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
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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(Q_(10)) 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 Q_(10) and compare differences in Q_(10) among the indivi-duals from the four latitudinal sites. The results showed that the Q_(10) for the four sites exhibited similar seasonal trend, with the maximum Q_(10) in the middle growing season. The inter-site difference in Q_(10 )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 Q_(10). The Q_(10) 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 Q_(10) 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.
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(Q_(10)) 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 Q_(10) and compare differences in Q_(10) among the indivi-duals from the four latitudinal sites. The results showed that the Q_(10) for the four sites exhibited similar seasonal trend, with the maximum Q_(10) in the middle growing season. The inter-site difference in Q_(10 )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 Q_(10). The Q_(10) 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 Q_(10) 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.
引文
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[32] Gunderson CA,Norby RJ,Wullschleger SD.Acclimation of photosynthesis and respiration to simulated climatic warming in northern and southern populations of Acer saccharum:Laboratory and field evidence.Tree Physiology,2000,20:87-96
[33] Martijn S,Joana ZC,Owenk A.Transient shade and drought have divergent impacts on the temperature sensitivity of dark respiration in leaves of Geum urbanum.Functional Plant Biology,2008,35:1135-1146
[34] Drake JE,Aspinwall MJ,Pfautsch S,et al.The capacity to cope with climate warming declines from temperate to tropical latitudes in two widely distributed Eucalyptus species.Global Change Biology,2015,21:459-472
[35] Wang Z-G (王兆国),Wang C-K (王传宽).Temporal dynamics and influencing factors of leaf respiration for three temperate tree species.Acta Ecologica Sinica (生态学报),2013,33(5):1456-1464 (in Chinese)
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[2] Le QC,Andrew R,Canadell J,et al.Global carbon budget 2016.Earth System Science Data,2016,8:605-649
[3] Smith NG,Dukes JS.Plant respiration and photosynthesis in global-scale models:Incorporating acclimation to temperature and CO2.Global Change Biology,2013,19:45-63
[4] Cox PM,Betts RA,Jones CD,et al.Acceleration of global warming due to carbon-cycle feedbacks in a coupled climate model.Nature,2000,408:184-187
[5] Fung IY,Doney SC,Keith L,et al.Evolution of carbon sinks in a changing climate.Proceedings of the National Academy of Sciences of the United States of America,2005,102:11201-11206
[6] Atkin OK,Tjoelker MG.Thermal acclimation and the dynamic response of plant respiration to temperature.Trends in Plant Science,2003,8:343-351
[7] Slot M,Kitajima K.General patterns of acclimation of leaf respiration to warmer temperatures across biomes and plant types.Oecologia,2015,177:885-900
[8] Reich PB,Sendall KM,Stefanski A,et al.Boreal and temperate trees show strong acclimation of respiration to warming.Nature,2016,53:633-636
[9] Sun J-W (孙金伟),Yuan F-H (袁凤辉),Guan D-X(关德新),et al.Dark respiration of terrestrial vegetations.Chinese Journal of Applied Ecology (应用生态学报),2013,24(6):1739-1746 (in Chinese)
[10] Cavaleri MA,Oberbauer SF,Ryan MG.Foliar and ecosystem respiration in an old-growth tropical rain forest.Plant,Cell and Environment,2008,31:473-483
[11] Oleksyn J,Modrzynski J,Tjoelker M,et al.Growth and physiology of Picea abies populations from elevational transects:Common garden evidence for altitudinal ecotypes and cold adaptation.Functional Ecology,1998,12:573-590
[12] Quan XK,Wang CK.Acclimation and adaptation of leaf photosynthesis,respiration and phenology to climate change:A 30-year Larix gmelinii common-garden experiment.Forest Ecology and Management,2018,411:166-175
[13] Reich PB,Sendall KM,Rice K,et al.Geographic range predicts photosynthetic and growth response to warming in co-occurring tree species.Nature Climate Change,2015,5:148-152
[14] Dusenge ME,Duarte AG,Way DA.Plant carbon metabolism and climate change:Elevated CO2 and temperature impacts on photosynthesis,photorespiration and respiration.New Phytologist,2019,221:32-49
[15] Warren CR.Does growth temperature affect the temperature responses of photosynthesis and internal conduc-tance to CO2?A test with Eucalyptus regnans.Tree Phy-siology,2008,28:11-19
