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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Intensified Precipitation Seasonality Reduces Soil Inorganic N Content in a Subtropical Forest: Greater Contribution of Leaching Loss Than N2O Emissions
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Intensified Precipitation Seasonality Reduces Soil Inorganic N Content in a Subtropical Forest: Greater Contribution of Leaching Loss Than N2O Emissions

机译：强化沉淀季节性降低了亚热带森林中的土壤无机N含量：浸出损失的贡献比N2O排放更大

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摘要

Soil nitrogen (N) loss has been predicted to intensify with increased global precipitation changes. However, the relative contributions of leaching and gaseous N emissions to intensified N losses are largely unknown. Thus, we simulated intensified precipitation seasonality in a subtropical forest by extending the dry season via rainfall exclusion and increasing the wet-season storms via irrigation without changing the total annual precipitation. Extending the dry season length increased the monthly mean soil NO_3 ~- content by 25%-64%, net N mineralization rate by 32%-40%, and net nitrification rate by 25%-28%. After adding water in the wet season, the monthly NO_3 ~- leaching was enhanced by 43% in the relatively dry year (2013, 2,094-mmannual rainfall), but reduced by 51% in the relatively wet year (2014, 1,551 mm). In contrast, the monthly mean N_2O emissions were reduced by 24% in 2013 but increased by 78% in 2014. Overall, the annual inorganic N content was decreased significantly by the precipitation changes. Decrease of soil inorganic N might be linked to the enhanced NO_3 ~- leaching in 2013, and be linked to the increased N_2O emissions in 2014. However, in both years the annual total amount of N lost through leaching was significantly greater than that through N_2O emissions. The enhanced N_2O emissions driven by wet-season storms were correlated with an increase in nirS abundance. Our results suggest that increased frequency of droughts and storms will decrease soil inorganic N content in warm and humid subtropical forests mainly through enhanced leaching losses.
机译：预计土壤氮（N）损失将加剧全球降水变化。然而，浸出和气态N排放的相对贡献在很大程度上是未知的。因此，我们通过通过降雨排除延长干燥季节并通过灌溉增加湿季暴风雨，模拟亚热带森林中的加剧季节性。延长干燥季节长度将月均均匀增加25％-64％，净矿化率为32％-40％，净硝化率为25％-28％。在湿季加水后，每月NO_3〜 - 浸出量在相对干燥的年度（2013年，2,094-曼的降雨）中增强了43％，但在相对潮湿的一年中减少了51％（2014,1551毫米）。相比之下，2013年每月意味着N_2O排放量减少了24％，但2014年增加了78％。总体而言，降水变化的年度无机N含量显着下降。土壤无机的减少可能与2013年增强的NO_3〜 - 浸出有关，并与2014年的N_2O排放量增加。然而，在通过浸出的年度N损失的年度总量的总金额明显大于通过N_2O的全部总量排放。由湿季风暴驱动的增强的N_2O排放与NIRS丰富的增加相关。我们的研究结果表明，旱灾和风暴的频率增加将在温暖和潮湿的亚热带林中减少土壤无机N含量，主要通过增强的浸出损失。

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    Jie Chen; Yakov Kuzyakov; G. Darrel Jenerette; Guoliang Xiao; Wei Liu; Zhengfeng Wang; Weijun Shen;

  • 作者单位

    Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems South China Botanical Garden Chinese Academy of Sciences Guangzhou China;

    Department of Soil Science of Temperate Ecosystems Department of Agricultural Soil Science University of G?ttingen G?ttingen Germany;

    Department of Botany and Plant Sciences University of California Riverside California USA;

    Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems South China Botanical Garden Chinese Academy of Sciences Guangzhou China;

    Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems South China Botanical Garden Chinese Academy of Sciences Guangzhou China;

    Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems South China Botanical Garden Chinese Academy of Sciences Guangzhou China;

    Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems South China Botanical Garden Chinese Academy of Sciences Guangzhou China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生物分布与生物地理学;
  • 关键词

    Intensified Precipitation; Seasonality Reduces; Soil Inorganic;

    机译：增强降水;季节性降低;土壤无机;

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