Dynamics of soil water extractable organic carbon and inorganic nitrogen and their environmental controls in mountain forest and meadow ecosystems in China
Dynamics of soil water extractable organic carbon and inorganic nitrogen and their environmental controls in mountain forest and meadow ecosystems in China
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DOI：
10.1016/j.catena.2019.104338
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发表时间：
2020-04
期刊：
影响因子：
6.2
通讯作者：
Junjun Zhang;C. Peng;W. Xue;Bin Yang;Zhen’an Yang;S. Niu;Qiu'an Zhu;Meng Wang
中科院分区：
文献类型：
--
作者：
Junjun Zhang;C. Peng;W. Xue;Bin Yang;Zhen’an Yang;S. Niu;Qiu'an Zhu;Meng Wang
我们调查了中国秦岭山区两种类型的森林（松林和橡树林）和草地土壤水可提取有机碳（WEOC）、铵（NH4+）和硝酸盐（NO3−）浓度的差异。结果表明，草地土壤WEOC、NH4+和NO3−浓度高于森林，松林高于橡树林。土壤表面温度和土壤含水量与WEOC和无机氮浓度呈正相关（P<0.01）。此外，土壤WEOC浓度与pH值呈显着负相关（P<0.01）。此外，土壤WEOC浓度与无机氮浓度呈正相关（P<0.01）。一般来说，在变暖条件下，森林土壤WEOC浓度降低，草甸土壤WEOC浓度增加。变暖对土壤WEOC和溶解无机氮（DIN）浓度的影响随时间而变化。我们阐明变暖对松林土壤WEOC浓度有显着影响，而土壤DIN浓度仅受草甸变暖的显着影响。我们的研究结果表明，土壤 WEOC 和 DIN 对山地森林和草甸生态系统的变暖表现出不同的反应。这项研究可以为预测复杂山地生态系统中土壤碳和氮循环及其对气候变化的响应提供有用的见解。
We investigated the differences among two types of forest (pine and oak forests) and a meadow in soil water extractable organic carbon (WEOC), ammonium (NH4+) and nitrate (NO3−) concentrations in the Qinling Mountains, China. Our results showed that soil WEOC, NH4+and NO3−concentrations were higher in the meadow than in the forests, and they were higher in the pine forest than in the oak forest. The soil surface temperature and soil water content were positively correlated with WEOC and inorganic nitrogen concentrations (P <0.01). In addition, there was a significantly negative correlation between soil WEOC concentration and pH (P <0.01). Moreover, soil WEOC concentration was positively correlated with the inorganic nitrogen concentration (P <0.01). Generally, soil WEOC concentration decreased in the forests, and increased in the meadow under warming condition. The effects of warming on soil WEOC and dissolved inorganic nitrogen (DIN) concentrations varied with time. We elucidated that warming had a significant influence on soil WEOC concentration in the pine forest, whereas soil DIN concentration was affected significantly by warming only in the meadow. Our findings indicate that soil WEOC and DIN show different responses to warming in the mountain forest and meadow ecosystems. This study could provide useful insights for the prediction of soil carbon and nitrogen cycling and their responses to climate change in the complex mountain ecosystem.