Monthly Radial Growth Model of Chinese Fir (Cunninghamia lanceolata (Lamb.) Hook.), and the Relationships between Radial Increment and Climate Factors

Huang, Yaqi; Deng, Xiaomin; Zhao, Zhichao; Xiang, Wenhua; Yan, Wende; Ouyang, Shuai

doi:10.3390/f10090757

Cited by 17 publications

(4 citation statements)

References 48 publications

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“…The ED-2.2 model qualitatively captured the seasonality of NPP in subtropical coniferous forests (Figure 1), indicating that the model can be used to simulate the monthly productivity dynamics of subtropical coniferous forests in southern China. The results of the model for monthly productivity changes in C. lanceolata and P. massoniana forests are highly similar to those of another study on the monthly growth of C. lanceolata forests in subtropical China [83].…”

Section: Model Performance In the Subtropical Coniferous Forestssupporting

confidence: 80%

Simulating the Impacts of Drought and Warming in Summer and Autumn on the Productivity of Subtropical Coniferous Forests

Xie

Zhu

Deng³

et al. 2022

Forests

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The impacts of drought and/or warming on forests have received great attention in recent decades. Although the extreme drought and/or warming events significantly changed the forest demography and regional carbon cycle, the seasonality quantifying the impacts of these climate extremes with different severities on the productivity of subtropical coniferous forests remains poorly understood. This study evaluated the effects of seasonal drought and/or warming on the net primary productivity (NPP) of subtropical coniferous forests (i.e., Cunninghamia lanceolata and Pinus massoniana forests) from Hengyang–Shaoyang Basin in southern China using the Ecosystem Demography model, Version 2.2 (ED-2.2) and based on the datasets from forest inventory, meteorological reanalysis, and remotely sensed products. The results showed that the goodness of fit of the DBH-height allometric equations was better than that of the default in ED-2.2 after model calibration; the ED-2.2 model qualitatively captured the seasonality of NPP in the subtropical coniferous forests; and the mismatch between simulated annual NPP and MODIS-NPP (MOD17A3HGF) became smaller over time. The effect of seasonal drought on NPP was greater than that of warming; the decline rate of NPP gradually increased and decreased with time (from July to October) under the seasonal drought and warming scenarios, respectively; NPP decreased more seriously under the combined drought-warming scenario in October, with an average decrease of 31.72%, than the drought-only and warming-only scenarios; seasonal drought had an obvious legacy impact on productivity recovery of subtropical coniferous forests, but it was not the case for warming. With the increase in drought severity, the average values of soil available water and NPP together showed a downward trend. With the increase in warming severity, the average values of canopy air space temperature increased, but NPP decreased. Seasonal drought and/or warming limit forest production through decreasing soil moisture and/or increasing canopy air space temperature, which impact on plant photosynthesis and productivity, respectively. Our results highlight the significance of taking into account the impacts of seasonal warming and drought when evaluating the productivity of subtropical coniferous forests, as well as the significance of enhancing the resistance and resilience of forests to future, more severe global climate change.

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Section: Model Performance In the Subtropical Coniferous Forestssupporting

confidence: 80%

Simulating the Impacts of Drought and Warming in Summer and Autumn on the Productivity of Subtropical Coniferous Forests

Xie

Zhu

Deng³

et al. 2022

Forests

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“…The study site is located at Chenshan Forestry Station, Jiangxi Province, China (27°04′-27°36′ N, 114°0′-114°47′ E), at an altitude of 140 ~ 450 m. It has a humid subtropical climate with an annual mean temperature of 17.7°C (5.9 and 28.9°C in January and July, respectively). Annual precipitation is mainly concentrated in the summer windy season from June to August, with an annual average of 1649 h of sunshine and an annual average frost-free period of 279 d. (Huang et al 2019). Soil surface pH (0-10cm) was 4.27.…”

Section: Study Site and Weathermentioning

confidence: 99%

Variations of water use efficiency, C, N concentration in Chinese fir under climate change based on carbon stable isotope analysis

