纬度梯度移栽对兴安落叶松针叶暗呼吸温度敏感性的影响  

Effects of latitudinal transplanting on temperature sensitivity of leaf dark respiration for Larix gmelinii

作　　者：万丽娜 王传宽[1,2] 全先奎 WAN Li-na;WANG Chuan-kuan;QUAN Xian-kui(Center for Ecological Research,Northeast Forestry University,Harbin 150040,China;Ministry of Education Key Laboratory of Sustainable Forest Ecosystem Management,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学生态研究中心,哈尔滨150040 [2]森林生态系统可持续经营教育部重点实验室,哈尔滨150040

出　　处：《应用生态学报》2019年第5期1659-1666,共8页Chinese Journal of Applied Ecology

基　　金：中央高校基本科研业务费专项(2572017CY01);黑龙江省青年科学基金项目(QC2016020);国家科技支撑项目(2011BAD37B01)资助~~

摘　　要：叶片暗呼吸温度敏感性对研究森林生态系统碳循环及其对气候变化的响应具有重要意义,但其树种内的变异性及季节动态还不清楚.本研究于2018年在同质园内测定了移栽自4个纬度(塔河、松岭、黑河和带岭)的兴安落叶松针叶的暗呼吸温度敏感系数(Q_(10)),旨在探索来自不同气候条件树木的Q_(10)的种内变异性及季节动态.结果表明:4个移栽地的Q_(10)具有明显的季节动态,其最大值均出现在生长季中期.4个移栽地树木的Q_(10)存在显著差异,其变动范围为(1.48±0.01)～(2.15±0.03),并且在每个生长季阶段中差异的变化格局一致,即来自低纬度高温地区的树木Q_(10)值较大.Q_(10)与针叶氮浓度、可溶性糖浓度、移栽地年均气温和年均降水量间均存在显著正相关关系.综上,Q_(10)在移栽地之间的差异及其季节动态主要由针叶养分含量和树木对移栽原地气候的长期适应引起的,这些因素在森林碳循环对气候变化响应的模型和预测中应该予以考虑.Exploring the temperature sensitivity of leaf dark respiration is of significance for understanding forest carbon cycling and its response to climate change.However,its intra-specific variability and seasonality are not clear yet.In this study,we measured the temperature sensitivity coefficient(Q10)of leaf dark respiration for Dahurian larch(Larix gmelinii)that were transplanted from four latitudinal sites(i.e.,Tahe,Songling,Heihe,and Dailing)in a common garden.Our specific aims were to explore the seasonal dynamics of Q10 and compare differences in Q10 among the indivi-duals from the four latitudinal sites.The results showed that the Q10 for the four sites exhibited similar seasonal trend,with the maximum Q10 in the middle growing season.The inter-site difference in Q10 was significant,ranging from(1.48±0.01)to(2.15±0.03).Furthermore,the inter-site difference showed the same pattern across the whole growing season,i.e.,the warmer and lower latitudinal sites,the higher Q10.The Q10 was significantly and positively correlated with foliar nitrogen concentration and soluble sugar concentration,and mean annual temperature and mean annual precipitation in the transplanting sites.These findings suggested that the inter-site variation in Q10 and its seasonality could be mainly attributed to the foliar nutrient concentration andadaptation of trees to the climatic conditions of the transplanting sites,which should be considered in modeling and predicting responses of forest carbon cycling to climate change.

关 键 词：气候变化 兴安落叶松 适应 移栽 同质园 

分 类 号：S791.222[农业科学—林木遗传育种]