Growth and carbon sequestration of poplar plantations on the Tibetan Plateau

Yuan, Y.; Shu, Shumiao; Wang, Wenzhi; Liu, Ruixuan; Wang, Yuelin; Wang, Xiaodan; Zhang, Sheng

doi:10.1016/j.ecolind.2023.109930

Cited by 8 publications

(18 citation statements)

References 63 publications

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“…Poplars (Populus spp. ), known for their rapid growth and ease of cultivation, play a pivotal role in ecological stability and forest restoration (Debeljak et al, 2014;Liao et al, 2020;Yao et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

“…Although some poplars are planted on relatively wet riverbanks, most grow in arid and semi-arid environments where they are exposed to prolonged drought (Lei et al, 2006;Yao et al, 2023). Drought affects the ecological benefits of poplar forests by limiting their growth, survival or physiological performance.…”

Section: Introductionmentioning

confidence: 99%

“…), known for their rapid growth and ease of cultivation, play a pivotal role in ecological stability and forest restoration (Debeljak et al, 2014; Liao et al, 2020; Yao et al, 2023). Although some poplars are planted on relatively wet riverbanks, most grow in arid and semi‐arid environments where they are exposed to prolonged drought (Lei et al, 2006; Yao et al, 2023). Drought affects the ecological benefits of poplar forests by limiting their growth, survival or physiological performance.…”

Section: Introductionmentioning

confidence: 99%

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Drought responses and carbon allocation strategies of poplar with different leaf maturity

Yao,

Xia,

Yang

et al. 2024

Physiologia Plantarum

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Leaf characteristics can reflect the adaptation of trees to drought stress. However, the effect of leaf maturity on drought stress has been neglected, leading to uncertainty in inferring individual tree responses to drought from leaves. The allocation strategy of photosynthetic carbon between leaf organs (fully expanded young and old leaves) under drought stress remains unclear. Poplar is a diverse and widespread tree species in arid and semi‐arid regions. Here, three poplar genotypes (Populus cathayana, P. × euramericana ‘Nanlin 895’, and P. alba × P. tremula var. glandulosa) were selected and exposed to different watering regimes. The responses and carbon allocation strategies of leaves with different maturity to drought were investigated using a combination of leaf traits and 13C pulse labelling technique. The results showed that (1) fully expanded young leaves had better osmotic regulation and antioxidant capacity than aged leaves under drought stress. (2) Aged leaves acted as a carbon source during water deficit, where their photosynthetic products were transferred and supplied to upper young leaves to promote stronger photosynthesis in young leaves to acquire resources for tree growth. This study highlights that the effect of leaf maturity should be considered in the future when investigating the effects of drought on woody plants, especially for continuously growing tree species. Therefore, our study not only demonstrates the existence of leaf‐age‐dependent responses to drought in poplar but also provides new insights into carbon allocation at the leaf level.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Drought responses and carbon allocation strategies of poplar with different leaf maturity

Yao,

Xia,

Yang

et al. 2024

Physiologia Plantarum

Self Cite

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“…Poplar (Populus spp.) is an important fast-growing and high-yield tree species in the world, with a wide range of planted areas, which make significant contributions to the world's ecosystem services, such as soil and water conservation and carbon sequestra-tion [20]. However, drought has resulted in extremely severe yield reductions and losses in large areas of poplar trees [21].…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Quantification and Visualization of Leaf Chlorophyll Content in Poplar Saplings under Drought Using SFM-MVS

