Physiological response and photosynthetic recovery to an extreme drought: Evidence from plants in a dry-hot valley savanna of Southwest China

Yang, Da; Wang, Yang-Si-Ding; Wang, Qin; Ke, Yan; Zhang, Yun‐Bing; Zhang, Shi‐Bao; Zhang, Yongjiang; McDowell, Nate G.; Zhang, Jiao‐Lin

doi:10.1016/j.scitotenv.2023.161711

Cited by 10 publications

(2 citation statements)

References 67 publications

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“…Initial studies predominantly focused on the zonality of vegetation landscape appearance ( Qu, 1957 ; Jiang, 1980 ), taxonomic compositions ( Wu, 1965 , Wu, 1979 ), and community classifications ( Jin et al., 1987 ; Ou, 1988 ). Driven by the requirements of regional vegetation restoration and soil degradation mitigation, subsequent efforts also delved into the functional traits underpinning the adaptive evolution of arid valley vegetation ( Zhang et al., 2012 ; Yan et al., 2016 ) and the physiochemical intricacies ( Yang et al., 2023 ). During this period, vertical differentiation of vegetation arising from complex interactions between topography and regional climate emerged as a focal ecological concern.…”

Section: Introductionmentioning

confidence: 99%

Climate and soil stressed elevation patterns of plant species to determine the aboveground biomass distributions in a valley-type Savanna

He,

Shi,

Fang

et al. 2024

Front. Plant Sci.

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IntroductionExtreme environments such as prolonged high temperatures and droughts can cause vulnerability of vegetation ecosystems. The dry-hot valleys of Southwestern China, known for their extremely high annual temperature, lack of water, and unique non-zonal “hot island” habitat in the global temperate zone, provide exceptional sites for studying how plant adapts to the prolonged dry and hot environment. However, the specific local biotic-environment relationships in these regions remain incompletely elucidated. The study aims to evaluate how valley-type Savanna vegetation species and their communities adapt to long-term drought and high-temperature stress environments.MethodsThe study investigated the changes in species diversity and communities’ aboveground biomass of a valley-type Savanna vegetation along an elevation gradient of Yuanmou dry-hot valley in Jinsha River basin, southwest China. Subsequently, a general linear model was utilized to simulate the distribution pattern of species diversities and their constituent biomass along the elevation gradient. Finally, the RDA and VPH mothed were used to evaluate the impacts and contributions of environmental factors or variables on the patterns.Results and discussionThe field survey reveals an altitudinal gradient effect on the valley-type Savanna, with a dominant species of shrubs and herbs plants distribution below an elevation of 1700m, and a significant positive relationship between the SR, Shannon-Wiener, Simpson, and Pielou indices and altitudes. Relatively, the community aboveground biomass did not increase significantly with elevation, which was mainly due to a decreased biomass of herbaceous plants along the elevation. Different regulators of shrub-herbaceous plant species and their functional groups made different elevation patterns of species diversity and aboveground biomass in valley-type Savannas. Herbaceous plants are responsible for maintaining species diversity and ensuring stability in the aboveground biomass of the vegetation. However, the influence of shrubs on aboveground biomass became more pronounced as environmental conditions varied along the altitudinal gradient. Furthermore, species diversity was mainly influenced by soil and climatic environmental factors, whereas community biomass was mainly regulated by plant species or functional groups. The study demonstrates that the spatial pattern of valley-type Savanna was formed as a result of different environmental responses and the productive capacity of retained plant species or functional groups to climate-soil factors, highlighting the value of the Yuanmou dry-hot Valley as a microcosm for exploring the intricate interactions between vegetation evolution and changes in environmental factors.

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Section: Introductionmentioning

confidence: 99%

Climate and soil stressed elevation patterns of plant species to determine the aboveground biomass distributions in a valley-type Savanna

He,

Shi,

Fang

et al. 2024

Front. Plant Sci.

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“…The sensitive and fragile ecological environments of dry valleys seriously affect the development of local society and Land 2023, 12, 1235 2 of 17 livelihood [8]. In recent years, soil quality assessment [9], soil and water conservation [10], and regional ecosystem restoration [11] have been the foci of research in these dry valleys. Despite the importance of ecosystems in the dry valleys, there is a lack of accurate data regarding the scope of dry valleys.…”

Section: Introductionmentioning

confidence: 99%

Geographically and Ontologically Oriented Scoping of a Dry Valley and Its Spatial Characteristics Analysis: The Case of the Three Parallel Rivers Region

Zhang

Tang

Shi

et al. 2023

Land

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A dry valley is a special landscape type that is formed by the combined effect of climate and topography. Accurately defining the scope of a dry valley and knowledge of its spatial distribution characteristics can provide data support for relevant studies in the region. Starting from natural ontological characteristics and formation mechanisms, we constructed a geographical ontological model of dry valleys through an analysis of concepts related to the dry valley and combined GIS technology and methods to accurately define the scope and analyze the spatial characteristics of the dry valleys in the Three Parallel Rivers Region (DVT). Our results show that: (1) The geographically and ontologically oriented method developed to define the scope of the dry valley has a high accuracy, with an overall accuracy of 92.3% and a kappa coefficient of 0.84, therefore it can provide a better mechanism for defining the scope of a dry valley on a large scale. (2) The total area and total length of the DVT are 6147.1 km2 and 2125.3 km, respectively. The dry valleys in this region are mainly located in the Tibet Autonomous Region and in the Sichuan and Yunnan provinces in China. (3) The terrain in the DVT is precipitous, and areas with slopes greater than 25° account for 70% of the total area of the dry valleys. The DVT area of sunny aspects (north, northeast, and northwest aspects) is larger than that of shady aspects (south, southeast, and southwest aspects), and the land cover is mainly grassland with a desert substrate. The result of our study can provide data support for further in-depth research in related fields of dry valleys.

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Comprehensive propagation characteristics between paired meteorological and hydrological drought events: Insights from various underlying surfaces

Chen,

Fan,

Zhang

et al. 2024

Atmospheric Research

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Physiological response and photosynthetic recovery to an extreme drought: Evidence from plants in a dry-hot valley savanna of Southwest China

Cited by 10 publications

References 67 publications

Climate and soil stressed elevation patterns of plant species to determine the aboveground biomass distributions in a valley-type Savanna

Climate and soil stressed elevation patterns of plant species to determine the aboveground biomass distributions in a valley-type Savanna

Geographically and Ontologically Oriented Scoping of a Dry Valley and Its Spatial Characteristics Analysis: The Case of the Three Parallel Rivers Region

Comprehensive propagation characteristics between paired meteorological and hydrological drought events: Insights from various underlying surfaces

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