Effects of different hydrologic managements on soil CO₂ and CH₄ emissions of the restored peatlands

PDF HTML阅读 XML下载 导出引用 引用提醒 不同水位管理对恢复泥炭地土壤CO2、CH4排放的影响 DOI: 10.5846/stxb202111013067 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金项目（U19A2042，41871081，41877075）；吉林省自然科学基金项目（20190201308JC） Effects of different hydrologic managements on soil CO2 and CH4 emissions the restored peatlands Author: Affiliation: Fund Project: National Natural Science Foundation China(U19A2042，41871081，41877075)、National Jilin Province（20190201308JC） 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:泥炭地水文条件影响泥炭地生物地球化学循环，控制和维持着泥炭地生态系统的结构和功能，是泥炭地生态恢复的重要前提。然而，目前关于恢复泥炭地土壤碳排放对不同水位的响应尚不明确。以长白山区天然（NP）、退耕（DP）及实施不同水文管理的恢复泥炭地（低水位（LR）、高水位（HR）与高低交替水位（H-LR））为研究对象，采用静态箱-气相色谱法对研究区泥炭地进行生长季（6-10月）土壤CO2、CH4排放监测。结果表明：温度和水位变化是研究区泥炭地土壤CO2、CH4排放季节变化的主控因子。H-LR受水位控制的影响，生长季土壤CO2排放速率波动剧烈，其它水位管理恢复区土壤CO2排放速率呈单峰型排放模式，且均与近地表温度呈指数相关（P<0.05）。除HR外，土壤CO2排放速率与水位呈显著负相关（P<0.05）。生长季，研究区HR土壤CH4排放速率呈双峰型，H-LR与NP的土壤CH4排放呈单峰型，与近地表温度呈指数相关（P<0.05），LR水位与CH4排放速率显著正相关（P<0.05）。研究区不同水位管理恢复泥炭地土壤碳排放差异显著，虽然HR的土壤CO2-C累积碳排放量显著低于其它水位恢复区，但其土壤CH4-C累积碳排放量和综合增温潜势显著高于其它水位恢复区（P<0.05）。LR的累积碳排放量显著低于退化泥炭地，且其综合增温潜势最低。因此，建议在泥炭地恢复初期将低水位管理作为短期策略，以更好地恢复泥炭地碳汇功能，减弱其增温潜势。 Abstract:The hydrological condition influences biogeochemical cycles maintains structures functions peatland ecosystems. Therefore, adopting appropriately management measures during restoration is important to rapid recovery ecological in peatlands. However, it unclear how carbon respond managements. In this study, effects managements, including low water level (LR), high (HR), high-low alternating (H-LR), growing season Changbai Mountains were investigated. Results showed that air temperature changes main factors affecting seasonal variation study area. As affected by control, emission rate H-LR fluctuated sharply while a unimodal curve other areas, exponentially associated with (P<0.05). Soil rates significantly negatively correlated (P<0.05) except HR. During season, HR was bimodal NP unimodal, they The LR positively There significant differences among had lowest cumulative CO2-C emission, but highest CH4-C warming potential lower than degraded its lowest. Our suggests should be taken as short-term strategy early stage better restore sink function weaken potential.