You

Liu

Deng

et al. 2022

Preprint

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Water use efficiency (WUEi) can strongly influence the growth of individual tree diameter, and drought caused by increasing temperatures can profoundly affect the water use strategy of red-heart Chinese fir. The differences in WUE of red-heart Chinese fir juveniles under different ages and meteorological conditions have not been studied yet. Here, the standardized precipitation evapotranspiration index (SPEI) was calculated to determine the extent of drought and studied the relationship between WUEi and other ecological factors through path analysis. Compared with 1981–2020, the mean monthly temperature and annual total precipitation in 2015–2020 increased by 0.7 ° C and 177mm, respectively. Significant differences in WUEi at different leaf and branch ages. WUEi and N concentration decreased with the age increase, but C concentration increased. Carbon isotope increased with the increase of relative tree height. N concentration and C/N did not change significantly with the increase in relative tree height. There were significant differences in WUEi under different SPEI. In 2020 (SPEI = 0.12), the WUEi of branches and leaves was the highest, which were 92.7% and 88.4%, respectively. WUEi and C concentration have a significant negative relationship (-0.516). Tree basic area increment (BAI) was significantly negatively correlated with precipitation (-0.777) and relative humidity (-0.488) and significantly positively correlated with temperature (0.871). Our results show that red-heart Chinese fir has a high demand for water and nutrients in the juvenile stage, which could further provide a theoretical basis for the directed cultivation and sustainable management of red-heart Chinese fir.

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“…Drought negatively affects its physiological and biochemical processes, resulting in retarded growth and the lowering of its yield and quality [ 24 ]. As global warming intensifies, variable precipitation and seasonal droughts pose a serious threat to the growth and survival of water-demand-sensitive trees in subtropical China [ 25 ], such as T. ciliata . Therefore, methods for mitigating drought damage in T. ciliata should be explored for the development of management strategies aimed at maintaining the long-term productivity of T. ciliata in arid environments.…”

Section: Introductionmentioning

confidence: 99%

Salicylic Acid Modulates the Osmotic System and Photosynthesis Rate to Enhance the Drought Tolerance of Toona ciliata

Gao,

Liu,

Liu

et al. 2023

Plants

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Toona ciliata M. Roem. is a valuable and fast-growing timber species which is found in subtropical regions; however, drought severely affects its growth and physiology. Although the exogenous application of salicylic acid (SA) has been proven to enhance plant drought tolerance by regulating the osmotic system and photosynthesis rate, the physiological processes involved in the regulation of drought tolerance by SA in various plants differ. Therefore, drought mitigation techniques tailored for T. ciliata should be explored or developed for the sustainable development of the timber industry. We selected 2-year-old T. ciliata seedlings for a potting experiment, set the soil moisture at 45%, and subjected some of the T. ciliata seedlings to a moderate drought (MD) treatment; to others, 0.5 mmol/L exogenous SA (MD + SA) was applied as a mitigation test, and we also conducted a control using a normal water supply at 70% soil moisture (CK). Our aim was to investigate the mitigating effects of exogenous SA on the growth condition, osmotic system, and photosynthesis rate of T. ciliata under drought stress conditions. OPLS–VIP was used to analyze the main physiological factors that enable exogenous SA to alleviate drought-induced injury in T. ciliata. The results indicated that exogenous SA application increased the growth of the ground diameter, plant height, and leaf blades and enhanced the drought tolerance of the T. ciliata seedlings by maintaining the balance of their osmotic systems, improving their gas exchange parameters, and restoring the activity of their PSII reaction centers. The seven major physiological factors that enabled exogenous SA to mitigate drought-induced injury in the T. ciliata seedlings were the soluble proteins (Sp), net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs), stomatal opening window (Sow), activity of the photosystem II reaction center (ΦPSII), and electron transfer rate (ETR). Of these, Sp was the most dominant factor. There was a synergistic effect between the osmotic system and the photosynthetic regulation of drought injury in the T. ciliata seedlings. Overall, our study confirms that exogenous SA enhances the drought tolerance of T. ciliata by modulating the osmotic system and photosynthesis rate.

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Monthly Radial Growth Model of Chinese Fir (Cunninghamia lanceolata (Lamb.) Hook.), and the Relationships between Radial Increment and Climate Factors

Cited by 17 publications

References 48 publications

Simulating the Impacts of Drought and Warming in Summer and Autumn on the Productivity of Subtropical Coniferous Forests

Simulating the Impacts of Drought and Warming in Summer and Autumn on the Productivity of Subtropical Coniferous Forests

Variations of water use efficiency, C, N concentration in Chinese fir under climate change based on carbon stable isotope analysis

Salicylic Acid Modulates the Osmotic System and Photosynthesis Rate to Enhance the Drought Tolerance of Toona ciliata

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