文献类型：期刊文献

中文题名：7年穿透雨减少对锐齿槲栎光合固碳及生物量碳储量的影响

英文题名：Effects of 7 years throughfall exclusion on photosynthetic carbon sequestration and biomass carbon storage of Quercus aliena var.acuteserrata

作者：刘翠菊[1,2] 陈志成[1,2] 刘世荣[1,2] 高小敏[1,2] 牛保亮[1,2] 刘晓静[2,3] 白兵勇[2,3]

第一作者：刘翠菊

机构：[1]中国林业科学研究院森林生态环境与自然保护研究所,国家林业和草原局森林生态环境重点实验室,北京100091;[2]河南宝天曼森林生态系统国家野外科学观测研究站,南阳473000;[3]河南宝天曼国家级自然保护区管理局,内乡474350

年份：2024

卷号：44

期号：5

起止页码：1904-1917

中文期刊名：生态学报

外文期刊名：Acta Ecologica Sinica

收录：CSTPCD;;Scopus;北大核心:【北大核心2023】；CSCD:【CSCD2023_2024】；

基金：科技部重点研发项目(2021YFD2200405)。

语种：中文

中文关键词：气候变化;降雨减少;光合作用;水分利用效率;碳储量

外文关键词：climate change;precipitation decline;photosynthesis;water use efficiency;carbon storage

分类号：S51

摘要：气候变化背景下不断加剧的干旱事件对树木的生长及碳积累产生显著影响。然而,树木光合固碳能力及生物量碳储量对相对长期干旱的连续响应机制的研究仍然有限。选择70年生的天然锐齿槲栎(Quercus aliena var.acuteserrata)林,探究长期模拟穿透雨减少对锐齿槲栎光合固碳潜力和生物量碳储量的影响。研究结果表明,连续7年的穿透雨减少处理显著降低了锐齿槲栎的光合固碳能力,其叶片净光合速率(A)、最大羧化速率(V_(cmax))、最大电子传递速率(J_(max))、最大光化学效率(F_(v)/F_(m))均明显降低,且穿透雨减少处理增强了A与气孔导度(g_(s))、J_(max)、F_(v)/F_(m)之间的相关性。在适应长期干旱过程中,锐齿槲栎通过增加比叶面积(SLA)、叶片栅栏组织与海绵组织的比值、气孔密度等叶片形态及结构特性变化,降低冠层叶面积(LAI)指数和蒸腾水分散失及提高水分利用效率(WUE)缓解和适应干旱胁迫的不利影响。但是,长期穿透雨减少仍然降低了锐齿槲栎的生物量碳储量。穿透雨减少处理7年后,叶生物量碳下降30.6%、茎生物量碳下降34.3%、地下生物量碳下降26.4%,总生物量碳下降32.8%。同时,地下/地上生物量碳比值显著提高,表明锐齿槲栎通过增加地下碳投入和生长适应干旱胁迫。在未来降雨格局变化下,锐齿槲栎生长及叶性状的适应性调整是该树种能够长期生存的重要策略。研究为评价全球气候干化背景下暖温带锐齿槲栎林光合固碳能力和碳储量的变化提供了科学依据。
In the context of climate change,the increasing drought events have important impacts on tree growth and carbon storage.However,studying on response mechanisms of the leaf photosynthetic carbon sequestration and biomass carbon storage of trees to the prolonged drought conditions is still limited.In this study,a 70?year?old natural deciduous oak(Quercus aliena var.acuteserrata)forest was selected to carry out a long?term throughfall exclusion(TFE)experiment to investigate the responses of photosynthetic carbon sequestration and carbon sink potential after long?term TFE treatment.In this study,the results showed that TFE treatment significantly reduced the net photosynthetic rate(A),maximum photochemical efficiency(V_(cmax)),maximum electron transport rate(J_(max)),and maximum quantum efficiency of PSII(F_(v)/F_(m))in leaf of Q.aliena var.acuteserrata.And the correlation between A and gs,J_(max) and F_(v)/F_(m) of Q.aliena var.acuteserrata was enhanced by the long?term TFE treatment.That is,the seven consecutive years of the TFE treatment significantly reduced the photosynthetic carbon sequestration capacity of Q.aliena var.acuteserrata.On the one hand,the Q.aliena var.acuteserrata alleviated and adapted the adverse TFE treatment effects by increasing specific leaf area(SLA),ratio of leaf palisade tissue to spongy tissue,and stomatal density.On the other hand,the Q.aliena var.acuteserrata reduced the leaf area index(LAI)and transpiration water loss after the TFE treatments,which could improve the water use efficiency(WUE)of Q.aliena var.acuteserrata under the long?term drought stress.However,our study found that the long?term TFE treatment still reduced the biomass carbon storage,and the biomass carbon of all organs in Q.aliena var.acuteserrata decreased significantly.In this study,the leaf biomass carbon decreased by 30.6%,stem biomass carbon decreased by 34.3%,underground biomass carbon decreased by 26.4%,and total biomass carbon decreased by 32.8%after 7 years of the TFE treatment.The significant increase in the ratio of belowground to aboveground biomass carbon indicated that Q.aliena var.acuteserrata adapted drought stress by increasing underground growth along with increasing carbon input.In the context of changing rainfall pattern in the future,the adaptive adjustment of the growth and leaf traits of oak forest is an important strategy for its long?term survival.The study provides a scientific basis for evaluating the changes of photosynthetic carbon sequestration capacity and carbon storage of warm temperate forest ecosystems under the drought stress induced by global climate change.