文献类型： 外文期刊

作者： He, Guangxiong ¹ ; Shi, Zhengtao ¹ ; Fang, Haidong ² ; Shi, Liangtao ² ; Wang, Yandan ² ; Yang, Haozhou ² ; Yan, Bangguo ² ; Yang, Chaolei ⁵ ; Yu, Jianlin ² ; Liang, Qiaoling ¹ ; Zhao, Lei ¹ ; Jiang, Qin ¹ ;

作者机构： 1.Yunnan Normal Univ, Fac Geog, Yunnan Key Lab Plateau Geog Proc & Environm Change, Kunming, Yunnan, Peoples R China

2.Yunnan Acad Agr Sci, Trop Eco Agr Res Inst, Yuanmou, Yunnan, Peoples R China

3.Yunnan Acad Agr Sci, Yuanmou Dry Hot Valley Bot Garden, Yuanmou, Yunnan, Peoples R China

4.Yunnan Acad Agr Sci, Natl Soil & Water Conservat Sci & Technol Demonstr, Yuanmou, Yunnan, Peoples R China

5.Kunming Gen Survey Nat Resources Ctr, China Geol Survey, Kunming, Yunnan, Peoples R China

关键词： species diversity; aboveground biomass; valley-type Savanna; RDA; environmental variables and factors

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.6； 五年影响因子：6.8 ）

ISSN： 1664-462X

年卷期： 2024 年 15 卷

页码：

收录情况： SCI

摘要： Introduction Extreme 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.Methods The 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 discussion The 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.