南洋楹幼苗生长的土培试验研究

SOIL CULTURE EXPERIMENT ON THE GROWTH OF Albizzia falcata SEEDLINGS

摘要: 对南洋楹（Ａｌｂｉｚｚｉａｆａｌｃａｔａ）幼苗进行了不同土壤质地、水分、接种效应的土培试验以及固氮酶活性测定。结果表明：１．中壤土和砂壤土对苗木生长和结瘤均有利，而含砂量≤１６．６％的粘重、紧实土壤使幼苗生长受抑制。２．不同质地的土壤接种根瘤菌的效果差异较大，以中镶土、砂壤土效果最佳。３．经测定，南洋楹根瘤菌的固氮酶活性偏低（≤１１．０４（μｍｏｌ·Ｌ－１）Ｃ２Ｈ４·ｇ－１鲜瘤·ｈ－１），可能是测定前长期低温阴雨天气所致，还待进一步深入研究。

Abstract: Soil culture experiment on the effects of soil texture,water supply and tuberele-bacteria inoculation on Albizzia falcata seedlings was conducted and the activity of nitrogen-fixing enzyme measured.Results showed:1.Medium loam and sandy loam were favorable to seedling growth and tobercle formatio n while hard and clayey soilwith sand content less than 16.6% inhibited growth;2.There was a great differencein the results of tuberde-bacteria inoculation among different soil textures,the bestbeing medium loam and sandy loam;3.Measurement suggested that the long periodof low temperature and rainy humidity might have caused the low activity of nitro-gen-fixing enzyme in the tubercles.For definite conclusion,further study is needed.