Interactive effects of ozone exposure and nitrogen addition on tree root traits and biomass allocation pattern: An experimental case study and a literature meta-analysis

Пин, Ли; Yin, Rongbin; Shang, Bo; Agathokleous, Evgenios; Zhou, Huimin; Feng, Zhaozhong

doi:10.1016/j.scitotenv.2019.136379

Cited by 29 publications

(18 citation statements)

References 76 publications

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“…The RMR of alfalfa in the present study showed a more N-dependent than P-dependent response, which declined in response to almost all N supply rates at both 0P and 20P, and tended to decline with increasing N rate at 20P. There are studies reporting that RMR declines with N addition (Li et al 2020;Zhang et al 2020). It is likely that, in the present study, in response to N addition, due to reduced C requirement for root biomass, the release of C by roots increased.…”

Section: Discussionsupporting

confidence: 45%

Increasing nitrogen supply to phosphorus-deficient Medicago sativa decreases shoot growth and enhances root exudation of tartrate to discharge surplus carbon dependent on nitrogen form

Zhang

Pan

et al. 2021

Plant Soil

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Carboxylate release by roots has been considered a strategy for mobilization and acquisition of phosphorus (P). However, recently, it was argued that carboxylate release may be a way to discharge surplus carbon produced under conditions that limit plant growth. Plant P status may not be the main factor driving carboxylate release by roots. Instead, plant nitrogen (N) status and/or N:P ratio of the soil or plant may play a more important role in enhancing carboxylate release. MethodsA greenhouse pot experiment was performed to grow alfalfa in a P-de cient soil, supplied with two rates of P (0 and 20 mg kg − 1 ) in combination with four forms of nitrogen (N) at ve rates (0, 25, 50, 75, and 100 mg kg − 1 ), to explore the effects of P rate, N form, N rate, and their interactions on plant growth, P and N status, and carboxylate release, and to determine the factors driving carboxylate release. ResultsNitrogen addition weakened the positive effect of P addition on plant growth, and increased plant N ([N]) and P concentrations ([P]); P addition increased plant [P], but weakened the effect of N addition on plant [N]. The amount of tartrate increased dramatically with increasing N rate, which decreased shoot growth, depending on N form. At high P supply, tartrate exudation correlated negatively with shoot biomass. ConclusionsNitrogen addition to P-de cient alfalfa decreased shoot growth and enhanced the release of tartrate, likely to discharge surplus carbon; and the effects varied with N form.

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Section: Discussionsupporting

confidence: 45%

Increasing nitrogen supply to phosphorus-deficient Medicago sativa decreases shoot growth and enhances root exudation of tartrate to discharge surplus carbon dependent on nitrogen form

Zhang

Pan

et al. 2021

Plant Soil

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“…We found that EO 3 significantly reduced woody biomass, but had no effect on root biomass and root‐to‐shoot ratio (Figure 4). Shang et al (2017) and Li et al (2020) who also studied poplar reported that EO 3 had a greater impact on root than on aboveground biomass, and that EO 3 did not impact root‐to‐shoot ratio, respectively. The differences in the observed biomass allocation responses to elevated O 3 likely result from differences in O 3 exposure characteristics among the experiments, interspecies variations, ontogenetic changes, and interacting environmental conditions.…”

Section: Discussionmentioning

confidence: 99%

Reduced photosynthetic thermal acclimation capacity under elevated ozone in poplar (Populus tremula) saplings

Dai

Harmens

et al. 2021

Global Change Biology

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The sensitivity of photosynthesis to temperature has been identified as a key uncertainty for projecting the magnitude of the terrestrial carbon cycle response to future climate change. Although thermal acclimation of photosynthesis under rising temperature has been reported in many tree species, whether tropospheric ozone (O3) affects the acclimation capacity remains unknown. In this study, temperature responses of photosynthesis (light‐saturated rate of photosynthesis (Asat), maximum rates of RuBP carboxylation (Vcmax), and electron transport (Jmax) and dark respiration (Rdark) of Populus tremula exposed to ambient O3 (AO3, maximum of 30 ppb) or elevated O3 (EO3, maximum of 110 ppb) and ambient or elevated temperature (ambient +5°C) were investigated in solardomes. We found that the optimum temperature of Asat (ToptA) significantly increased in response to warming. However, the thermal acclimation capacity was reduced by O3 exposure, as indicated by decreased ToptA, and temperature optima of Vcmax (ToptV) and Jmax (ToptJ) under EO3. Changes in both stomatal conductance (gs) and photosynthetic capacity (Vcmax and Jmax) contributed to the shift of ToptA by warming and EO3. Neither Rdark measured at 25°C (Rdark25) nor the temperature response of Rdark was affected by warming, EO3, or their combination. The responses of Asat, Vcmax, and Jmax to warming and EO3 were closely correlated with changes in leaf nitrogen (N) content and N use efficiency. Overall, warming stimulated growth (leaf biomass and tree height), whereas EO3 reduced growth (leaf and woody biomass). The findings indicate that thermal acclimation of Asat may be overestimated if the impact of O3 pollution is not taken into account.