Tian,

Zhang,

Bian

et al. 2023

Forests

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As global temperatures warm, drought reduces plant yields and is one of the most serious abiotic stresses causing plant losses. The early identification of plant drought is of great significance for making improvement decisions in advance. Chlorophyll is closely related to plant photosynthesis and nutritional status. By tracking the changes in chlorophyll between plant strains, we can identify the impact of drought on a plant’s physiological status, efficiently adjust the plant’s ecosystem adaptability, and achieve optimization of planting management strategies and resource utilization efficiency. Plant three-dimensional reconstruction and three-dimensional character description are current research hot spots in the development of phenomics, which can three-dimensionally reveal the impact of drought on plant structure and physiological phenotypes. This article obtains visible light multi-view images of four poplar varieties before and after drought. Machine learning algorithms were used to establish the regression models between color vegetation indices and chlorophyll content. The model, based on the partial least squares regression (PLSR), reached the best performance, with an R2 of 0.711. The SFM-MVS algorithm was used to reconstruct the plant’s three-dimensional point cloud and perform color correction, point cloud noise reduction, and morphological calibration. The trained PLSR chlorophyll prediction model was combined with the point cloud color information, and the point cloud color was re-rendered to achieve three-dimensional digitization of plant chlorophyll content. Experimental research found that under natural growth conditions, the chlorophyll content of poplar trees showed a gradient distribution state with gradually increasing values from top to bottom; after being given a short period of mild drought stress, the chlorophyll content accumulated. Compared with the value before stress, it has improved, but no longer presents a gradient distribution state. At the same time, after severe drought stress, the chlorophyll value decreased as a whole, and the lower leaves began to turn yellow, wilt and fall off; when the stress intensity was consistent with the duration, the effect of drought on the chlorophyll value was 895 < SY-1 < 110 < 3804. This research provides an effective tool for in-depth understanding of the mechanisms and physiological responses of plants to environmental stress. It is of great significance for improving agricultural and forestry production and protecting the ecological environment. It also provides decision-making for solving plant drought problems caused by global climate change.

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“…On the one hand, climate, competition, disturbance, and functional traits regulate the unimodal growth trajectory and fluctuate or change over time (Hérault et al 2011). On the other hand, trees with different sizes may respond differently to these influence factors, and shape different growth trajectories (Yao et al 2023). Metabolic growth theory (Hou et al 2008;Zuo et al 2012) provides a promising basis for understanding tree growth.…”

Section: Introductionmentioning

confidence: 99%

Effect of Tree Size Heterogeneity on the Overall Growth Trend of Trees in Coniferous Forests of the Tibetan Plateau

Wang¹,

Shu²,

Wang³

et al. 2023

Preprint

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Tree growth is under the combined influence of abiotic and biotic factors. Trees with different sizes may respond differently to these factors, implying that tree heterogeneity in tree size may also modulate the overall growth trend. To test this hypothesis, we focused on the radial growth trends of natural subalpine forests on the Tibetan Plateau. We first extended the iterative growth model (IGM) to the tree-ring scale (IGMR) to test the applicability of the generalized metabolic growth theory to tree growth. As predicted by the IGMR, the radial growth of trees at the aggregate scale is constrained by a unimodal pattern. Using the IGMR, we reconstructed the historical best growth trajectory (HBGT) of trees within the same community based on the tree with the largest radius and/or longest age in the community. From the average difference between the HBGT and the current radial growth rate of trees with different sizes, we constructed an indicator that can measure the overall variation in tree radial growth. Based on this indicator, we found a negative effect of tree size heterogeneity on the overall variability of tree growth across elevations. Further analysis also revealed that the radial growth rate of trees on the Tibetan Plateau has increased significantly compared to the past, where growing season average temperature and annual minimum temperature were negatively and positively correlated with tree growth below and above the treeline, respectively. Our study not only confirmed that the overall variability of tree growth depends on tree size heterogeneity but also proposed an indicator that reveals net changes in tree radial growth rate relative to the past. These theoretical advances facilitate the understanding of changes in the extent of subalpine forests.

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Growth and carbon sequestration of poplar plantations on the Tibetan Plateau

Cited by 8 publications

References 63 publications

Drought responses and carbon allocation strategies of poplar with different leaf maturity

Drought responses and carbon allocation strategies of poplar with different leaf maturity

Three-Dimensional Quantification and Visualization of Leaf Chlorophyll Content in Poplar Saplings under Drought Using SFM-MVS

Effect of Tree Size Heterogeneity on the Overall Growth Trend of Trees in Coniferous Forests of the Tibetan Plateau

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