生态学报2024，Vol.44Issue(5)：2115-2126,12.DOI:10.20103/j.stxb.202301110075
青藏高原草本沼泽植被净初级生产力时空变化及其对气候变化的响应
Spatio-temporal variation in vegetation net primary productivity and its response to climate change in herbaceous marshes on the Qinghai-Tibet Plateau
摘要
Abstract
Herbaceous marshes have a faster rate of carbon sequestration than other types of marshes and play an essential role in regulating the regional carbon cycle and climate change.As a sensitive region to climate change,the Qinghai-Tibetan Plateau has large areas of herbaceous marshes,which are important for ecological security and carbon cycle in East Asia.Vegetation net primary productivity(NPP)is an important indicator of the carbon sequestration capacity of marsh ecosystems.Climate change can significantly affect the NPP of marsh ecosystems.Under the background of global climate change,the change of NPP in herbaceous marshes vegetation and its response mechanism to climate change on the Qinghai-Tibet Plateau are not clear.In this study,NPP data and meteorological data from 2000 to 2020 were used to analyze the temporal and spatial variation of the NPP in herbaceous marshes vegetation and its response to climate change on the Qinghai-Tibet Plateau.The results showed that the annual average NPP of herbaceous marshes vegetation was 122.80 g C/m2.The annual NPP of herbaceous marshes vegetation presented a significant increase trend(0.79 g C m-2 a-1)from 2000 to 2020,and the most significant increase was mainly concentrated in the northern part of the study area.The NPP of herbaceous marshes vegetation on the Qinghai-Tibet Plateau was mainly affected by the average annual temperature,and the effect of average annual precipitation on the NPP of herbaceous marshes vegetation was not significant.In different seasons,summer and autumn warming could significantly increase marsh NPP,and the increase of nighttime minimum temperature in summer had a larger positive effect on the NPP of herbaceous marshes than the daytime maximum temperature in summer.By contrast,the increase of daytime maximum temperature in autumn had a larger positive effect on the NPP of herbaceous marshes than the nighttime minimum temperature in autumn.This study highlights the different effects of seasonal climate changes on the NPP of herbaceous marshes in the Qinghai-Tibetan Plateau.Under the background of global diurnal asymmetric warming(faster warming trend during the night than during the day),when simulating the NPP of herbaceous marshes in the future,we should also focus on the different effects of day and night temperature changes on the vegetation growth of herbaceous marshes.The results are helpful to evaluate the carbon sequestration potential of herbaceous marshes and provide theoretical guidance for the ecological conservation of herbaceous marshes on the Qinghai-Tibet Plateau.关键词
草本沼泽/植被/净初级生产力/气候变化/青藏高原Key words
herbaceous marshes/vegetation/Net Primary Productivity/climate change/Qinghai-Tibet Plateau引用本文复制引用
吴丽媛,神祥金,刘奕雯,马蓉,张佳琦,丁辰,吕宪国,姜明..青藏高原草本沼泽植被净初级生产力时空变化及其对气候变化的响应[J].生态学报,2024,44(5):2115-2126,12.基金项目
国家自然科学基金项目(41971065,4237012146) （41971065,4237012146）
吉林省自然科学基金项目(20210101104JC) （20210101104JC）
中国科学院前沿科学重点研究计划项目(ZDBS-LY-7019) （ZDBS-LY-7019）
