腾格里沙漠植被重建对土壤呼吸的影响
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国家重点基础研究发展计划(2009CB421303)和国家自然科学基金项目(40501004)资助


Effects of revegetation on soil respiration in the Tengger Desert
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    摘要:

    植被重建是防止和控制沙漠化的有效措施之一。为探讨腾格里沙漠植被重建对土壤呼吸的影响,利用Li-6400-09土壤呼吸室于2007年观测了1989年建立的植被重建区和流沙区土壤呼吸差异,并采用根系隔离法区分了植被重建区的土壤基础呼吸和根际呼吸。结果表明,植被重建18 a 显著影响了该区土壤CO2的释放过程,总土壤呼吸速率由流沙区的CO2 0.107±0.008 μmol m-2 s-1显著增加到植被区CO2 0.483 ± 0.033μmol m-2 s-1,而且出现了较为明显的季节波动。植被重建不但导致根际呼吸速率增加,而且影响了土壤基础呼吸速率。此外,植被重建区灌木的缀块状分布格局和养分的空间异质性导致了土壤呼吸的空间差异.

    Abstract:

    Revegetation is one of the most effective means to prevent and control soil desertification. To investigate effects of revegetation on soil respiration in the Tengger Desert, the technique of Li-6400-09 soil respiration chamber was adopted in measuring soil respiration rates of an area revegetated in 1989 and a shifting sand area, and the root-partitioning techniques in separating rhizospheric respiration from soil basal respiration. Results show that soil CO2 efflux was significantly affected by the vegetation restoration. The total soil respiration rate was found be significantly increased from 0.107±0.008 μmol m-2 s-1 to 0.483 ± 0.033 μmol m-2 s-1 and obvious seasonal fluctuation of the rate was observed. The revegetation not only greatly enhanced rhizospheric respiration rate, but also dramatically increased basal respiration rate through improving soil surface environment, capturing dust, and developing cryptogamic crusts. Furthermore, the patchy distribution of shrubs and spatial heterogeneity of soil nutrients in the revegetated area led to spatial heterogeneity of the soil respiration therein .

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高艳红,张志山,刘立超,贾荣亮.腾格里沙漠植被重建对土壤呼吸的影响[J].土壤学报,2009,46(4):626-633. DOI:10.11766/trxb200804030409 Gao Yanhong, Zhang Zhishan, Liu Lichao, Jia Rongliang. Effects of revegetation on soil respiration in the Tengger Desert[J]. Acta Pedologica Sinica,2009,46(4):626-633.

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