湘中紫色丘陵区不同植被类型根际与非根际土壤理化特征  

Physicochemical Characteristics of Rhizosphere and Non-rhizosphere Soils Under Different Vegetation Types in Purple Soil Hilly Region of Central Hu'nan Province

作　　者：戴齐[1] 廖超林[1] 唐茹 林清美 向弘 

机构地区：[1]湖南农业大学资源环境学院,湖南长沙410128

出　　处：《水土保持通报》2017年第5期114-122,共9页Bulletin of Soil and Water Conservation

基　　金：国家自然科学基金面上项目"长期培肥水稻土微结构特征及对施肥措施改变的响应"(41571211)

摘　　要：[目的]探索湘中紫色丘陵区不同植被类型根际与非根际土壤的理化特征,为湘中地区生态修复提供理论依据。[方法]以典型抽样方法调查湘中丘陵区草丛(G)、草灌(GS)、灌木(S)和乔灌(AS)4种典型植被,研究其根际与非根际土壤理化性质的差异,通过典型相关分析揭示根际与非根际土壤理化指标间的耦合关系。[结果]研究区草丛和灌木根际土壤中细砂粒(0.25~0.05mm)含量分别显著(p<0.05)低于乔灌63.84%和76.97%;粉粒(0.02~0.002mm)含量表现为草和灌木分别显著高于乔灌的38.48%和37.66%。根际土壤0.25~0.05mm微团聚体含量均表现为乔灌高于其他植被,0.02~0.002mm微团聚体含量均表现为灌木高于其他植被。草灌与灌木非根际土壤有机质含量显著(p<0.05)低于根际土壤148.05%和121.92%,灌木和草灌根际土壤有机质含量显著(p<0.05)高于乔灌土壤84.28%和92.08%;草灌根际土壤全氮含量显著(p<0.05)高于非根际土壤83.33%,草灌根际土壤碱解氮含量显著(p<0.05)高于乔灌土壤200.83%;不同植被类型根际/非根际土壤磷含量差异不明显,总体来看,同一植被根际土壤全磷含量低于非根际土壤,而有效磷表现为乔灌最低;乔灌根际土壤速效钾含量分别显著(p<0.05)低于草丛和草灌土壤125.15%和137.71%,除草灌外,其余植被类型根际土壤全钾含量均低于非根际土壤。典范相关分析表明土壤有机质和全量养分含量,2~1,1~0.5,0.25~0.05mm土粒含量,2~1,1~0.5mm团聚体3组理化性状间相互关系密切。[结论]改善土壤理化性质,促进湘中丘陵地区生态恢复,应注重协调土壤养分、颗粒组成及团聚体之间的耦合关系。[Objective]To explore the physicochemical characteristics of rhizosphere and non-rhizosphere soils under different typical types of vegetation in purple soil hilly region of central Hunan Province,and to provide theoretical basis for ecological restoration.[Methods]The physical and chemical properties of rhizosphere and non-rhizosphere soils from grass（G）,grass-shrub（GS）,shrub（S）and arbor-shrub（AS）were obtained by sampling and experimental analysis to reveal the coupling relationships with regard to the indexes of physical and chemical properties of between rhizosphere and non-rhizosphere soils.[Results]The contents of fine sand（0.25~0.05 mm）in G and S rhizosphere soils were 76.97% and 63.84%lower that of AS（p〈0.05）.Whereas,the silt contents were 38.48%and 37.66% higher.The content of 0.25~0.05 mm microaggregatein the AS rhizosphere soil was higher than those of others and the 0.02~0.002 mm microaggregate content of S rhizosphere soil was the highest.The organic matter contents of GS and S in non-rhizosphere soil,were148.05% and 121.92%（p〈0.05）lower than the corresponding ones in rhizosphere soil.Organic matter contents in S and GS rhizosphere soils were 84.28% and 92.08%（p〈0.05）higher that of AS.The total nitrogen content in GS rhizosphere soil was 83.33% higher than that in non-rhizosphere soil.The available nitrogen in GS rhizosphere soil was 200.83% higher（p〈0.05）than that of AS.Either in rhizosphere soil or in non-rhizosphere soil,phosphorous contents had no significant differences among all types of vegetation.For the same type of vegetation,soil total phosphorous content in rhizosphere soil was lower than that in non-rhizosphere.Soil available phosphorous content in AS was the lowest.In comparison with the ones of G and GS,the available potassium content in AS rhizosphere soil was 125.15%and 137.71%lower（p〈0.05）.There were closed relationships among the three groups of soil physicochemical indices,referring to the group of soil organic matter and total nutr

关 键 词：植被 根际 土壤 

分 类 号：S151.9[农业科学—土壤学]