摘要:
对广西喀斯特地区2种优势灌丛植物子凌蒲桃与火棘在不同坡位条件下根际与非根际土壤养分与pH值的分布特征进行研究,揭示植物种类及其立地条件对植物根际养分与pH值分布特征的影响.结果表明,2种植物根际养分存在一定程度的富集现象,其中,火棘根际有机碳与速效磷含量富集明显,子凌蒲桃根际有机碳与全氮含量富集明显;根际与非根际土壤养分含量在不同坡位下存在显著性差异(p<0.05);根际土壤有机碳含量与全氮含量呈显著正相关(p<0.05),与速效磷含量呈显著负相关(p<0.05);非根际土壤有机碳含量与速效磷、全氮含量呈显著正相关(p<0.05).双因素方差分析显示,与植物种类相比,坡位对根际土壤养分含量影响更大.以上的研究表明,喀斯特灌丛优势植物有利于提高该地区土壤养分利用,但应该考虑植物立地条件对根际养分利用的影响.
关键词:
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喀斯特地区
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灌木
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根际土
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土壤养分
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坡位
Abstract:
To test the effects of plant type and slope position on the distribution characteristics of nutrients and pH in plant rhizosphere and non-rhizosphere soil,two dominant shrubs (Syzygium championii and Pyracantha fortuneana) were selected in a karst region of Guangxi,Southwest China.Rhizosphere soil showed nutrients enrichment.An enrichment of soil organic carbon and available phosphorus was more pronounced in pyracanthafortuneana rhizosphere,and an enrichment of soil organic carbon and total nitrogen was also found in syzygium championii rhizosphere.Significant difference in soil nutrients among slope positions was found in shrub rhizosphere and non-rhizosphere (p<0.05).In rhizosphere soil,soil organic carbon content had significantly positive correlation with total nitrogen content and significantly negative correlation with available phosphorus content (p<0.05).In non-rhizosphere soil,soil organic carbon content had significantly positive correlations with the content of total nitrogen and available phosphorus (p<0.05).A two-factor variance analysis showed that slope position had greater effect on physico-chemical properties than plant type.The above results suggested that the dominant plants in karst shrub are beneficial to improve the utilization of soil nutrients.In addition,slope position should be considered,when shrub species were used to improve soil quality in karst regions.
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