PAM施用深度对盐碱胁迫下藜麦生长及生理指标的影响

Effects of PAM Application Depth on the Growth and Physiological Indexes of Quinoa under Saline Alkali Stress

以陇藜4号为试验材料,采用根管土柱栽培试验,设置轻度(S1,3g/kg)、中度(S2,5g/kg)和重度盐碱胁迫(S3,7g/kg)以及土壤调理剂聚丙烯酰胺(PAM)施用深度0~10(PAM_(0))、10~20(PAM_(10))、20~30(PAM_(20))和0~30cm(PAM_(30))的完全随机试验组合,以土壤中不加盐碱和PAM为对照组(S0),共计13个处理组合,研究PAM施用深度对不同盐碱胁迫条件下藜麦生长及生理指标的影响。结果表明,盐碱胁迫处理和PAM施用深度处理均会对藜麦的形态指标和生理指标造成显著影响:在合理施用PAM的前提下,与对照相比,轻度盐胁迫反而更有利于藜麦的生长,甚至中度盐胁迫下藜麦生长也没受到显著影响,表明藜麦具有较强的耐盐性。当盐碱胁迫达到重度(S3)时,虽然不同PAM施用浓度对藜麦生长有一定影响,但与对照相比,盐碱胁迫均显著抑制了藜麦地上部的生长;不同盐碱胁迫条件下不同PAM施用方式对藜麦生长及生理指标的影响均表现为PAM_(0)处理的效果最佳。隶属函数结果表明,不同处理条件下藜麦生长状况及耐盐碱性表现为S1>S2>S3,PAM_(0)>PAM_(30)>PAM_(10)>PAM_(20),说明在生产实践中采用表层集中施用PAM的方式最有利于缓解盐胁迫对藜麦产生的不良影响。

Using Longli No.4 as material,the root canal soil column cultivation experiment was carried out,three kinds of salt-alkali conditions were set included mild salt-alkali stress(S1,3g/kg),moderate salt-alkali stress(S2,5g/kg),and severe salt-alkali stress(S3,7g/kg),the four kinds of soil conditioner polyacrylamide(PAM)application depth[0-10(PAM_(0)),10-20(PAM_(10)),20-30(PAM_(20))and 0-30cm(PAM_(30))]were set.They were totally randomized trial combinations,as well as control group(S0)without saline and PAM,a total of 13 treatments were performed.The effects of PAM application depth on growth and physiological indexes of quinoa under different salt-alkali stress conditions were studied.The results showed that,salt-alkali stress and PAM application significantly affected the morphological and physiological indexes of quinoa.Under the premise of reasonable application of PAM,compared with the control,the lower degree of salt stress was more beneficial to the growth of quinoa,and even the growth of quinoa was not significantly affected under moderate salt stress,indicating that quinoa had a strong salt tolerance.When salt-alkali stress reached severe stress(S3),the growth of quinoa was significantly inhibited by PAM compared with the control,although different PAM concentrations had a certain effects on the growth of the upper part of quinoa.Under different salt-alkali stress conditions,the effects of PAM_(0) on the growth and physiological indexes of quinoa were best.The results of subordination function showed that the growth and salt-resistance of quinoa under different treatment conditions were S1>S2>S3,PAM_(0)>PAM_(30)>PAM_(10)>PAM_(20),indicating the concentrated application of PAM on soil surface was the best way to alleviate the adverse effects of salt stress on quinoa.