中文摘要：

基于喀斯特峰丛洼地农作区、人工林、次生林、原生林4类典型生态系统动态监测样地（200 m×40 m）土壤矿质养分因子（7个）、植被（9个）、地形（4个）、土壤理化性状（10个）共计30个指标的全面调查取样分析,采用经典统计分析、主成分分析和典范相关分析探讨了土壤矿物质的组成特征、作用以及与植被、地形、其他土壤性状的耦合关系.结果表明：喀斯特峰丛洼地土壤矿物质组成以SiO2、Al2O3、K2O、Fe2O3为主,明显低于全球土壤平均背景值和同区域地带性红壤,CaO、MgO含量居中,MnO含量很低;不同生态系统土壤矿物质组成和变异不同,土壤的发育程度也不同,植被和土壤的原生性呈同比正相关,均有潜在的石漠化风险;4类生态系统景观异质性高,主成分分析的降维效果不好,土壤矿物质均为各生态系统的主要影响因子,且与植被、地形、其他土壤性状的关系非常密切,特别是SiO2、CaO和MnO,其中对植被的影响主要是物种多样性,对土壤则为有机质、全氮、全钾等主要养分.土壤矿物质是影响喀斯特峰丛洼地土壤肥力和植物生长发育的限制因子之一,有效利用矿物质资源、合理施用矿质养分对喀斯特退化生态系统的恢复与重建作用重大.

英文摘要：

Based on the investigation and analysis of seven soil mineral substance variables,nine vegetation factors,four topographical factors,and ten soil physicochemical factors in the 200 m×40 m dynamic monitoring plots in farmland,forest plantation,secondary forest,and primary forest in the depressions between hills in karst region,and by using traditional statistical analysis,principal component analysis（PCA）,and canonical correlation analysis（CCA）,this paper studied the compositional characteristics and roles of soil mineral substances as well as the coupling relationships between the mineral substances and the vegetation,topography,and other soil properties.In the depressions,soil mineral substances were mainly composed of SiO2,Al2O3,K2O,and Fe2O3,whose contents were obviously lower than the mean background values of the soils in the world and in the zonal red soils at the same latitudes.The soil CaO and MgO contents were at medium level,while the soil MnO content was very low.The composition of soil mineral substances and their variation degrees varied with the ecosystems,and the soil development degree also varied.There was a positive correlation between vegetation origin and soil origin,suggesting the potential risk of rock desertification.Due to the high landscape heterogeneity of the four ecosystems,PCA didn＇t show good effect in lowering dimension.In all of the four ecosystems,soil mineral substances were the main affecting factors,and had very close relationships with vegetation,topography,and other soil properties.Especially for SiO2,CaO,and MnO,they mainly affected the vegetation species diversity and the soil organic matter,total nitrogen,and total potassium.This study indicated that soil mineral substances were the one of the factors limiting the soil fertility and vegetation growth in the depressions between hills in karst region.To effectively use the soil mineral resources and rationally apply mineral nutrients would have significances in the restoration and reconstruction of karst degraded