艾比湖湿地不同植物群落下土壤水盐空间变异性

以艾比湖湿地为研究区,运用传统统计学和地统计学相结合的方法对4种典型植物群落下土壤水盐含量变化进行了研究。结果表明:(1)4种植物群落中,碱蓬群落、盐节木群落和梭梭群落土壤含盐量呈中等变异,而芦苇群落土壤水盐则呈现较强的差异性(2)随着土层深度的增加,盐节木群落和梭梭群落中土壤含水量差异性不大,碱蓬群落和芦苇群落则呈下降趋势,而对于土壤盐分,除梭梭群落外,其余3种植物群落各土层盐分呈降低趋势,且表层盐分含量相对较高(3)在空间结构性分析中,不同植物群落下土壤含水量和盐分在一定区域范围内空间特结构性显著,能较好地满足高斯模型分布,由于受气候、距湖距离、湖面积波动及土壤类型等因素作用,4种植物群落中土壤含水量和盐分均具有较强的空间自相关性(4)对土壤水盐含量变化的相关性分析中,4种植物群落下土壤水盐含量与其关联性都相对较小,其中碱蓬群落和芦苇群落呈正相关关系,盐节木群落和梭梭群落呈负相关关系。总体来说,碱蓬群落和芦苇群落土壤水盐总变异趋势大于梭梭群落和盐节木群落,说明距湖远近对土壤水盐空间变化有一定的影响。

Spatial Variability of Soil Moisture and Salinity in Different Plant Communities in Ebinur Lake Wetland

Spatial variability of soil moisture and salinity in four typicalplant communities in the Ebinur Lake wetland was analyzed by traditional statistics and geo-statistics methods.The results indicate that:(1)Apart from the strong variability in the Phragmites community,soil moisture and salinity are of medium variation in the other plant communities;(2)With soil depth increasing,the variability of soil moisture in the Haloxylon ammodendron community and Halocnemum strohilaceum community shows no obvious change while that of Suaeda salsa community and Phragmites community goes declining.As for soil salinity,apart from the Haloxylon ammodendron community,the variability of soil salinity was reduced gradually from top to bottom in the other plant communities with the high salt content in the surface layer;(3)The spatial strut tural analysis shows that the distribution of soil moisture and salinity is well accorded to the Uaussian model in certain areas with strong spatial autocorrelation affected by climate condition,distance from the lake,area fluctuation of the lake and soil types of four plant communities;(4)As for the correlations of the soil moil ture and salinity among four kinds of plant communities,all correlations are relatively small,of which correlation between Suaeda salsa community and Phragmites community is positive,and that between Halocnemum strohilaceum community and Haloxylon ammodendron community was negative.The variabilities of soil moisture and salinity in the Suaeda salsa community and Phrahmites community are generally bigger than those in the Haloxylon ammodendron community distance from the lake adffected spatial variability and Halocnemum strobilaceum community showing that of soil moisture and salinity.