CAJ | 학술논문

虎尾草是一种耐盐碱性很强的天然牧草，在吉林省长岭县盐碱化草地上随机选择45个虎尾草天然种群样点，测量每个样点的土壤电导率、pH、缓冲量3个因素作为反映土壤盐碱化程度的胁迫强度指标，在每个样点上测量虎尾草茎叶中有机酸含量作为反映植物生理响应的胁变指标，进行回归分析。结果表明：虎尾草茎叶大量积累柠檬酸、苹果酸、草酸以及总有机酸以响应强盐碱胁迫且与三胁迫因素呈显著正相关，仅积累量较低的琥珀酸相反。多元回归分析发现土壤电导率对除了琥珀酸之外的其他有机酸积累影响最大，电导率可以作为天然盐碱化土壤环境下考察虎尾草响应盐碱胁迫的主要胁迫因素。
호미초시일충내염감성흔강적천연목초，재길림성장령현염감화초지상수궤선택45개호미초천연충군양점，측량매개양점적토양전도솔、pH、완충량3개인소작위반영토양염감화정도적협박강도지표，재매개양점상측량호미초경협중유궤산함량작위반영식물생리향응적협변지표，진행회귀분석。결과표명：호미초경협대량적루저몽산、평과산、초산이급총유궤산이향응강염감협박차여삼협박인소정현저정상관，부적루량교저적호박산상반。다원회귀분석발현토양전도솔대제료호박산지외적기타유궤산적루영향최대，전도솔가이작위천연염감화토양배경하고찰호미초향응염감협박적주요협박인소。
Chloris virgata is a native forage grass with strong salt-alkali resistance.Samples of 45 natural popu-lations of C.virgata were randomly chosen from the saline meadows in Changling County,Jilin Province.Soil electrical conductivity,pH and buffering capacity were measured in each sample area to assess the degree of soil salinization and associated plant stress.Organic acid contents in C.virgata stems and leaves were measured as plant physiological response indexes.A regression analysis was conducted incorporating incorporating both plant and soil data.C.virgata accumulated large amounts of organic acids including citric acid,malic acid and oxalic acid in response to strong salt-alkali stress,and there was a significantly positive correlation between the accumulation of citric acid,malic acid,oxalic acid and total organic acids and the three soil indexes.By con-trast,the level of amber acid was less under saline stress and was negatively correlated with the three soil inde-xes.Further multiple regression analysis showed that soil electrical conductivity was more strongly correlated with the accumulation of the plant organic acids (except succinic acid)than pH and buffering capacity.In con-clusion,soil electric conductivity can be used as a reliable indication of stress intensity faced by C.virgata plants exposed to salt-alkali stress in natural saline environments.