不同土壤水分条件下香樟凋落叶覆盖对土壤碳氮循环的影响
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摘要
凋落物作为森林生态系统碳库的重要组成部分对森林土壤碳、氮循环具有重要作用.为探讨香樟凋落叶对土壤碳、氮循环的影响,室内模拟研究了10%、20%和30%3种土壤含水量条件下香樟凋落叶覆盖森林土壤中碳、氮元素的变化.结果表明:3种含水量条件下香樟凋落叶覆盖均显著增加了土壤CO2排放速率和土壤溶解性有机碳(WSOC)含量,但显著降低了土壤中硝态氮含量,表明香樟凋落叶覆盖能够增强土壤呼吸强度和碳矿化,抑制土壤硝化作用;香樟凋落叶覆盖能够显著增加10%含水量土壤中铵态氮含量,但降低了20%和30%含水量土壤铵态氮含量,表明香樟凋落叶覆盖对土壤铵态氮含量的影响与土壤含水量有关.香樟凋落叶中部分单萜烯浓度在不同土壤含水量条件下分别与土壤CO2排放速率和铵态氮含量呈显著正相关,而与土壤WSOC和硝态氮含量呈显著负相关,说明香樟凋落叶覆盖对土壤碳、氮循环的影响可能与凋落叶中的单萜烯有关.
Litter,as an important carbon stock,plays a significant role in carbon and nitrogen cycle in forest soil. To examine the effects of Cinnamomum camphora leaf litter on soil carbon and nitrogen cycles,the contents of carbon and nitrogen were investigated in C. camphora leaf litter-covered forest soils with the water content of 10%,20% and 30% under laboratory-controlled condition. The results showed that leaf litter cover significantly increased both soil CO2 emission rates and water soluble organic carbon( WSOC) content,but decreased soil nitrate nitrogen content under the three water conditions,indicating that leaf litter cover could improve soil respiration and carbon mineralization but inhibit soil nitration. Leaf litter cover significantly enhanced the content of soil ammonium with the water content of 10%,but reduced those in soils with water content of 20% and 30%,revealing that the effects of leaf litter cover on soil ammonium nitrogen contents was dependent on soil water content. The content of some monoterpenes in leaf litter had a significantly positive correlation with soil CO2 emission rate and ammonium content,but a prominently negative relation with soil WSOC and nitrate content,implying that the effects of leaf litter cover on soil carbon and nitrogen cycles might be attributed to monoterpenes in leaf litter.
Litter,as an important carbon stock,plays a significant role in carbon and nitrogen cycle in forest soil. To examine the effects of Cinnamomum camphora leaf litter on soil carbon and nitrogen cycles,the contents of carbon and nitrogen were investigated in C. camphora leaf litter-covered forest soils with the water content of 10%,20% and 30% under laboratory-controlled condition. The results showed that leaf litter cover significantly increased both soil CO2 emission rates and water soluble organic carbon( WSOC) content,but decreased soil nitrate nitrogen content under the three water conditions,indicating that leaf litter cover could improve soil respiration and carbon mineralization but inhibit soil nitration. Leaf litter cover significantly enhanced the content of soil ammonium with the water content of 10%,but reduced those in soils with water content of 20% and 30%,revealing that the effects of leaf litter cover on soil ammonium nitrogen contents was dependent on soil water content. The content of some monoterpenes in leaf litter had a significantly positive correlation with soil CO2 emission rate and ammonium content,but a prominently negative relation with soil WSOC and nitrate content,implying that the effects of leaf litter cover on soil carbon and nitrogen cycles might be attributed to monoterpenes in leaf litter.