[16] Way DAS,Rowan F.Thermal acclimation of photosynthesis in black spruce [Picea mariana (Mill.) BSP].Plant,Cell and Environment,2010,31:1250-1262
[17] Crous KY,Wallin G,Atkin OK,et al.Acclimation of light and dark respiration to experimental and seasonal warming are mediated by changes in leaf nitrogen in Eucalyptus globulus.Tree Physiology,2017,37:1069-1083
[18] Xu Z-F (徐振锋),Hu T-X (胡庭兴),Zhang L (张力),et al.Effects of simulated warming on the growth,leaf phenology,and leaf traits of Salix eriostachya in sub-alpine timberline ecotone of Western Sichuan,China.Chinese Journal of Applied Ecology (应用生态学报),2009,20(1):7-12 (in Chinese)
[19] Way DA,Oren R,Kroner Y.The space-time continuum:The effects of elevated CO2 and temperature on trees and the importance of scaling.Plant,Cell and Environment,2015,38:991-1007
[20] Atkin OK,Bloomfield KJ,Reich PB,et al.Global variability in leaf respiration in relation to climate,plant functional types and leaf traits.New Phytologist,2015,206:614-636
[21] Heskel MA,Greaves HE,Turnbull MH,et al.Thermal acclimation of shoot respiration in an Arctic woody plant species subjected to 22 years of warming and altered nutrient supply.Global Change Biology,2014,20:2618-2630
[22] Lee T,Reich P,Bolstad P.Acclimation of leaf respiration to temperature is rapid and related to specific leaf area,soluble sugars and leaf nitrogen across three temperate deciduous tree species.Functional Ecology,2005,19:640-647
[23] Meziane D,Shipley B.Interacting components of interspecific relative growth rate:Constancy and change under differing conditions of light and nutrient supply.Functional Ecology,1999,13:611-622
[24] Lewis JD,Phillips NG,Logan BA,et al.Leaf photosynthesis,respiration and stomatal conductance in six Eucalyptus species native to mesic and xeric environments growing in a common garden.Tree Physiology,2011,31:997-1006
[25] Robson TM,Sánchez-Gómez D,Cano FJ,et al.Variation in functional leaf traits among beech provenances during a Spanish summer reflects the differences in their origin.Tree Genetics & Genomes,2012,8:1111-1121
[26] Heskel MA,O’Sullivan OS,Reich PB,et al.Convergence in the temperature response of leaf respiration across biomes and plant functional types.Proceedings of the National Academy of Sciences of the United States of America,2016,113:3832-3837
[27] Vanderwel MC,Slot M,Lichstein JW,et al.Global convergence in leaf respiration from estimates of thermal acclimation across time and space.New Phytologist,2015,207:1026-1037
[28] Scafaro AP,Xiang S,Long BM,et al.Strong thermal acclimation of photosynthesis in tropical and temperate wet-forest tree species:The importance of altered Rubisco content.Global Change Biology,2017,23:2783-2800
[29] Soolanayakanahally RY,Guy RD,Silim SN,et al.Enhanced assimilation rate and water use efficiency with latitude through increased photosynthetic capacity and internal conductance in balsam poplar (Populus balsamifera L.).Plant,Cell and Environment,2009,32:1821-1832
[30] Tjoelker MG,Oleksyn J,Reich PB,et al.Coupling of respiration,nitrogen,and sugars underlies convergent temperature acclimation in Pinus banksiana across wide-ranging sites and populations.Global Change Biology,2008,14:782-797
[31] Atkin OK,Bruhn D,Hurry VM,et al.The hot and the cold:Unravelling the variable response of plant respiration to temperature.Functional Plant Biology,2005,32:87-105
[32] Gunderson CA,Norby RJ,Wullschleger SD.Acclimation of photosynthesis and respiration to simulated climatic warming in northern and southern populations of Acer saccharum:Laboratory and field evidence.Tree Physiology,2000,20:87-96
[33] Martijn S,Joana ZC,Owenk A.Transient shade and drought have divergent impacts on the temperature sensitivity of dark respiration in leaves of Geum urbanum.Functional Plant Biology,2008,35:1135-1146
[34] Drake JE,Aspinwall MJ,Pfautsch S,et al.The capacity to cope with climate warming declines from temperate to tropical latitudes in two widely distributed Eucalyptus species.Global Change Biology,2015,21:459-472
[35] Wang Z-G (王兆国),Wang C-K (王传宽).Temporal dynamics and influencing factors of leaf respiration for three temperate tree species.Acta Ecologica Sinica (生态学报),2013,33(5):1456-1464 (in Chinese)
[36] Araki MG,Gyokusen K,Kajimoto T.Vertical and seasonal variations in temperature responses of leaf respiration in a Chamaecyparis obtusa canopy.Tree Physiology,2017,37:1269-1284