Effect of elevated tropospheric ozone on soil carbon and nitrogen: a meta-analysis
Effect of elevated tropospheric ozone on soil carbon and nitrogen: a meta-analysis
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DOI：
10.1088/1748-9326/ac49b9
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发表时间：
2022-01
影响因子：
6.7
通讯作者：
Enzhu Hu;Zhimin Ren;Xiaoke Wang;Hongxing Zhang;Weiwei Zhang
中科院分区：
文献类型：
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作者：
Enzhu Hu;Zhimin Ren;Xiaoke Wang;Hongxing Zhang;Weiwei Zhang
对流层臭氧浓度（[O3]）的升高可能对陆地生态系统的地下过程产生重大影响。然而，全面和定量的了解土壤C和N动态的响应升高[O3]仍然难以捉摸。在这项研究中，41个同行评议的研究结果综合使用元分析技术，以量化的影响O3对10个变量与土壤C和N，即总C（TC，包括土壤有机碳）、全氮（TN）、溶解性有机碳（DOC）、氨态氮（NH 4+）、硝酸盐氮（NO3 −）、微生物量碳（MBC）和氮（MBN），硝化速率（NTF）和反硝化速率（DNF）以及C/N比。结果表明，随着[O3]增加（27.6 ± 18.7 nl l−1），各指标均发生显著变化（P < 0.05），其中TC、DOC、TN、NH 4+、MBC、MBN和NTF降低，C/N、NO3 −和DNF升高。TN、NTF和DNF的效应量与O3熏气浓度和熏气时间呈显著正相关（P < 0.05）。土壤pH和气候是分析O3对土壤C和N影响的关键。然而，大多数变量升高[O3]的响应一般是独立的O3熏蒸方法，陆地生态系统类型，和额外的[CO2]曝光。[O3]浓度升高改变了土壤C、N动态，降低了土壤C库容量，改变了土壤N的有效性，从而影响植物生长，增加土壤N的流失。
Elevated tropospheric ozone concentration ([O3]) may substantially influence the belowground processes of the terrestrial ecosystem. Nevertheless, a comprehensive and quantitative understanding of the responses of soil C and N dynamics to elevated [O3] remains elusive. In this study, the results of 41 peer-reviewed studies were synthesized using meta-analytic techniques, to quantify the impact of O3 on ten variables associated with soil C and N, i.e. total C (TC, including soil organic C), total N (TN), dissolved organic C (DOC), ammonia N (NH4 +), nitrate N (NO3 −), microbial biomass C (MBC) and N (MBN), rates of nitrification (NTF) and denitrification (DNF), as well as C/N ratio. The results depicted that all these variables showed significant changes (P < 0.05) with [O3] increased by 27.6 ± 18.7 nl l−1 (mean ± SD), including decreases in TC, DOC, TN, NH4 +, MBC, MBN and NTF, and increases in C/N, NO3 − and DNF. The effect sizes of TN, NTF, and DNF were significantly correlated with O3 fumigation levels and experimental duration (P < 0.05). Soil pH and climate were essential in analyses of O3 impacts on soil C and N. However, the responses of most variables to elevated [O3] were generally independent of the O3 fumigation method, terrestrial ecosystem type, and additional [CO2] exposure. The altered soil C and N dynamics under elevated [O3] may reduce its C sink capacity, and change soil N availability and thus, impact plant growth and enhance soil N losses.