土壤含水量和电导率对芦苇生长和种群分布的影响  

Effects of Soil Moisture and Electrical Conductivity on Growth and Population Distribution of Phragmites australis

作　　者：杨帆[1] 邓伟[1] 杨建锋[1] 章光新[1] 李秀军[1] 

机构地区：[1]中国科学院东北地理与农业生态研究所,长春130012

出　　处：《水土保持学报》2006年第4期199-201,共3页Journal of Soil and Water Conservation

基　　金：国家自然科学基金项目(40501010);中国科学院知识创新工程重大项目(KZCX1-SW-19)资助

摘　　要：在对芦苇小区调查取样的基础上,利用Pearson关联分析法研究了土壤水、电导率与芦苇生长和种群分布的关系。结果表明土壤电导率空间变率明显,最大值是最小值的2倍。芦苇小区土壤电导率超过110 m S/m,且pH值大于10时,芦苇由单一种群落转变成伴生种群落(芦苇+碱茅)。并随着电导率和pH值的增加,碱茅所占的比例增加。土壤电导率与芦苇生长指标(覆盖度、平均株高、生物量干重、鲜重)呈显著性相关(p<0.01),说明土壤盐分是影响芦苇种群特征的重要因素。表层土壤含水量(10 cm剖面)与芦苇生长指标中的覆盖度、生物量呈显著性相关(p<0.05)。深层含水量(100 cm剖面)与芦苇生长指标均呈显著性相关(p<0.05),因此表层水和深层水对芦苇的生长具有重要作用。The correlation between growth and population distribution of Phragmites australis and soil moisture and electrical conductivity were investigated using Pearson correlative analysis. The result presented that spatial variation of ECnis obvious, the maximum of ECn is two times of the minimum. When ECn is higher than 110 mS/ m, pH is higher than 10, Phragmites australis change from single population to mixture population （Phragmites australis ＋Puccinellia distans ）. Percentage of Puccinellia distans in mixture community increase with increasing ECnand pH. Population coverage, mean height, fresh biomass and dry biomass are correlated with soil electrical conductivity, their Pearson correlation coefficients are -0. 598,-0. 567,-0. 714,-0. 617,respectively. So soil salinity is important impact factor for Phragmites australis population. Soil moisture is significant correlation with coverage and biomass in 10 cm depth of soil profile （p 〈0. 05）. Soil moisture is significant correlation with coverage, mean height and biomass in 100 cm depth of soil profile （p 〈0. 05）. So soil moisture of surface layer and deeplayer soil profile are very important for Phragmites australis population growth.

关 键 词：土壤含水量 土壤电导率 芦苇 吉林 

分 类 号：S152.7[农业科学—土壤学] Q945.17[农业科学—农业基础科学]