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作 者 ：张为政

期 刊 ：植物生态学报 1994年 18卷 1期 页码：50-55

关键词：植被退化；土壤盐渍化；重要值；电导率；碱；

Keywords:Vegetation degeneration, Soil salinization, Importance value, Electrical conductivity, Exchangeable so,

摘 要 ：本文以羊草在群落中的重要值(Importance Value，Ⅳ)。相对盖度(C′)和相对地上生物量(W′)为植被退化程度指标，以土壤电导率(E1ectrical Conductivity，EC)和碱化度(Exchangeable Sodium percentage，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＝60.1×0.69EC和Ⅳ＝64.03×0.97ESP。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′＝96.2×0.56EC和C′=95.48×0.95ESP。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： rOM=0.6486**(和rN=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(ESP)则呈指数曲线形式迅速下降。它们之间的函数关系可用：EC=8.84×0.85OM和ESP=38.93×0.96OM来表示。研究结果证明，提高土壤肥力，恢复植被，改善植物生长状况，增加草地生物量积累和土壤有机质含量，是松嫩平原盐渍土改良治理的有效途径。

Abstract: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. Electrical 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=60.1 × 0.69EC, Ⅳ =64.03 ×0.97ESP, C′ =95.48 ×0.95ESP, and C′=96.2×0.56EC, 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 hydrolysable nitrogen (N) contents (rOM=0.6486** and rN=0.8809**). Both EC and ESP can be described as a function of OM. The regression equations are EC = 8.84 × 0.85OM and ESP= 38.93 ×0.96OM, respectively. The results indicate that the saline soils of Song-Nen Plain can be effectively ameliorated by increasing soil organic matter and nitrogen inputs.

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