降水改变对樟子松人工林土壤微生物量碳及微生物商动态变化的影响

() ()2008 4 3 ( a) ( b) ( c) Fig13 Relationships of soil microbial biomass carbon with soil bulk density (a) , soil water content (b) , and soil total organic carbon (c)3 30 %Table 3 Repeated measures of ANOVA for the effects of 30 % throughfall on soil microbial biomass carbon and microbial quotient F P F P 4 3. 269 0. 015 4 2. 762 0. 032 8 3. 567 0. 001 8 3. 356 0. 002 12 1. 375 0. 191 12 1. 431 0. 165 24 0. 960 0. 524 24 1. 100 0. 359 2 3. 032 0. 067 2 1. 763 0. 193 3 14. 594 0. 000 3 15. 003 0. 000 6 0. 153 0. 987 6 0. 067 0. 675+ (P < 0105)4 30 %( a) ( b) Fig14 Effects of 30 % throughfall on soil microbial biomass carbon (a) and microbial quotient (b),30 %2007 30 %, [14 ] ,,,Illeris [21 ] ,,30 %(3 (b) ) ,,,,© 1994-2009 China Academic Journal Electronic Publishing House. All rights reserved. http://www.cnki.net56

pkuxbw2008057: 30 %(P < 0105)5 30 %( a) ( b) Fig15 Effects of 30 % throughfall on dynamics of soil microbial biomass carbon (a) and microbial quotient (b), [22223 ],,30 %, [24225 ] 33 %(5 ) , [26 ] ,,,,,30 %1612 % ,,30 %,,30 %,Jensen [8 ] ( Erica carnea) ,Salamanca [27 ] 50 %30 %, [28 ],( P < 01001) (3 (c) ) ,30 %5 ,2007 5 ,3 (2(a) ) ,5 ,5 [29230 ], 30 %, [28 ] 30 %,,30 %,,30 %(4 (b) ) 2007 9 30 %30 % ,48 ,,9 ,30 %30 %213 ,2007 ,30 %30 %(5) ,2431135413 mgΠkg 1143 %57© 1994-2009 China Academic Journal Electronic Publishing House. All rights reserved. http://www.cnki.net

() ()2008 4 2116 % ,2201623710 mgΠkg1174 %1192 % ,30 %2491128219 mgΠkg1184 %2108 %,30 %5 ,7 ,8 ,9 (5) 30 % [31 ] [14 ] (3 (b) ) ,(2 ( a) , 5(a) ) Wardle [28 ] , 30 %,,30 %30 %(5) ,,, [32 ] ,3 26017 mgΠkg ,511064610 mgΠkg ;1184 % ,0178 %4112 % , Biochemistry , 1990 , 22 (8) : 116721169, [12 ] Vance E D , Brookes P C , Jenkinson D S. An extractionmethod for measuring soil microbial biomass C. Soil Biology30 %&Biochemistry , 1987 , 19 (6) : 703270730 %[13 ] Sparling G P , Feltham C W , Reynolds J , et al. Estimation30 %of soil microbial C by a fumigation2extraction method : Use,on soils of high organic matter content , and a reassessmentof the k ec 2factor. Soil Biology & Biochemistry , 1990 , 22 :[1 ] IPCC. WGI Fourth Assessment Report. Climate Change2007 : The physical science basis. Geneva : Intergover2nmental Panel on Climate Change , 2007[2 ] Liu B H , Xu M , Henderson M , et al. Observed trends ofprecipitation amount , frequency , and intensity in China ,196022000. Journal of Geophysical Research , 2005 , 110 ,D08103 , doi : 10. 1029Π2004JD004864[3 ] Weltzin J F , Loik M E , Schwinning S , et al. Assessing theresponse of terrestrial ecosystems to potential changes inprecipitation. BioScience , 2003 , 53 (10) : 9412952[4 ] Fay P A , Carlisle J D , Knapp A K, et al. Altering rainfalltiming and quantity in a mesic grassland ecosystem : Designand performance of rainfall manipulation shelters.Ecosystems , 2000 , 3 (3) : 3082319[5 ] Hanson P J , Wullschleger S D. North American temperatedeciduous forest responses to changing precipitation regimes.New York : Springer2Verlag , 2003 : 15[6 ] Harper C W , Blair J M , Fay P A , et al. Increased rainfallvariability and reduced rainfall amount decreases soil CO 2flux in a grassland ecosystem. Global Change Biology ,2005 , 11 (12) : 3222334[7 ] Knapp A K, Fay P A , Blair J M , et al. Rainfallvariability, carbon cycling and plant species diversity in amesic grassland. Science , 2002 , 298 : 220222205[8 ] Jensen K D , Beier C , Michelsen A , et al.© 1994-2009 China Academic Journal Electronic Publishing House. All rights reserved. http://www.cnki.net58Effects ofexperimental drought on microbial processes in twotemperate heathlands at contrasting water conditions.Applied Soil Ecology , 2003 , 24 (2) : 1652176[9 ] Wardle D A. Controls of temporal variability of the soilmicrobial biomass : A global2scale synthesis. Soil Biology &Biochemistry , 1998 , 30 (13) : 162721637[10 ] , , , . . , 2006 , 17 (12) : 229222296[11 ] Wu J , Joergensen R G, Pommerening B , et al.Measurement of soil microbial biomass C by fumigation2extraction An automated procedure. Soil Biology &3012307[14 ] Zhang Q S , Zak J C. Effects of water and nitrogenamendment on soil microbial biomass and fine rootproduction in a semi2arid environment in west Texas. SoilBiology &Biochemistry , 1998 , 30 (1) : 39245[15 ] Bastida F , Moreno J L , Hern Ndez T , et al. The long2term

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