Spatio-Temporal Diversity in the Link between Tree Radial Growth and Remote Sensing Vegetation Index of Qinghai Spruce on the Northeastern Margin of the Tibetan Plateau

Wei, Mengyuan; Jiao, Liang; Zhang, Peng; Wu, Xuan; Xue, Ruhong; Du, Dashi

doi:10.3390/f14020260

Cited by 3 publications

(3 citation statements)

References 69 publications

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“…However, our findings of two spectral vegetation indices, EVI and VARI, may offer key indices to detect trees that are under water-stressed conditions, causing changes in the physiological and biochemical processes in trees. For example, Wei et al (2023) found a positive correlation between spatial and temporal variations of tree-ring width (TRW) and the Enhanced Vegetation Index (EVI). The relationship between the TRW and EVI became stronger in more arid regions where trees were under more drought and subsequent water-stress conditions (Wei et al, 2023).…”

Section: Limitations Of the Studymentioning

confidence: 99%

“…For example, Wei et al (2023) found a positive correlation between spatial and temporal variations of tree-ring width (TRW) and the Enhanced Vegetation Index (EVI). The relationship between the TRW and EVI became stronger in more arid regions where trees were under more drought and subsequent water-stress conditions (Wei et al, 2023).…”

Section: Limitations Of the Studymentioning

confidence: 99%

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Detection of susceptible Norway spruce to bark beetle attack using PlanetScope multispectral imagery

Trubin

Kozhoridze

Zabihi

et al. 2023

Front. For. Glob. Change

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Climate change-related acute or long-term drought stress can weaken forest ecosystems and result in widespread bark beetle infestations. Eurasian spruce bark beetle (Ips typographus L.) infestations have been occurring in Norway spruce [Picea abies (L.) Karst.]-dominated forests in central Europe including the Czechia. These infestations appear regularly, especially in homogeneous spruce stands, and the impact varies with the climate-induced water stress conditions. The removal of infected trees before the beetles leave the bark is an important step in forest pest management. Early identification of susceptible trees to infestations is also very important but quite challenging since stressed tree-tops show no sign of discolouration in the visible spectrum. We investigated if individual spectral bandwidths or developed spectral vegetation indices (SVIs), can be used to differentiate non-attacked trees, assumed to be healthy, from trees susceptible to attacks in the later stages of a growing season. And, how the temporal-scale patterns of individual bands and developed SVIs of susceptible trees to attacks, driven by changes in spectral characteristics of trees, behave differently than those patterns observed for healthy trees. The multispectral imagery from the PlanetScope satellite coupled with field data were used to statistically test the competency of the individual band and/or developed SVIs to differentiate two designated classes of healthy and susceptible trees. We found significant differences between SVIs of the susceptible and healthy spruce forests using the Enhanced Vegetation Index (EVI) and Visible Atmospherically Resistant Index (VARI). The accuracy for both indices ranged from 0.7 to 0.78; the highest among all examined indices. The results indicated that the spectral differences between the healthy and susceptible trees were present at the beginning of the growing season before the attacks. The existing spectral differences, likely caused by water-stress stimuli such as droughts, may be a key to detecting forests susceptible to early infestations. Our introduced methodology can also be applied in future research, using new generations of the PlanetScope imagery, to assess forests susceptibility to bark beetle infestations early in the growing season.

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Section: Limitations Of the Studymentioning

confidence: 99%

Section: Limitations Of the Studymentioning

confidence: 99%

Detection of susceptible Norway spruce to bark beetle attack using PlanetScope multispectral imagery

Trubin

Kozhoridze

Zabihi

et al. 2023

Front. For. Glob. Change

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show abstract

“…They also play an indispensable role in maintaining the ecological safety of the Asian water tower and the upper of the Yangtze River [35]. Spruce forests, with their narrower ecological amplitude and sensitivity to climate change [36,37], are among the most threatened in the context of global warming, especially in the highly climatesensitive region of the Tibetan Plateau [38][39][40]. Therefore, it is of great research importance to recognize the variations in the suitable distribution pattern of endangered spruce on the Tibetan Plateau.…”

Section: Introductionmentioning

confidence: 99%

Global Warming Drives Expansion of Endangered Spruce Forest on the Tibetan Plateau

Zhang,

Yuan,

Zou

et al. 2024

Sustainability

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Global warming is critical to the distribution pattern of endangered plants; therefore, understanding the future changes in the adaptive areas of endangered spruce and driving factors on the Tibetan Plateau is of great research significance for spruce species conservation and sustainability. In this study, variations in the distribution pattern of four endangered spruce species (Picea. Balfouriana, Picea. Linzhiensis, Picea. Complanata, and Picea. Aurantiaca) on the Tibetan Plateau were predicted by the MaxEnt model, and the important environmental variables affecting its geographic distribution were analyzed. We found that under the current climate conditions, the four endangered spruce species were mainly situated in the southern and southeastern Tibetan Plateau. The mean temperature of the coldest quarter was a key environmental variable affecting the geographic distribution of four endangered spruce species, with suitable growth ranges of −9–8 °C for P. balfouriana and −6–5 °C for P. linzhiensis, P. complanata, and P. aurantiaca. Under different future climate pathways, the highly suitable habitat of four endangered spruce was mainly situated in the east, south, and southeast districts of the Tibetan Plateau. With the suitable growth range of key variables continuing to expand on the Tibetan Plateau, the area of suitable habitat for each of the four endangered spruce species increases to varying degrees. Compared with the current climate, four endangered spruce species will expand to the northwest of the Tibetan Plateau under different future climate scenarios, and the degree of expansion will increase with the increase in temperature. This study not only reveals the response of suitable habitats of four endangered spruce species to global warming, but also provides scientific insights for spruce population conservation and sustainable development.

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Ecological classification can help with assisted plant migration in forestry, nature conservation, and landscape planning

Kusbach,

Dujka,

Šebesta

et al. 2023

Forest Ecology and Management

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Spatio-Temporal Diversity in the Link between Tree Radial Growth and Remote Sensing Vegetation Index of Qinghai Spruce on the Northeastern Margin of the Tibetan Plateau

Cited by 3 publications

References 69 publications

Detection of susceptible Norway spruce to bark beetle attack using PlanetScope multispectral imagery

Detection of susceptible Norway spruce to bark beetle attack using PlanetScope multispectral imagery

Global Warming Drives Expansion of Endangered Spruce Forest on the Tibetan Plateau

Ecological classification can help with assisted plant migration in forestry, nature conservation, and landscape planning

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