水位涨落与土地利用对三峡水库梅溪河消落带土壤重金属含量的影响OACHSSCD
Effects of water level fluctuation and land use type on soil heavy metal contents in the water-level fluctuation zone of the Meixi River in the Three Gorges Reservoir
水位涨落直接驱动着消落带土壤生物地球化学循环过程,而土地利用作为当前人类活动的重要载体,同样对土壤生态系统产生深刻影响.为深入探讨水位涨落与土地利用方式对消落带土壤重金属含量的影响,在三峡库区腹心地带的梅溪河,采用原位调查监测方法,以库岸带为对照,对不同高程梯度、土地利用方式消落带的14种土壤重金属含量进行系统研究.结果表明:(1)梅溪河消落带土壤重金属含量的变异系数变化在0.13-0.66之间,除土壤Hg、As、Cd含量超过三峡库区土壤背景值外,其他土壤重金属总体均处于污染低风险水平.(2)水位涨落对消落带土壤As、Cr、Cd、Cu、Sb、Tl等重金属含量的影响显著(P＜0.05),与未淹水对照区相比,消落带各土层大多数重金属的含量均都增加,其中表层土壤主要受淹水时长影响,而底层土壤主要受土层深度影响.(3)土地利用方式对消落带土壤重金属含量产生一定程度影响,且因土层而异,相比自然恢复草地和农耕地,消落带人工营造林地总体更有利于减少土壤重金属富集.(4)水位涨落与土地利用方式对消落带土壤As、Cr、Pb、Sb含量的交互影响显著(P＜0.05),对土壤Co、Cd、Tl、Sn、Zn、Cu含量虽也存在交互作用,但并不显著(P＞0.05).研究结果可为三峡水库消落带生态系统修复及土地利用管理和可持续发展提供重要科学依据与参考.
The water level fluctuation directly drives soil biogeochemical cycling process in the water-level fluctuation zone(WLFZ),while land use which is a main form of human activities also has an important impact on soil ecosystem.To understand the effect of water level fluctuation and land use type on soil heavy metal contents in the WLFZ,fourteen soil heavy metals(As,Cr,Cd,Zn,Cu,Hg,Ni,Pb,Pt,Sb,Sn,Tl,Bi,Co)from different elevation gradients and land use types were systematically studied by the method of in-situ survey and monitoring in Meixi River,a core area of the Three Gorges Reservoir(TGR),using the lakeside zone as the control.The results showed that:(1)The coefficient of variation of soil heavy metal content in the WLFZ of Meixi River ranged from 0.13 to 0.66.Except for soil Hg,As,and Cd content,which exceeded the soil background value of the TGR area,other soil heavy metal contents were generally at a low-risk level of pollution.(2)Water level fluctuation significantly affected the contents of soil As,Cr,Cd,Cu,Sb,and Tl in the WLFZ(P＜0.05).Compared with the non-flooded control zone,most heavy metal contents of different soil layers increased in the WLFZ,and heavy metal contents of surface soil were mainly affected by the duration of flooding,while that of subsurface soil were primarily affected by the depth of soil layer.(3)Land use type had a certain degree of impact on soil heavy metal content in the WLFZ,with the effect differing by soil layer.Compared with natural grassland and farmland,artificial forest land in the WLFZ was generally good for reducing soil heavy metal accumulation.(4)There were significant interactive effects of water level fluctuation and land use type on contents of soil As,Cr,Pb,and Sb in the WLFZ(P＜0.05).Although interactive effects on soil Co,Cd,Tl,Sn,Zn,and Cu were also observed,they were not significant(P＞0.05).These findings provide important scientific insights for WLFZ ecosystem restoration and land use management and sustainable development in the Three Gorges Reservoir.
邓洁;王占印;王轶浩;高澳寒;杨得权;薛梦涵;郭红妍
重庆师范大学地理与旅游学院,山区生态系统碳循环与碳调控重庆市重点实验室,三峡库区地表生态过程重庆市野外科学观测研究站,重庆 401331江西省森林资源保护中心,南昌 330038重庆师范大学地理与旅游学院,山区生态系统碳循环与碳调控重庆市重点实验室,三峡库区地表生态过程重庆市野外科学观测研究站,重庆 401331重庆师范大学地理与旅游学院,山区生态系统碳循环与碳调控重庆市重点实验室,三峡库区地表生态过程重庆市野外科学观测研究站,重庆 401331重庆师范大学地理与旅游学院,山区生态系统碳循环与碳调控重庆市重点实验室,三峡库区地表生态过程重庆市野外科学观测研究站,重庆 401331重庆师范大学地理与旅游学院,山区生态系统碳循环与碳调控重庆市重点实验室,三峡库区地表生态过程重庆市野外科学观测研究站,重庆 401331重庆师范大学地理与旅游学院,山区生态系统碳循环与碳调控重庆市重点实验室,三峡库区地表生态过程重庆市野外科学观测研究站,重庆 401331
土壤重金属土地利用方式淹水时长消落带三峡水库
soil heavy metalsland-use typeflooding durationwater-level fluctuation zoneThree Gorges Reservoir
《生态学报》 2026 (5)
2509-2520,12
重庆市自然科学基金面上项目(CSTB2023NSCQ-MSX0741)重庆市教育委员会科学技术研究项目(KJQN202000502)重庆市技术创新与应用发展专项面上项目(CSTB2024TIAD-LDX0001)重庆师范大学地理与旅游学院学生创新研究项目(DL25YJSYB03)
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