Ozone dose-response relationships for soil microbial dynamics of winter wheat in North China
Ozone dose-response relationships for soil microbial dynamics of winter wheat in North China
复制标题
华北冬小麦土壤微生物动态的臭氧剂量-反应关系
DOI：
10.1016/j.atmosenv.2019.05.023
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发表时间：
2019-09
影响因子：
5
通讯作者：
Zhang Weiwei
中科院分区：
文献类型：
--
作者：
Hu Enzhu;Dong Ruinan;Nan Xiangli;Yuan Zaijian;Zhang Hongxing;Wang Xiaoke;Zhang Weiwei
冬小麦（Triticum aestivumL.）土壤微生物特性对臭氧浓度升高的动态响应从未被量化。在这项研究中，冬小麦在两种对比臭氧处理下种植：未过滤的环境空气（以下简称NF）和升高的臭氧（9小时平均臭氧浓度有效增加高于环境空气34.91±1.42nL·L−1（平均值±SE），以下简称EO3）。在每个变量的响应比（即 EO3/NF）与基于暴露或通量的臭氧指数（即 EO3-NF）的增量之间进行线性回归。结果表明，土壤微生物量C、N的响应比以及累积CO2和N2O排放量与臭氧指数的增量显着相关。 ΔPOD0（无阈值的综合植物毒性臭氧剂量增量）和ΔAOT40（累积每小时O3浓度超过阈值40nL·L−1的增量）表现优于ΔSUM06、ΔW126和其他基于通量的臭氧指数的增量。它们与土壤微生物量的线性关系比与气体流出的线性关系更强。与无效应线的偏差扩大表明臭氧对土壤微生物特性有明显的累积有害影响。氨氮含量和亚硝酸还原酶活性对累积臭氧胁迫表现出非显着的适应性和自我调节反应。这里获得的臭氧剂量-响应关系将有利于生态模型评估全球气候变化下可持续农业生态系统的动态响应或预测反馈效应。
Dynamic responses of soil microbial properties of winter wheat (Triticum aestivumL.) to elevated ozone concentration have never been quantified. In this study, the winter wheat was cultivated under two contrasting ozone treatments: non-filtered ambient air (hereinafter called NF) and elevated ozone (effective increase in 9-h mean ozone concentration of 34.91 ± 1.42 nL·L−1(mean ± SE) above ambient, hereinafter called EO3). Linear regressions between the response ratio of each variable (i.e. EO3/NF) and the increments of exposure- or flux-based ozone indices (i.e. EO3- NF) were conducted. The results showed that the response ratios of soil microbial biomass C and N, as well as cumulative CO2and N2O effluxes significantly correlated with the increments of ozone indices. The ΔPOD0(increment of integrated phytotoxic ozone dose with no threshold) and the ΔAOT40 (increment of accumulated hourly O3concentrations over a threshold of 40 nL·L−1) performed better than ΔSUM06, ΔW126 and the increments of other flux-based ozone indices. They showed stronger linear relationships with soil microbial biomass than that with gas effluxes. The expanded deviations from the effect-free line indicated distinct cumulative detrimental ozone impacts on soil microbial properties. Ammonia nitrogen content and nitrite reductase activity showed non-significantly adaptive and self-adjustment responses to accumulative ozone stress. The ozone dose-response relationships obtained here will benefit the ecological modeling that evaluates the dynamic responses or predicts the feedback effects of sustainable agro-ecosystems under global climate change.
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影响因子：
5
作者：
K. Vijayaraghavan;Sunny Cho;R. Morris;David R. Spink;Jaegun Jung;R. Pauls;Katherine Duffett
通讯作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
8.9
作者：
Hu, Enzhu;Gao, Feng;Feng, Zhaozhong
通讯作者：
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影响因子：
11.6
作者：
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通讯作者：
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