生态学报2025，Vol.45Issue(7)：3353-3369,17.DOI:10.20103/j.stxb.202310192275
气候和景观多样性对青藏高原草地植物多样性与生物量的影响
Effects of climate and landscape diversity on grassland plant diversity and biomass on the Qinghai-Tibet Plateau
摘要
Abstract
The Qinghai-Tibet Plateau has been an important ecological security barrier area and high-altitude pastoral area in Asia.It is rich in biodiversity resources and fragile ecological environment,and is sensitive to climate change and human activities.This study conducted plantcommunity surveys and sampling across different latitudes and altitudes(3,000-5,000 m)on the Qinghai-Tibet Plateau.The measurements included species diversity,functional diversity,and above ground biomass.Additionally,calculations were performed to determine the multi-year mean values,multi-year change rates,and variation coefficients of monthly mean temperature and precipitation,along with the landscape diversity index to reflect the ecosystem's type diversity in the sampling area.The analysis aimed to reveal the relationship between plant diversity and the productivity of grassland under large-scale environmental gradients.Findings based on the assessment of environmental changes and functional traits indicate the following:(1)The trend of warming and drying is obvious in southern Tibet and near Namtso.The variability of precipitation in the marsh meadow near Namtso Lake and the grassland temperature variability in the alpine grassland of the Qinghai southeastern were high.The mountainous meadow of forest-grassland ecotone in the Qilian Mountains showed the highest diversity among the sampling sites.(2)The plant height and average leaf coverage per plant demonstrated consistent response to climatic factors and landscape diversity,with the former being more sensitive.Climate factor variations exhibited a negative correlation with plant height and leaf coverage,while locations with high landscape diversity displayed higher plant height and leaf coverage.(3)Sites with high variability of climate factors had lower functional diversity,weighted average plant height,and leaf coverage in the community.This implies that an unstable climate environment reduces the level of community diversity.Higher change rates of climate factors were associated with increased levels of functional diversity,reflecting the adaptive process of grassland plant communities in stabilizing themselves through diversified species functional traits under accelerated environmental change.(4)Landscape diversity exhibited a positive correlation with species diversity and grassland biomass,indicating that the diversity of the grassland landscape diversity promotes species diversity and biomass accumulation.(5)Most plant diversity indexes demonstrated a direct proportionality with grassland biomass,confirming the positive effect of grassland diversity on productivity.Our study contributes in understanding the formation and influencing factors of biodiversity patterns in alpine steppe under different gradient climate and landscape environments on the Qinghai-Tibet Plateau.Moreover,it provides a theoretical basis and valuable references for studying diversity protection under environmental change and informing decision-making processes.关键词
青藏高原/气候因子/景观多样性/生物多样性/功能多样性/生物量Key words
the Qinghai-Tibet Plateau/climatic factors/landscape diversity/biodiversity/functional diversity/biomass引用本文复制引用
李生梅,李周园,杨路遥,齐雯潇,高如意,沈其瑜,王子滢,武胜男,李耀琪,董世魁..气候和景观多样性对青藏高原草地植物多样性与生物量的影响[J].生态学报,2025,45(7):3353-3369,17.基金项目
国家重点研发项目(2023YFF1304305,2019QZKK0307) （2023YFF1304305,2019QZKK0307）
大学生创新创业项目(X202310022376) （X202310022376）
国家自然科学基金项目(32101324) （32101324）