引文
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[24]Gong B(龚斌),Wang F-Y(王风玉),Zhang J-P(张继平),et al.Diurnal changes of soil respiration of mid-subtropical forest and its relationship with soil temperature and humidity.Ecology and Environmental Sciences(生态环境学报),2013,22(8):1275-1281(in Chinese)
[25]Lyu H-B(吕海波),Liang Z-S(梁宗锁).Effect of different soil water contents on soil respiratory intensity of Robinia pseudoacacia forest in loess area.Bulletin of Soil and Water Conservation(水土保持通报),2013,33(1):44-48(in Chinese)
[26]Park JH,Kalbitz K,Matzner E.Resource control on the production of dissolved organic carbon and nitrogen in a deciduous forest floor.Soil Biology&Biochemistry,2002,34:813-822
[27]Cai D(蔡丹),Yang X-H(杨秀虹),Lei Q-S(雷秋霜),et al.Field decomposition and dissolved organic matter release dynamics in leaf litter of typical trees in South China.Chinese Journal of Applied Ecology(应用生态学报),2016,27(9):2823-2830(in Chinese)
[28]He H,Song QM,Wang YF,et al.Phytotoxic effects of volatile organic compounds in soil water taken from a Eucalyptus urophylla plantation.Plant and Soil,2014,377:203-215
[29]Sidorenko ML,Buzoleva LS.Character of interactions of saprophytic soil microflora via gaseous metabolites.Microbiology,2008,77:235-239
[30]Marcos MS,Bertiller MB,Cisnerosb HS,et al.Nitrification and ammonia-oxidizing bacteria shift in response to soil moisture and plant litter quality in arid soils from the Patagonian Monte.Pedobiologia,2016,59:1-10
[31]Li Y(李源),Yuan X(袁星),Zhu H(祝惠).Simulation study on effects of soil moisture contents on nitrogen transformation and enzyme activities in black soil.Chinese Journal of Soil Science(土壤通报),2014,45(4):903-908(in Chinese)
[32]Jiang H,Wang J,Song L,et al.GC×GC-TOFMS analysis of essential oils composition from leaves,twigs and seeds of Cinnamomum camphora L.Presl and their insecticidal and repellent activities.Molecules,2016,21:423
[2]Cole DW,Rapp M.Elemental cycling in forest ecosystems//Reichle DE,ed.Dynamic Properties of Forest Ecosystems.Cambridge:Cambridge University Press,1981:341-409
[3]Chen J-L(陈金玲),Jin G-Z(金光泽),Zhao F-X(赵凤霞).Litter decomposition and nutrient dynamics at different succession stages of typical mixed broadleaved-Korean pine forest in Xiaoxing’an Mountains,China.Chinese Journal of Applied Ecology(应用生态学报),2010,21(9):2209-2216(in Chinese)
[4]Ramirez KS,Lauber CL,Fierer N.Microbial consumption and production of volatile organic compounds at the soil-litter interface.Biogeochemistry,2010,99:97-107
[5]Aerts R,Chapin FS.The mineral nutrition of wild plants revisited:A re-evaluation of processes and patterns.Advances in Ecolological Research,2000,30:1-67
[6]Httenschwiler S,Vitousek PM.The role of polyphenols in terrestrial ecosystem nutrient cycling.Trends in Ecology&Evolution,2000,15:238
[7]Smolander A,Ketola RA,Kotiaho T,et al.Volatile monoterpenes in soil atmosphere under birch and conifers:Effects on soil N transformations.Soil Biology&Biochemistry,2006,38:3436-3442
[8]Dinakaran J,Krishnayya NSR.Variations in soil organic carbon and litter decomposition across different tropical vegetal covers.Current Science,2010,99:1051-1060
[9]Dolores A,Jorge CY,Stefania M,et al.Litter VOCs induce changes in soil microbial biomass C and N and largely increase soil CO2efflux.Plant and Soil,2012,360:163-174
[10]Paavolainen L,Kitunen V,Smolander A.Inhibition of nitrification in forest soil by monoterpenes.Plant and Soil,1998,205:147-154
[11]Palviainen M,Finér L,Kurka AM,et al.Release of potassium,calcium,iron and aluminium from Norway spruce,scots pine and silver birch logging residues.Plant and Soil,2004,259:123-136
[12]Hobbie EA,Johnson MG,Rygiewicz PT,et al.Isotopic estimates of new carbon inputs into litter and soils in a four-year climate change experiment with Douglas-fir.Plant and Soil,2004,259:331-343
