolysable N and available P decreased,but the soil available K increased. Moreover, the drought-rsistance of Astragalus. absurgens was investigated. Its roots had a special distribution pattern in soil, root hairs had a close contact with the fine particles and leaves were lost under drought condition.

关 键 词：沙荒地 沙打旺 水肥 栽培 

分 类 号：S541.906[农业科学—作物学]