生态学报2024，Vol.44Issue(11)：4865-4875,11.DOI:10.20103/j.stxb.202312222785
青藏高原高寒草地不同植物功能群与土壤碳同位素特征及影响因素
Characteristics and main drivers of different plant functional groups and soil carbon isotopes across alpine grassland of the Tibetan Plateau
摘要
Abstract
The Tibetan Plateau,characterized by its high altitude and extensive area,is one of the most prototypical alpine regions in the world.Exploring the characteristics and determinants of carbon stable isotope composition(δ13 C)in plants and soil across its alpine grasslands holds significant implications for comprehensively understanding carbon cycling processes within this unique ecosystem.Our study entailed the collection and measurement of carbon stable isotope natural abundances of plants and soils from 135 grassland sites across the Tibetan Plateau.The δ13 C characteristics of different plant functional groups and surface soil(0-10 cm)were measured,and the relationships between δ13 C abundances and climate,edaphic factors were determined.The results showed that:(1)The δ13 C in Forb was significantly lower than that in Poaceae,Cyperaceae and Fabaceae(P＜0.05).The δ13 C of surface soil was significantly positively correlated with that in Poaceae,Cyperaceae and Fabaceae(P＜0.05),but not with that in Forb.The sensitivity of surface soil δ13 C to the three plant functional groups followed the order of Poaceae＞Fabaceae＞Cyperaceae.(2)Analysis of environmental factors influencing δ13 C in Poaceae,Cyperaceae,Fabaceae,and surface soil indicated that a greater relative contribution of climate factors over edaphic factors,with solar radiation exerting the most substantial influence among climatic factors.Notably,no significant correlation was detected between the δ13 C of Forb and climatic,edaphic factors.Our results also underscored solar radiation as a pivotal determinant of the δ13 C characteristics in plants and surface soil.These findings can provide valuable empirical data and theoretical insights for the δ13 C characteristics and organic carbon dynamic cycle of plants and soil in alpine grassland ecosystems.关键词
青藏高原/碳稳定同位素/植物功能群/表层土壤Key words
Tibetan Plateau/stable carbon isotope/plant functional group/surface soil引用本文复制引用
王业迪,王迎新,陈哲,田琳琳,孙建..青藏高原高寒草地不同植物功能群与土壤碳同位素特征及影响因素[J].生态学报,2024,44(11):4865-4875,11.基金项目
第二次青藏高原综合科学考察研究(2019QZKK0405) （2019QZKK0405）
