黄河三角洲地区苜蓿生态适应性研究

本文研究了不同苜蓿品种在黄河三角洲地区的生态适应性。结果表明，该地区紫花苜蓿的根系主要分布于０￣３０ｃｍ土层，因受到潜水水位及盐分的影响，主根被伤害从而诱导侧根发育是苜蓿适应该地区的主要特征之一。根系对降低表层土壤含盐量及有机质和全氮含量的增加有明显效果。当地地方品种无棣苜蓿对降低土壤离子含量的程度各异，对降低ＣＯ３＾２－、Ｃｌ＾－、ＳＯ４＾２－和Ｎａ＾＋含量的作用明显，对ＨＣＯ３＾－、Ｃａ＾２＋

Study on the Adaptation of Alfalfa in Yellow River Delta

This experiments studies on the adaptation of different alfalfa in Yellow River delta. The results are as follow:Root of alfalfa are mainly distributed in 0~30cm layer below the surface of soil because of the high paretic water and soil salt- It will induced production of secondary roots after its taproot was severed. Developmental secondary roots were one of the main characters for alfalfa to adapt in this region. Root system can greatly declined the content of total soil salt, and increased the contents organic matter and total nitrogen of 0~30cm soil layer, The 1Wudi' alfalfa had different effect on different soil ions, it can greatly declined the contents of CO32-,C1-,SO42- and Na+,and can declined the contents of HCO3-,Ca2+,Mg2+, and K+. 1Naiyan', tGerman' and 1Wudi' alfalfa had high root regeneration ability (RRA),RRA of -Baoding' and 1Bilu' alfalfa in the middle level, RRA of 'Longdong' and 'Tongxin' were low in the field experiment. In order to develpoment alfalfa industry in this area, We should select high RRA alfalfa cultivars, build water conservancy project and plant alfalfa with high density.