艾比湖湿地典型植物群落下土壤有机质空间变异性研究

A study on spatial variability of soil organic matters under typical plant communities in the wetland of Lake Ebinur

以具有特殊气候和成土母质的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有机质含量变化进行研究。结果表明:(1)不同季节下4种植物群落土壤有机质含量变异系数均为中等变异;(2)随着土层深度的增加,碱蓬群落下各层土壤有机质含量在0—5 cm和50—60 cm较高,芦苇群落和盐节木群落各层土壤有机质含量在10—20 cm较高,梭梭群落下各层土壤有机质在一定区域范围内空间特征性显著,且植物群落中土壤有机质含量均具有较强的空间相关性,5月芦苇群落的变异程度大于其他植物群落。总体来说,不同季节芦苇群落下土壤有机质的空间变异范围均较大,说明距湖远近对土壤有机质空间具有一定的影响。

Selected the wetland in Lake Ebinur with special climate and soil parent material as the studied area in the paper, we analyzed the variations of soil organic matter content in four typical plant communities by using the traditional statistics and geo-statistics methods. The results showed that：（1） The differentiate coefficient of local soil organic matter content in the four plant communities displayed a moderate variation with different seasons.（2） With the increase of the soil depth, the soil layers with higher content of organic matter in Suaeda salsa community were at the depth of 0-5 cm and 50-60 cm, while those were at the depth of 10-20 cm in Phragmites community and Halocnemum strobilaceum community. The soil organic matter content in Haloxylon ammodendron community showed significant spatial characteristics in certain areas and strong spatial correlation. The variation degree of soil organic matter content in Phragmites community was larger than other plant communities in May. In general, there was a large spatial variability range of soil organic matter in Phragmites community, indicating that the distance from the lakeshore had a certain impact on the spatial variability of soil organic matter.