松嫩平原羊草草地植被退化与土壤盐渍化的关系  

THE RELATIONSHIP BETWEEN VEGETATION DEGENERATION AND SOIL SALINIZATION IN AN ANEUROLEPIDIUM CHINENSE GRASSLAND OF SONG-NEN PLAIN

作　　者：张为政[1] 

机构地区：[1]东北师范大学草地研究所

出　　处：《植物生态学报》1994年第1期50-55,共6页Chinese Journal of Plant Ecology

摘　　要：本文以羊草在群落中的重要值（ＩｍｐｏｒｔａｎｃｅＶａｌｕｅ，ＩＶ）。相对盖度（Ｃ＇）和相对地上生物量（Ｗ＇）为植波退化程度指标，以土壤电导率（ＥｌｅｃｔｒｉｃａｌＣｏｎｄｕｃｔｉｖｉｔｙ，ＢＣ）和碱化度（ＥｘｃｈａｎｇｅａｂｌｅＳｏｄｉｕｍｐｅｒｃｅｎｔａｇｅ，ＥＳＰ）为土壤盐渍度指标，探讨了它们之间的相互关系。结果表明，重要值（ＩＶ）与电导率（ＥＣ）及碱化度（ＥＳＰ）的函数关系式分别为：ＩＶ＝６０．１×０．６９￣（ＥＣ）和ＩＶ＝６４．０３×０．９７￣（ＥＳＰ）。相对盖度（Ｃ＇）与电导率（ＥＣ）及碱化度（ＥＳＰ）的函数关系式分别为：Ｃ＇＝９６．２ｘ６．５６￣（ＥＣ）和Ｃ＇＝９５．４８ｘ０．９５￣（ＥＳＰ）。随着土壤电导率（ＥＣ）和碱化度（ＥＳＰ）的增大，羊草重要值（ＩＶ）和相对盖度（Ｃ＇）呈指数曲线形式下降。并讨论了羊草生物量对土壤有机质（ＯＭ）和水解氮（Ｎ）含量的影响。羊草相对地上生物量（Ｗ＇）与土壤有机质及水解氮含量均呈直线正相关。相关系数分别为：ｒ＿（ＯＭ）＝０．６４８６￣和ｒ＿Ｎ＝０．８８０９￣。均达极显著相关水准。随着土壤有机质含量的增加，羊草生物量（Ｗ＇）呈直线上升。而土壤电导率（ＥＣ）和碱化度?The relationship between vegetation degeneration and soil salinization in an Aneurolepidium chinense grassland of Song-Nen Plain is discussed in this Paper. Importance Value(IV).Relative Coverage(C') and Relative Above-ground Biomass(W')are used as indicators of vegetation degeneration, Ele-ctrical Conductivity(EC)and Exchangeable Sodium Percentage (ESP) are used as indices of soil salinization.The relationships among IV,C',EC and ESP can be best described by IV=60.1x0.69￣(EC),IV =64.03 x 0.97￣(ESP),C'=95.48 x0.95￣(ESP),and C'=96.2 x 0.56￣(EC), respectively. This suggests that IV and C'are negatively correlated with EC and ESP of the soil.It is shown that W'is positively correlated with both soil organic matter(OM)and hydrolyzable nitrogen(N) contents(r_(OM)=0.6486￣**, and r_N= 0.8809￣**).Both EC and ESP can be described as a function of OM. The regression equations are EC=8.84 x0.85￣(OM) and ESP= 38.93 × 0.96￣(OM),respectively. The results indicate that the saline soils of Song-Nen Plain can be effectively ameliorated by increasing soil organic matter and nitrogen inputs.

关 键 词：植被 退化 土壤盐渍度 草原 羊草 

分 类 号：Q948.158[生物学—植物学]