蒋家沟泥石流堆积扇不同植被类型区土壤抗蚀性评价  

Evaluation of soil anti-erodibility of different vegetation types in debris flow fans of Jiangjiagou Valley

作　　者：刘忆南 申振宏 都都 张知然 林勇明[1,2] LIU Yinan;SHEN Zhenhong;DU Du;ZHANG Zhiran;LIN Yongming(College of JunCao Science and Ecology,Fujian Agriculture and Forestry University,Fuzhou 350002,China;Key Laboratory for Forest Ecosystem Process and Management of Fujian Province,Fuzhou 350002,China;College of Computer and Information Sciences,Fujian Agriculture and Forestry University,Fuzhou 350002,China)

机构地区：[1]福建农林大学菌草与生态学院,福州350002 [2]福建省高校森林生态系统过程与经营重点实验室,福州350002 [3]福建农林大学计算机与信息学院,福州350002

出　　处：《应用与环境生物学报》2024年第5期886-893,共8页Chinese Journal of Applied and Environmental Biology

基　　金：国家自然科学基金项目(42071132);瓮福紫金化工股份有限公司项目(KF2023076)资助。

摘　　要：土壤抗蚀性与土壤理化性质密切相关,可以指示生态恢复过程中土壤性质的变化趋势,其研究可促进土壤侵蚀控制与水土流失防治.选择昆明市东川区蒋家沟泥石流堆积扇6种典型植被类型土壤为研究对象,基于野外采样和实验室数据处理,采用主成分分析法对研究区土壤抗蚀性指标进行综合分析以评价土壤抗蚀性.结果表明:(1)相比其他5种植被类型,裸地土壤总孔隙度、含水量、持水量、有机质和全氮含量均表现为最低,容重表现为最高,表明裸地土壤结构和质量相对较差.(2)蒋家沟泥石流堆积扇不同植被类型区土壤抗蚀性综合指数大小表现为桉树林地>玉米地>扭黄茅草地>新银合欢林地>山蚂蝗灌丛地>裸地.(3)描述研究区土壤抗蚀性的12个指标可简化为总孔隙度、土壤含水量、土壤容重、毛管持水量、有机质含量和抗蚀指数6个指标,并与土壤抗蚀性综合指数回归拟合,得到最佳线性模型:Y=0.181X_(1)+0.058X_(4)-1.342X_(5)+0.213X_(7)+0.115X_(9)+0.082X_(12)+2.191.综上,蒋家沟泥石流堆积扇的植被恢复对土壤抗蚀性有一定的改善作用,桉树林地、玉米地、扭黄茅草地的改善效果显著优于新银合欢林地、山蚂蝗灌丛地,该结果可为干热河谷区泥石流堆积扇植被恢复、土壤改良以及生态重建提供基础数据和理论支撑.(图2表7参40)Soil anti-erodibility is closely related to soil physical and chemical properties.Erodibility studies can reveal trends in the changes in soil properties during ecological restoration and promote soil erosion control and prevention.The soils of six typical vegetation types in debris flow fans of Jiangjiagou Valley in Dongchuan District,Kunming City,were selected as research objects.To evaluate soil anti-erodibility,a comprehensive analysis of soil anti-erodibility indicators was performed using principal component analysis through field sampling at the study site and laboratory data processing.The results revealed the following facts:(1)Compared with the other five vegetation types,soil total porosity,water content,water-holding capacity,organic matter,and total nitrogen content of bare land were the lowest among all six types,whereas unit weight was the highest,indicating that the soil structure and quality of bare land were relatively poor.(2)The comprehensive soil antierodibility indices of different vegetation types in the debris flow fans of Jiangjiagou Valley followed the order of:Eucalyptus robusta forest>cornland>Heteropogon contortus grassland>Leucaena leucocephala forest>Desmodium racemosum shrub>bare land.(3)The 12 indicators characterizing soil anti-erodibility at the study site can be simplified into six indicators:total porosity,soil water content,soil unit weight,capillary waterholding capacity,organic matter content,and anti-erodibility index.The optimal linear model was obtained by regression fitting with a comprehensive index of soil anti-erodibility:Y=0.181X_(1)+0.058X_(4)-1.342X_(5)+0.213X_(7)+0.115X_(9)+0.082X_(12)+2.191.Overall,vegetation restoration of debris flow fans in Jiangjiagou Valley improved soil anti-erodibility,and the improvement effect of Eucalyptus robusta forest,cornland,and Heteropogon contortus grassland was significantly greater than that of Leucaena leucocephala forest and Desmodium racemosum shrub.These results provide basic data and theoretical support for vegetation res

关 键 词：泥石流 堆积扇 土壤抗蚀性 植被类型 主成分分析 

分 类 号：S157.1[农业科学—土壤学]