土壤增温对杉木幼苗细根生理生态性质的影响  

Effects of soil warming on the ecophysiological properties of the fine roots of Chinese fir( Cunninghamia lanceolata) seedlings

作　　者：冯建新[1,2] 熊德成[1,2] 史顺增 许辰森 钟波元 邓飞[1,2] 陈云玉[1,2] 陈光水[1,2] 杨玉盛[1,2] 

机构地区：[1]福建师范大学地理科学学院,福州350007 [2]福建师范大学湿润亚热带山地生态国家重点实验室培育基地,福州350007

出　　处：《生态学报》2017年第1期35-43,共9页Acta Ecologica Sinica

基　　金：国家自然科学基金优秀青年基金项目(31422012);国家973前期专项课题(2014CB460602);福建省杰出青年基金项目滚动资助项目(2014J07005)

摘　　要：为了揭示我国最重要人工林树种杉木对全球变暖的地下响应及其适应性,通过在福建省三明市陈大国有林场设置杉木(Cunninghamia lanceolata)幼苗土壤增温实验(增温+5℃和不增温两个处理,各5个重复),用土钻法和内生长环法探讨土壤增温约1年后的杉木幼苗细根生物量和形态特征(比根长,SRL;比表面积,SRA),化学计量学特征(C、N、P)和代谢特征(包括呼吸和非结构性碳水化合物,NSC)的变化。结果表明:1)与对照相比,土壤增温处理0—1 mm细根生物量显著下降,1—2 mm细根生物量没有变化,细根形态亦未有显著变化;2)土壤增温处理细根N浓度显著增加,细根P浓度没有显著变化,细根C/N显著降低而N/P显著增加;3)土壤增温处理细根呼吸没有出现驯化现象,细根NSC显著下降。可见,土壤增温改变了杉木细根生物量分配格局,并引起一定的营养失衡和代谢失衡现象,从而对杉木生长和生产力产生影响。Global warming is expected to have profound effects on plant growth. The effects of global climate change on the aboveground parts of plants have been reported in many studies in the past decades. However, limited information regarding how warming affects belowground ecological processes, especially root dynamics, has restricted our ability to predict how roots will respond to increasing temperatures. Changes in ecophysiological properties of fine roots under climate change may play an important part in the growth performance of tree plantations. The aim of the present study was to explore the belowground responses and adaptability of the most important timber species in southern China, the Chinese fir （Cunninghamia lanceolata） to global warming. A field soil cable warming experiment was conducted in Chenda State-Own Forest Farm, Sanming, Fujian Province. The experiment included two treatments：soil warming （＋5℃） and no-warming （control）, and each treatment had 5 replicate plots. We measured changes in fine root biomass, morphology （specific root length and specific root surface area）, stoichiometry （C, N, P） and metabolisme （including root respiration and nonstructural carbohydrates （NSCs）） after approximately one year of soil warming using soil coring and ingrowth core methods. Soil core diameters were 3.5 cm and were divided into 0-10, 10-20, 20-40, and 40-60 cm. Ingrowth core diameters were 20 cm and were divided into 0-10 and 10-20 cm. A two-way ANOVA showed that treatmentdiameter class significantly effected the fine root biomass, C and N concentrations, and C/N ratio, whereas it had no effect on the fine root morphology, P concentration, C/P ratio, and metabolism. The one-way ANOVA showed that （1） campared with the control plots, the 0-1 mm fine root biomass increased significantly, whereas the 1-2 mm fine root biomass and fine root morphology did not change in warmed soil plots. These findings indicated that the root system adjusted the fine root biomass, especially th

关 键 词：土壤增温 细根 生物量 形态 化学计量学 呼吸 非结构性碳水化合物 

分 类 号：S791.27[农业科学—林木遗传育种]