增温对长白山苔原植物叶片和土壤矿质元素含量的影响  

Effects of warming onmineral element contents in leaves of dominant species and in soils in Changbai Mountain tundra

作　　者：江肖洁 耿春女[1] 韩建秋[1] 周玉梅[1] 

机构地区：[1]上海应用技术学院生态技术与工程学院,上海201418

出　　处：《生态学报》2016年第7期1928-1935,共8页Acta Ecologica Sinica

基　　金：国家自然科学基金资助项目(31170461)

摘　　要：温度变化会影响植物对养分的吸收以及自身养分含量变化,尤其对长期处于低温条件下的苔原植物。采用开顶箱增温法,研究了1个生长季增温对长白山苔原3种代表植物——牛皮杜鹃(Rhododendron aureum Pall)、笃斯越桔(Vaccinium uliginosum)和东亚仙女木(Dryas octopetala var.asiatica)叶片及土壤矿质元素钾(K)、铝(Al)、铜(Cu)、铁(Fe)、镁(Mg)、锰(Mn)、锌(Zn)和钙(Ga)含量的影响。结果表明:1)增温明显改变了土壤矿质元素含量,使土壤Fe、Al和K含量分别增加0.44%、2.76%和4.88%,而Cu、Mg、Mn、Zn和Ga含量分别降低2.63%、5.07%、7.46%、21.95%和15.60%;2)整个生长季,增温使牛皮杜鹃叶K含量增加8.17%,且具有明显的月变化,其叶Mg和Mn含量也分别比对照组高66.39%和14.73%;3)与对照相比,增温使笃斯越桔叶K、Al和Zn含量分别增加15.24%、5.45%和87.45%,生长季不同月份,其叶K、Al、Mg、Mn、Zn和Ga含量差异明显;4)增温并没有明显改变东亚仙女木叶片各矿质元素含量,但其叶K、Cu和Ga含量具有明显月波动。因此,不同物种矿质元素含量变化对增温的响应方式不同,增温对苔原植物的影响也存在一定的物种差异性。According to the fifth report of Intergovernmental Panel on Climate Change（ IPCC）,the average global temperature has increased by 0.78 ℃ between 2003 and 2013,compared with that between 1900 and 1950. It is well known that boreal or high latitude areas are more sensitive to warming. The vegetations in the tundra ecosystem have adapted to low temperatures and grown in conditions of limited nutrition. However,temperatures can influence the absorption and content of the nutrients. The aim of this study is to examine the responses of the mineral elements in the leaves of tundra plants to warming. The hexagon open-top chamber system was used to increase the air and soil temperatures during the growing season（ June to September）. The mean air temperature was increased by 1.41 ℃,and the soil temperature at depths of 5 cm and10 cm was increased by 1.74 and 1.78 ℃,respectively,during the growing season in 2013. The potassium（ K）,aluminum（ Al）,copper（ Cu）,iron（ Fe） and magnesium（ Mg）,manganese（ Mn）,zinc（ Zn）,and calcium（ Ga） contents in the soil and the leaves of Rhododendron aureum Pall,Vaccinium uliginosum,and Dryas octopetala var. Asiatica,three dominant plants in the Changbai Mountain tundra,were determined after warming treatment during three growing seasons. The results showed that： 1） warming significantly affected the mineral element content in the soils. The Fe,Al,and K contentsincreased by 0.44%,2.76%,and 4.88%,respectively. In contrast,the Cu,Mg,Mn,Zn,and Ga contents decreased by2.63%,5. 07%,7. 46%,5. 07%,and 7. 46%,respectively. 2） The K content in the leaves of Rhododendron aureum showed a significant seasonal change,with an average increase of 8.17% after warming during the whole growing season;however,this was not observed for the other mineral elements contents. Warming increased the Mg and Mn contents of the leaves of Rhododendron aureum by 66.39% and 14.73%,respectively,compared with the control. 3） The contents of K,Al,and Zn in the leaves of Vacciniu

关 键 词：长白山 苔原 增温 矿质元素 

分 类 号：Q945.79[生物学—植物学]