[13]Owen SM,Clark S,Pompe M,et al.Biogenic volatile organic compounds as potential carbon sources for microbial communities in soil from the rhizosphere of Populus tremula.FEMS Microbiology Letters,2007,268:34-39
[14]Andrianjafinandrasana SN,Andrianoelisoa HS,Jeanson ML,et al.Allelopathic effects of volatile compounds of essential oil from Ravensara aromatica sonnerat chemotypes.Allelopathy Journal,2013,31:333-344
[15]Wu J-G(吴建国).Effect of Land Use Change on Soil Organic Carbon.Beijing:China Forestry Publishing House,2004(in Chinese)
[16]Wang R,Wu T,Dai WH,et al.Effects of straw return on C2-C5non-methane hydrocarbon(NMHC)emissions from agricultural soils.Atmospheric Environment,2015,100:210-217
[17]Minstry of Ecology and Environment of People’s Republic of China(中国生态环境部).Soil-Determination of Ammonium,Nitrite and Nitrate by Extraction with Potassium Chloride Solution:Spectrophotometric Methods(HJ 634-2012).Beijing:China Enviromental Science Press,2012(in Chinese)
[18]White CS.Monoterpenes:Their effects on ecosystem nutrient cycling.Journal of Chemical Ecology,1994,20:1381-1406
[19]Dolores A,Susanm O,Joan L,et al.The distribution of volatile isoprenoids in the soil horizons around Pinus halepensis trees.Soil Biology&Biochemistry,2008,40:2937-2947
[20]Ghirardo A,Koch K,Taipale R,et al.Determination of de novo and pool emissions of terpenes from four common boreal/alpine trees by13CO2labelling and PTR-MSanalysis.Plant,Cell and Environment,2010,33:781-792
[21]Braddock RJ.Handbook of Citrus By-products and Processing Technology.New York:John Wiley&Sons,1999
[22]Insam H,Seewald MSA.Volatile organic compounds(VOCs)in soils.Biology and Fertility of Soils,2010,46:199-213
[23]Schade G,Custer T.OVOC emissions from agricultural soil in northern Germany during the 2003 European heat wave.Atmospheric Environment,2004,38:6105-6114
[24]Gong B(龚斌),Wang F-Y(王风玉),Zhang J-P(张继平),et al.Diurnal changes of soil respiration of mid-subtropical forest and its relationship with soil temperature and humidity.Ecology and Environmental Sciences(生态环境学报),2013,22(8):1275-1281(in Chinese)
[25]Lyu H-B(吕海波),Liang Z-S(梁宗锁).Effect of different soil water contents on soil respiratory intensity of Robinia pseudoacacia forest in loess area.Bulletin of Soil and Water Conservation(水土保持通报),2013,33(1):44-48(in Chinese)
[26]Park JH,Kalbitz K,Matzner E.Resource control on the production of dissolved organic carbon and nitrogen in a deciduous forest floor.Soil Biology&Biochemistry,2002,34:813-822
[27]Cai D(蔡丹),Yang X-H(杨秀虹),Lei Q-S(雷秋霜),et al.Field decomposition and dissolved organic matter release dynamics in leaf litter of typical trees in South China.Chinese Journal of Applied Ecology(应用生态学报),2016,27(9):2823-2830(in Chinese)
[28]He H,Song QM,Wang YF,et al.Phytotoxic effects of volatile organic compounds in soil water taken from a Eucalyptus urophylla plantation.Plant and Soil,2014,377:203-215
[29]Sidorenko ML,Buzoleva LS.Character of interactions of saprophytic soil microflora via gaseous metabolites.Microbiology,2008,77:235-239
[30]Marcos MS,Bertiller MB,Cisnerosb HS,et al.Nitrification and ammonia-oxidizing bacteria shift in response to soil moisture and plant litter quality in arid soils from the Patagonian Monte.Pedobiologia,2016,59:1-10
[31]Li Y(李源),Yuan X(袁星),Zhu H(祝惠).Simulation study on effects of soil moisture contents on nitrogen transformation and enzyme activities in black soil.Chinese Journal of Soil Science(土壤通报),2014,45(4):903-908(in Chinese)
[32]Jiang H,Wang J,Song L,et al.GC×GC-TOFMS analysis of essential oils composition from leaves,twigs and seeds of Cinnamomum camphora L.Presl and their insecticidal and repellent activities.Molecules,2016,21:423