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“…Мелкие корни одинаково чувствительны как к O 3 , так и к N, однако крупные корни чувствительны только к высоким концентрациям O 3 . Дисперсионный анализ показал высокую значимость N для мелких корней, а O 3для соотношения корень/побег, но совместное их воздействие не является статистически значимым для всех исследованных параметров [81].…”

Section: влияние техногенеза на корневые системы древесных растенийunclassified

“…Промышленные эксгалаты изменяют, прежде всего, физико-химические свойства почвы, вызывая увеличение ее кислотности [61] или, наоборот, подщелачивание [92], нередко в условиях техногенеза имеет место уменьшение содержания в почве минеральных веществ [94,101] и изменение микробиологического состава ризосферы [89][90]. Наиболее чувствительными как к естественным, так и к антропогенным факторам, являются поглощающие корни, тем не менее, загрязнение вызывает, как правило, существенное уменьшение корненасыщенности почвы всеми фракциями корней, как в условиях промышленных центров [13,31,37,58,60,77,98], так и в опытах с искусственным внесением токсикантов в среду [69, 79,81,[83][84]. Интересным является адаптивный механизм, когда при общем угнетении корневых систем или угнетении только отдельных корневых фракций наблюдается перераспределение во фракционном составе в пользу увеличения долей тех или иных корневых фракций [2,5,12,31,45,59], а также эффект «избегания» корневыми системами наиболее загрязненных слоев почвенного профиля [13,19,58].…”

Section: заключениеunclassified

Техногенез И Структурно-Функциональные Реакции Древесных Видов: Повреждения, Адаптации, Стратегии. Часть 3. Влияние На Радиальный Прирост И Корневые Системы.

Уразгильдин¹,

Кулагин²

2021

Biosfera

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The present publication is the third of four reviews of reports that have been published over the last 20 years to address the responses of arboreal plants at different hierarchical levels of their organization to anthropogenic factors. Here, the impact of different types of industrial pollution on the radial accretion of the stock and on the rootage is considered. Most studies evidence that industrial pollution leads to unequivocal decreases in the radial accretion and in the sensitivity of the accretion to climatic cues, to the redistribution of the early and late wood in the total accretion, to changes in the durations of the ontogenetic periods and disorders in ontogenetic cycles, to the emergence or loss of the false annual zones, to accelerated senescence of forests, and to increases in the dependencies of accretion on the distance between forests and the sources of pollution and on the features of landscape. The decreases in the annual zone widths strongly depend on the contents of metals and microelements in the zones. Upon a decrease in pollutant discharges, the annual accretion may become restored. With that, some types of oil products, radionuclides and mixed pollutants can stimulate accretion depending on plant species, age, and conditions. As a rule, industrial or experimental pollution causes significant decreases in soil contents of all rootage components. The adaptive responses of rootage to pollution include redistribution of its different components in favor of some of them upon the background of the general rootage decline. Roots may “avoid” the most polluted soil layers and may actively excrete exudates able to prevent the penetration of a pollutant into rootage. Pollution with oil products may stimulate soil saturation with the rootage of most coniferous and only some deciduous plants. The radioactive pollution is more hazardous for rootage growth than for the radial accretion.

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Interactive effects of ozone exposure and nitrogen addition on tree root traits and biomass allocation pattern: An experimental case study and a literature meta-analysis

Cited by 29 publications

References 76 publications

Increasing nitrogen supply to phosphorus-deficient Medicago sativa decreases shoot growth and enhances root exudation of tartrate to discharge surplus carbon dependent on nitrogen form

Increasing nitrogen supply to phosphorus-deficient Medicago sativa decreases shoot growth and enhances root exudation of tartrate to discharge surplus carbon dependent on nitrogen form

Reduced photosynthetic thermal acclimation capacity under elevated ozone in poplar (Populus tremula) saplings

Техногенез И Структурно-Функциональные Реакции Древесных Видов: Повреждения, Адаптации, Стратегии. Часть 3. Влияние На Радиальный Прирост И Корневые Системы.

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