土壤团聚体大小对大豆出苗和幼苗生长的影响  

Effect of soil aggregate size on emergence and seedling growth of soybean [Glycine max(L.) Merr.]

作　　者：宋日[1] 刘利[1] 吴春胜[1] 马丽艳[1] 

机构地区：[1]吉林农业大学农学院,吉林长春130118

出　　处：《中国油料作物学报》2009年第2期223-227,共5页Chinese Journal of Oil Crop Sciences

基　　金：国家自然科学基金资助项目(30871487);科技部国家丰粮工程项目(30375647);吉林省农业节本增效技术研究项目(472891)

摘　　要：采用盆栽试验对生长在不同粒径团聚体干旱土壤中大豆出苗和幼苗生长指标进行研究。结果表明，在低土壤含水量条件下，与大粒径团聚体和未筛土壤相比，小粒径团聚体（尤其1～2mm）显著提高大豆出苗率（P〈0．05），缩短出苗时间，显著增加冠干重、苗高及叶面积，显著增加总根长和根表面积，但显著降低主根直径和根干重（P〈O．05）。说明大粒径团聚体不利于干旱土壤大豆出苗和幼苗生长，种床内小粒径团聚体可部分地补偿土壤干旱对大豆出苗和幼苗生长造成的危害。The emergence and seedling growth of soybean [ Glycine max （L.） Merr. ] grown in different soil aggregate sizes under drought were studied by a pot experiment. The results showed that under drought the smaller soil aggregate sizes （especially 1 -2mm）increased the soybean emergence rate, shoot dry weight, seedling height, leaf area, total root length and root surface area significantly （P 〈 0.05 ） in the smaller soil aggregate sizes （especially 1 -2ram）, but decreased the days of emergence, the taproot diameter and root dry weight significantly （P 〈 0.05）. It suggested that the large aggregate sizes had an adverse effect on the emergence and seedling growth of soybean ,the smaller soil aggregate sizes in the seedbed could partly compensate the negative effects of dry soil on the emergence and seedling growth of soybean.

关 键 词：团聚体 大豆 出苗 幼苗 

分 类 号：S152.4[农业科学—土壤学]