喀斯特槽谷顺/逆向坡不同植被恢复下土壤微团聚体特征  

Characteristics of soil micro-aggregates under different vegetation restoration on consequent/reverse slopes of karst trough and valley

作　　者：曾江敏 何丙辉 苏锋 李少华 冯梦蝶 毕赟斐 谢荣仙 黎俊敏 ZENG Jiangmin;HE Binghui;SU Feng;LI Shaohua;FENG Mengdie;BI Yunfei;XIE Rongxian;LI Junmin(College of Resources and Environment,Southwest University,Key Laboratory of Eco-environments in Three Gorges Reservoir Region,Ministry of Education,Chongqing 400715,China;Water Conservancy project Quality Supervision station,Hechuan District,Chongqing 401520,China)

机构地区：[1]西南大学资源环境学院/三峡库区生态环境教育部重点实验室,重庆400715 [2]重庆市合川区水利工程质量监督站,重庆401520

出　　处：《中南林业科技大学学报》2019年第10期109-115,共7页Journal of Central South University of Forestry & Technology

基　　金：国家自然科学基金(41771312);国家重点研发计划项目(2016YFC0502303)

摘　　要：为研究喀斯特槽谷顺、逆向坡不同植被恢复对土壤结构的影响,采用野外调查和室内分析相结合的方法,对比分析了喀斯特槽谷区顺、逆向坡面不同植被(林地、花椒地、灌草地)下的土壤理化性质和微团特征。结果表明:1)顺向坡土壤微团聚体优势粒级为1~0.25 mm,分形维数D在2.62~2.64之间;逆向坡土壤微团聚体优势粒级为0.05~0.01 mm,分形维数D在2.64~2.66之间。顺向坡1~0.25 mm粒径微团聚体含量显著大于逆向坡,其余粒径含量均小于逆向坡(P<0.05),顺向坡土壤微团聚体结构稳定性比逆向坡好。2)顺向坡林地土壤微团聚体优势粒级为1~0.25 mm,花椒地和灌草地土壤微团聚体优势粒级均为0.05~0.01 mm;逆向坡3种植被恢复下土壤微团聚体优势粒级均为0.05~0.01 mm。顺向坡土壤微团聚体分形维数D为灌草地>林地>花椒地;逆向坡为花椒地>灌草地>林地。3)土壤微团聚体分形维数与<0.001 mm粒径拟合度最好(R2=0.974),与0.05~0.01 mm粒径拟合最差,且与<0.001 mm粒径微团聚体含量极显著正相关(P<0.01),与0.005~0.001 mm粒径微团聚体含量显著正相关(P<0.05),并随1~0.25 mm粒径微团聚体含量的增加而减小,随土壤全钾、有机质、粉粒含量的增加而显著减小,随MWWSA的增大而显著增大。研究结果可为喀斯特槽谷区植被恢复选择及土壤抗蚀性评价和肥力评估提供理论参考。In order to study the effects of different vegetation restoration on soil structure on the consequent and reverse slopes of Karst trough-valley region,the physical and chemical properties and micro-aggregate characteristics of soil under different vegetation(forest land,pepper land,shrub grassland)on the slope in the karst trough-valley region were compared and analyzed by means of field investigation and indoor analysis.The results showed that:(1)the dominant particle size of soil micro-aggregates was 1-0.25 mm in the consequent slope,and the fractal dimension D was between 2.62-2.64;the dominant particle size of soil micro-aggregates in the reverse slope was 0.05-0.01 mm,and the fractal dimension D was between 2.64-2.66.The content of micro-aggregates with diameter of 1-0.25 mm in the consequent slope was significantly higher than that in the reverse slope,while the content of other micro-aggregates in the consequent slope was lower than that in the reverse slope(P<0.05).The structural stability of soil micro-aggregates in the consequent slope was better than that in the reverse slope.(2)The dominant grain size of soil micro-aggregates was 1-0.25 mm in consequent slope forest land,0.05-0.01 mm in pepper land and shrub grassland,and 0.05-0.01 mm in reverse slope under three vegetation restoration.The fractal dimension D of soil microaggregates on the consequent slope was shrub grassland>forest land>pepper land,and on the reverse slope was pepper land>shrub grassland>forest land.(3)The fractal dimension of soil micro-aggregates was best fitted to<0.001 mm particle size(R2=0.974),worst fitted to 0.05-0.01 mm particle size,and was positively correlated with<0.001 mm particle size(P<0.01),and significantly positively correlated with 0.005-0.001 mm particle size through micro-aggregate content(P<0.05),and decreased with the increase of 1-0.25 mm particle size throughmicro-aggregate content,anddecreased significantly with the increase of total potassium,organic matter and silt content in soil,and increased significant

关 键 词：喀斯特 林草措施 土壤微团聚体 分形特征 回归模型 

分 类 号：S714.7[农业科学—林学]