Assessment of spatiotemporal dynamics of diurnal fog occurrence in subtropical montane cloud forests

Li, Hsin-Ju; Lo, Min‐Hui; Juang, Jehn‐Yih; Wang, Jonathan; Huang, Chin Wei

doi:10.1016/j.agrformet.2022.108899

Cited by 4 publications

(5 citation statements)

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“…Finally, the relationships between ΔMML and 17 biophysical, bioclimatic, and topographic variables were quite similar, in terms of the change of positive/negative contributions, through years regardless of typhoon severity (Table 1). However, a significant first‐order (LV1) change in temperature range could be more related to the dynamics of fog occurrence (Jang et al, 2022; Li et al, 2022) than typhoon severity in Chilan Mountain. Our empirical data suggest that only typhoons with high severity enhance litter production in subtropical MCFs in the summer growing season; the results (Figure 3a) partially support Hypothesis 1.…”

Section: Discussionmentioning

confidence: 99%

Variation of seasonal litterfall in subtropical montane cloud forests to typhoon severity and environmental factors

Huang

Liu

et al. 2022

Biotropica

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Forest litterfall is pivotal for biogeochemical cycles and for assessing the impacts of perturbations on ecosystems. Typhoon occurrence is the primary mechanism for producing litterfall; Taiwan is situated in one of the most frequently disturbed regions. However, no typhoons were recorded in 2018, only occurring three times since 1911. This rare occasion, along with the regular (2017) and extreme typhoon (2016) years, provides an opportunity to investigate the responses of typhoon‐prone forest ecosystems to a future climate scenario: Elevated temperatures amplify the intensity but reduce the frequency of typhoons. We compared three years (2016–2018) of summer typhoon season (July–October) mean monthly litterfall (MML) in the subtropical montane cloud forests of northeastern Taiwan, and investigated the relationships between MML/typhoon‐induced MML (ΔMML) and 17 biophysical, bioclimatic and topographic attributes. More MML was produced in 2016, caused by strong winds and heavy rainfall. However, there was no statistical difference between 2017 and 2018 since forests may also produce substantial amounts of litterfall in summer without typhoons. The relationship between ΔMML and 17 variables was relatively insensitive to typhoon severity. Variables associated with succession and forest management were crucial for modeling MML in the presence of typhoons, but none of them were pivotal for MML without typhoons. The mean air temperature and elevation (related to forest productivity) were crucial for MML without typhoons; surface curvature may form shelters to prevent extreme typhoon with reduced MML. These outcomes may shed light on future ecosystem dynamics in typhoon‐prone forests under a changing climate. Abstract in Mandarin is available with online material.

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Section: Discussionmentioning

confidence: 99%

Variation of seasonal litterfall in subtropical montane cloud forests to typhoon severity and environmental factors

Huang

Liu

et al. 2022

Biotropica

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“…In Chilan MCFs, the winter northeastern monsoon brings frequent cloud/fog, which accounts for a significant portion of the total atmospheric water input (14%–32%), whereas during the summer season, the contribution of cloud/fog to total water input is relatively less (5%–13%) (Chang et al., 2006). Additionally, the average duration of fog in summer was recorded as 4.7 h day −1 , while it increased to 11.0 h day −1 during the rest of the year (Li et al., 2022). Therefore, the significant contribution of fog deposition in winter makes vegetation adaptive to a humid fog environment, potentially rendering them more susceptible to severe winter drought and enhancing leaf defoliation.…”

Section: Discussionmentioning

confidence: 99%

“…There is no apparent trend for annual precipitation but pronounced wet (2004–2008) and dry (2017–2020) periods were observed. Cloud and fog are commonly present in this region (Li et al., 2022). According to Chang et al.…”

Section: Methodsmentioning

confidence: 99%

“…There is no apparent trend for annual precipitation but pronounced wet (2004)(2005)(2006)(2007)(2008) and dry (2017-2020) periods were observed. Cloud and fog are commonly present in this region (Li et al, 2022). According to Chang et al (2006), the forests in this region intercepted 328 mm per year of fog wet deposition, accounting for approximately 10% of the total atmospheric hydrological deposition.…”

Section: Study Areamentioning

confidence: 99%

“…In Chilan MCFs, the winter northeastern monsoon brings frequent cloud/fog, which accounts for a significant portion of the total atmospheric water input (14%-32%), whereas during the summer season, the contribution of cloud/fog to total water input is relatively less (5%-13%) (Chang et al, 2006). Additionally, the average duration of fog in summer was recorded as 4.7 h day −1 , while it increased to 11.0 h day −1 during the rest of the year (Li et al, 2022).…”

Section: Vegetation Growth and Disturbance Severitymentioning

confidence: 99%

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Cross‐scale assessments of the impacts and resilience of subtropical montane cloud forests to chronic seasonal droughts and episodic typhoons

Wang,

Huang

2023

Global Change Biology

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Montane cloud forests (MCFs) are ecosystems frequently immersed in fog and are vital for the terrestrial hydrological cycle and biodiversity hotspots. However, the potential impacts of climate change, particularly intensified droughts and typhoons, on the persistence of ecosystems remain unclear. Our study conducted cross‐scale assessments using 6‐year (2016–2021) ground litterfall and 21‐year (2001–2021) satellite greenness data (the Enhanced Vegetation Index [EVI] and the EVI anomaly change [ΔEVI%]), gross primary productivity anomaly change (ΔGPP%), and meteorological variables (the standardized precipitation index [SPI] and wind speed). We found a positive correlation between summer EVI and ΔGPP% with the SPI‐3 (3‐month time scale), while winter litterfall showed a negative correlation. Maximum typhoon daily wind speed was negatively correlated with summer and the monthly ΔEVI% and ΔGPP%. These findings suggest vegetation damage and productivity loss were related to drought and typhoon intensities. Furthermore, our analysis highlighted that chronic seasonal droughts had more pronounced impacts on MCFs than severe typhoons, implying that high precipitation and frequent fog immersion do not necessarily mitigate the ramifications of water deficit on MCFs but might render MCFs more sensitive and vulnerable to drought. A significant negative correlation between the summer and winter ΔEVI% and ΔGPP% of the same year, suggesting disturbance severity during summer may facilitate vegetation regrowth and carbon accumulation in the subsequent winter. This finding may be attributed to the ecological resilience of MCFs, which enables them to recover from the previous summer. In the long‐term, our results indicated an increase in vegetation resilience over two decades in MCFs, likely driven by rising temperatures and elevated carbon dioxide levels. However, the enhancement of resilience might be overshadowed by the potential intensified droughts and typhoons in the future, potentially causing severe damage and insufficient recovery times for MCFs, thus raising concerns about uncertainties regarding their sustained resilience.

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Contribution of environmental factors to post-typhoon litterfall stability in subtropical montane cloud forests of the Asia-Pacific region

Huang,

Liu,

Chung

2024

Forest Ecology and Management

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Assessment of spatiotemporal dynamics of diurnal fog occurrence in subtropical montane cloud forests

Cited by 4 publications

References 61 publications

Variation of seasonal litterfall in subtropical montane cloud forests to typhoon severity and environmental factors

Variation of seasonal litterfall in subtropical montane cloud forests to typhoon severity and environmental factors

Cross‐scale assessments of the impacts and resilience of subtropical montane cloud forests to chronic seasonal droughts and episodic typhoons

Contribution of environmental factors to post-typhoon litterfall stability in subtropical montane cloud forests of the Asia-Pacific region

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