塔里木河下游胡杨与土壤碳储量特征及影响因素OA

Forests play a significant role as carbon sinks and are crucial for achieving China's dual carbon goals.This study focuses on Populus euphratica forests in the lower reaches of the Tarim River,specifically analyzing the spatial distribution of carbon storage in P.euphratica and soil,as well as the influencing factors,based on bio-mass allometric growth models.The results show that:(1)carbon storage in individual P.euphratica trees in the study area ranges from 1.71 to 502.32 kg·hm-2,with aboveground and belowground carbon storage ranging from 1.16 to 448.61 kg·hm-2 and from 0.55 to 53.71 kg·hm-2,respectively.Carbon storage in P.euphratica is mainly influenced by soil water content,total nitrogen,organic carbon,distance from the river channel,and tree age.As distance from the river channel increases,the root-to-shoot ratio decreases,whereas carbon storage both aboveg-round and belowground increases.Moreover,carbon storage aboveground is positively correlated with that below-ground(R2=0.99).Carbon storage in individual trees increases with increasing distance from the river channel and tree age.(2)Soil carbon storage exhibits significant spatial heterogeneity(P<0.05),increasing with soil depth and decreasing with increasing distance from the river channel,and is primarily influenced by total nitrogen and soil water content.(3)Soil physicochemical properties are common factors affecting carbon storage both in P.eu-phratica and soil,with soil water content and total nitrogen showing the strongest correlation with carbon storage in P.euphratica.This study elucidates the distribution patterns of carbon storage in P.euphratica forests as well as the influencing factors,providing important insights for research on carbon cycling in regional riparian forest ecosystems.