城市不同地表覆盖类型对土壤呼吸的影响

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 城市不同地表覆盖类型对土壤呼吸的影响 DOI: 10.5846/stxb201303290548 作者: 作者单位: 中国矿业大学(北京)化学与环境工程学院,中国农业大学生物学院,中国科学院生态环境研究中心城市与区域生态国家重点实验室,中国科学院生态环境研究中心城市与区域生态国家重点实验室,中国科学院生态环境研究中心城市与区域生态国家重点实验室,中国矿业大学(北京)化学与环境工程学院 作者简介: 通讯作者: 中图分类号: S731.2 基金项目: 国家自然科学基金资助项目(71273254, 30970507) Impacts of different surface covers on soil respiration in urban areas Author: Affiliation: School of Chemical and Environmental Engineering, China University of Mining and Technology,,State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences,State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences,State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences,School of Chemical and Environmental Engineering, China University of Mining and Technology Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:采用Licor-6400-09的土壤呼吸测量系统对北京市区3种不同覆盖类型地表(全硬地表、半透砖地表、草坪覆盖地表)的土壤呼吸速率及其影响因子进行了测定和分析。结果表明:(1)不同地表覆盖类型的土壤呼吸速率年均值分别为7.928 μmol·m-2·s-1(全硬地表),5.592 μmol·m-2·s-1(部分硬化地表)、2.625 μmol·m-2·s-1(草坪覆盖地表);土壤呼吸日均值最高均出现在夏季(14.785,10.296,5.143 μmol·m-2·s-1),最低为冬季(0.490,0.319,0.239 μmol·m-2·s-1);(2)3种地表类型的土壤呼吸速率有显著差异(P<0.05),大小排序为:草坪覆盖地表<部分硬化地表<全硬地表;(3)3种地表类型土壤呼吸速率均与土壤温度呈显著的指数相关,Q10值排序为:草坪覆盖地表<部分硬化地表<全硬地表;(4)土壤含水率和土壤电导率与土壤呼吸均有一定的相关性,但关系较为复杂,有待于进一步研究。 Abstract:Urban soils are one of the most important components of urban ecosystem, which provides significant ecosystem services.The surface hardening resulted from rapid urbanization and industrialization changes the material and energy exchanges between the soil and the atmosphere, changes the physical and chemical properties of soils, changes the richness and diversity of species, leads to the deterioration of urban communities environment, and affect the urban environment and ecosystem services.Soil respiration intensity, as one of the most important indicators of soil fertility, soil texture and soil permeability, is one of the key factors of the carbon cycle in terrestrial ecosystems.The supply capacity of soil nutrients is not only reflected by the level of soil respiration, but also affected by the local ecosystem primary productivity.Therefore, the study of impacts of different land covers on soil respiration rate is important for carbon cycle in urban areas.In this paper, the surface hardening is divided into full and part built-up lands, and the soft-cover land with grass is chosen as the contrast.Combining on-site sampling method with field experiments, the response mechanism of ecophysiology of soil respiration in urban areas with different surface hardening is investigated.This research aims to explore the service and stress response mechanism between soil respiration and urban environment, clarify the response mechanism and its difference under different surface hardening types, and reveal the coupling relationship and effecting mechanism between soil respiration and environmental factors.This study can provide scientific experimental parameters for improvement of ecological benefits of urban plants and optimization of urban land structure for ecosystem services, which has important theoretical and practical significance to urban ecosystems.The rapid development of urbanization makes the urban land use types changed in much degree.The original natural landscape is replaced by so many artificial buildings.Soil respiration in urban areas is one part of the terrestrial carbon flux, which is very of importance to ecosystems.Therefore, study spatial and temporal variability of soil respiration on different surface covers in urban areas and its effects on urban environment and ecosystem services is of great significance.In this article, using Licor-6400-09 soil chamber system to measure soil respiration and its main regulating factors on the three different types of urban surface covers (totally impervious cover(TIC), partially impervious cover(PIC)) and turf surface cover(TC) in Beijing, China.The results indicated that: (1) The mean annual soil respiration rate in TIC, PIC, and TC was 7.928, 5.592 and 2.625 μmol·m-2·s-1, respectively.The maximum of 14.785, 10.296, and 5.143 μmol·m-2·s-1in Summer, and the minimum of 0.490, 0.319, and 0.239 μmol·m-2·s-1 in Winter, respectively.(2) The mean soil respiration rate was significantly different among the three different land covers (P<0.05).The order of the mean soil respiration rate was: TC< PIC< TIC.(3) Soil respiration was significantly correlated to soil temperature on the three different types of urban surface covers, The order of Q10 value was: TC< PIC< TIC.(4) Soil respiration was significantly correlated to soil moisture and soil conductivity, but it is very complicated, which needs to be further studied in the future. 参考文献 相似文献 引证文献