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Soil Biol Biochem:土地利用变化过程土壤碳氮耦合机制

来源:武汉植物园 2013-12-04 13:56

森林恢复能吸收大气中的二氧化碳并将其固定在植被或土壤中,对于降低大气中温室气体浓度具有十分重要的作用。但目前国内外对此作用的评估具有很大的差异,其原因之一在于缺少对土壤碳积累过程机制的认识,特别是缺乏对土壤碳氮循环耦合机制的认识。该项研究是当前土壤科学的前沿领域。

为了揭示土地利用变化(森林恢复)对土壤碳氮循环的影响,中科院武汉植物园系统生态学课题组助理研究员邓琦在程晓莉研究员的指导下,以丹江口库区森林,灌丛和农田生态系统等不同土地利用类型为对象,系统研究了土壤有机碳及其惰性有机碳的指数,总氮、氮的净矿化及硝化和无机氮含量等碳氮循环过程。研究结果表明,由于大量低质量(高C:N比)植物凋落物的输入,森林和灌丛的植被恢复增加了土壤有机碳,但减少了土壤的总氮含量,进而导致更高的土壤C:N比和土壤惰性有机碳的指数。改变土壤C:N比以及土壤有机碳组分还进一步影响来土壤氮循环。森林恢复显著降低土壤氮的净矿化和硝化速率,以及无机氮含量。相关分析表明,土壤氮矿化和硝化与土壤有机碳和土壤碳氮比呈负相关关系。该研究不仅揭示了丹江口库区土壤碳氮动态对于森林恢复的响应,同时还阐述了森林恢复过程中土壤碳氮耦合的机制,为当地政府的植被恢复和库区水环境治理工作提供了可靠的科学依据和借鉴。

该研究得到了国家自然科学基金及中国科学院战略性先导专项的资助,相关研究成果发表在国际生态学期刊Soil Biology & Biochemistry上。(生物谷Bioon.com)

生物谷推荐的英文摘要

Soil Biology and Biochemistry             doi.org/10.1016/j.soilbio.2013.10.053

Carbon–nitrogen interactions during afforestation in central China

Qi Denga, 1, Xiaoli Chenga,Yuanhe Yangb, Quanfa Zhanga, Yiqi Luoc

We conducted a field study in Danjiangkou Reservoir region of central China to evaluate soil C and N dynamics following afforestation by comparing soil organic C and N (SOC and SON), soil net N mineralization and nitrification, and inorganic N concentrations in the plant rhizosphere and open areas in the forest, shrubland and adjacent cropland. Afforestation increased SOC but did not significantly affect SON in the plant rhizosphere. Due to large quantity of low-quality litter (with high C:N ratios) inputs, afforestation enhanced soil C recalcitrant indexes (RIC) but decreased soil N recalcitrance indexes (RIN) in the plant rhizosphere. Both SON and RIN significantly decreased following afforestation in the open areas. Afforestation decreased inorganic N concentrations and net N mineralization. Soil net N mineralization were negatively correlated with soil C:N ratios across land use types. These results suggest that afforestation could increase SOC stocks resulting from large low-quality litter input, but over the long-term, this increase was likely limited due to decreased soil N availability.

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