摘要
隧道在高原山岭等地区道路建设中被广泛采用,但其对土壤有机碳稳定性的影响研究较少。土壤有机碳稳定性是评价土壤生态系统对外界环境变化响应的重要指标。为阐明土壤有机碳(SOC)对隧道工程建设的抗干扰能力,本研究以雅鲁藏布江下游隧道建设为依托,设置工程影响区(ED)和非影响区(CK)监测样地,从土壤活性有机碳(LOC)、团聚体和土壤酶活性等角度探究隧道建设对SOC稳定性的影响。结果表明,工程影响区SOC、LOC含量分别为291.40和110.28 mg·kg^(-1),CK区域中分别为255.31和91.19 mg·kg^(-1),两个区域差异不显著(P> 0.05)。ED和CK中,土壤粒径> 0.25 mm的团聚体占比均超过80%,随着团聚体粒径减小,ED的SOC含量呈现降低趋势,但ED与CK差异不显著。本研究表明,隧道建设未改变植被凋落物量,对SOC的输入与输出未产生显著影响。ED与CK区土壤酶、微生物生物量碳及土壤团聚体组成无显著差异,表明隧道工程建设对SOC稳定性的微生物学调控机制及土壤团聚体物理保护机制无显著影响,对SOC稳定性无显著影响。综上,雅鲁藏布江下游隧道工程建设对土壤有机碳稳定性未产生显著影响,本研究为隧道建设对环境的影响评价提供了参考依据,也为雅鲁藏布江下游地区生态环境保护提供数据和理论依据。
Tunnels have been widely constructed in plateau mountains. However, the effects of tunnel construction on soil organic carbon stability have not been extensively studied. Soil organic carbon stability is an important indicator to evaluate the response of soil ecosystems to environmental changes. To detect the resistance of soil organic carbon(SOC) to tunnel construction in the lower Yarlung Tsangpo River tunnel, we compared the response of SOC stability to tunnel construction in the engineering impact(ED) and undisturbed(CK) areas by combining labile organic carbon(LOC), soil agglomerates, and soil enzymes. The results showed no significant differences among CK 255.31 and 91.19 mg·kg^(-1)and ED 291.40 and 110.28mg·kg^(-1)in terms of SOC and LOC contents(P > 0.05), respectively. The proportion of > 0.25 mm aggregates in all soil fractions was over 80%. With the decrease of aggregate size, the content of organic carbon in aggregate showed a decreasing trend, but no significant difference between the ED and CK areas was observed. This study showed that the tunnel construction did not change litterfall, indicating that tunnel construction did not affect the input and output of SOC.Moreover, there were no significant differences in soil enzymes, microbial biomass carbon, and soil agglomerate composition between ED and CK, indicating that the tunnel construction had no significant effect on the microbiological regulation mechanism of SOC stability and the physical protection mechanism of soil agglomerates. In conclusion, our study indicated that the tunnel construction in the lower Yarlung Tsangpo River did not have a significant effect on the stability of soil organic carbon. These findings can aid in evaluating the impact of tunnel construction on the environment and providing an important basis for ecological protection in the lower Yarlung Tsangpo River.
作者
赵润英
李凛
唐晓鹿
陈果
李景吉
曹龙熹
王国严
石松林
罗建
裴向军
ZHAO Runying;LI Lin;TANG Xiaolu;CHEN Guo;LI Jingji;CAO Longxi;WANG Guoyan;SHI Songlin;LUO Jian;PEI Xiangjun(College Ecological and Environment,Chengdu University of Technology,Chengdu 610059,Sichuan,China)
出处
《草业科学》
CAS
CSCD
北大核心
2023年第1期15-24,共10页
Pratacultural Science
基金
成都理工大学珠峰科学研究计划(80000-2021ZF11410)
雅鲁藏布江下游水电站截弯引水发电工程区生态地质环境评价与生态修复技术研究(80303-AHH110)。
关键词
雅鲁藏布江下游
隧道工程
土壤有机碳
有机碳稳定性
活性有机碳
土壤微生物生物量碳
土壤酶
土壤团聚体
lower reaches of Yarlung Zangbo River
tunnel engineering
soil organic carbon
soil organic carbon stability
reactive organic carbon
soil microbial biomass carbon
soil enzyme activities
soil aggregate
