摘要
【目的】为研究岷江上游人工植被恢复下土壤养分及土壤质量状况。【方法】本研究以人工植被恢复措施5年后的高石砾弃渣边坡、原生植被自然边坡、高石砾弃渣场边坡为对象,测定了土壤容重、pH、饱和水含量、毛细管孔隙度、总孔隙度、有机碳、全氮、全磷、速效钾和有效磷含量等理化指标,分析了土壤化学计量特征,采用土壤质量综合指数法对土壤质量进行了评价。【结果】(1)人工植被恢复弃渣场土壤容重显著低于弃渣场边坡,土壤理化指标(土壤饱和水含量、毛细管孔隙度、总孔隙度、有机质含量、总氮含量、全磷含量、速效钾含量和有效磷含量)显著高于原生植被自然边坡和弃渣场边坡,说明人工植被恢复改善了土壤结构,提高了土壤养分含量。(2)人工植被恢复弃渣场土壤N∶P和C∶P显著高于弃渣场,土壤化学计量比处理平衡状态,不受C和P的限制。(3)土壤综合指数为植被恢复的弃渣坡面>原生植被坡面>弃渣场。【结论】表明人工植被恢复能改善土壤质量,在高石砾弃渣边坡治理土壤环境的改善中发挥了积极作用。
【Objective】In order to study soil nutrients and soil quality in the process of vegetation restoration at the upper reaches of Minjiang River,the dumping sites with vegetation restoration in 5 year(DSV),the natural site(NS),and the dumping sites(DS)with high gravel were chosen as the study sites.【Method】The physical and chemical indexes including soil bulk density,pH,capillary porosity,total porosity,soil organic carbon,total nitrogen,total phosphorus,available potassium,available phosphorus content and soil stoichiometric characteristics was determined.Soil quality comprehensive index method was used to evaluate soil quality.【Result】(i)the soil bulk density of the DSV was significantly lower than that of DS,while the soil physical and chemical indexes of the DSV were higher than that of DS and NS,which suggested that vegetation restoration improved soil structure and increased soil nutrient content;(ii)Soil N∶P and C∶P increased significantly in the DSV with equilibrium soil stoichiometric ratio,which was not restricted by C and P;(iii)the soil quality comprehensive index decreased in the order of DSV>NS>DS.【Conclusion】The results indicates that vegetation restoration has a positive effect on soil quality improvement and plays a positive role in improving soil environment in the dumping sites with high gravel.
作者
杨阳
丁建林
石福孙
白景文
向双
杨燕
YANG Yang;DING Jian-lin;SHI Fu-sun;BAI Jing-wen;XIANG Shuang;YANG Yan(Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Sichuan Chengdu 610041,China;Chengdu Institute of Biology,Chinese Academy of Sciences,Sichuan Chengdu 610041,China)
出处
《西南农业学报》
CSCD
北大核心
2021年第3期597-603,共7页
Southwest China Journal of Agricultural Sciences
基金
2018年度四川省环境治理与生态保护重大科技专项“重大工程受损生态系统修复技术构建与示范”(2018SZDZX0033)
四川省科技计划项目“快速高通量真空赶酸仪的研制”(2019YFG0332)。
关键词
岷江上游
植被恢复
高石砾弃渣边坡
土壤理化指标
化学计量特征
土壤质量评价
Minjiang River
Vegetation restoration
Dumping sites with high gravel
Physical and chemical indexes
Soil stoichiometric
Soil quality evaluation
