Arid
DOI10.2307/1940888
PLANT-PRODUCTION AND SOIL-MICROORGANISMS IN LATE-SUCCESSIONAL ECOSYSTEMS - A CONTINENTAL-SCALE STUDY
ZAK, DR; TILMAN, D; PARMENTER, RR; RICE, CW; FISHER, FM; VOSE, J; MILCHUNAS, D; MARTIN, CW
通讯作者ZAK, DR
来源期刊ECOLOGY
ISSN0012-9658
出版年1994
卷号75期号:8页码:2333-2347
英文摘要

Annual C inputs from plant production in terrestrial ecosystems only meet the maintenance energy requirements of soil microorganisms, allowing for little or no net annual increase in their biomass. Because microbial growth within soil is limited by C availability, we reasoned that plant production should, in part, control the biomass of soil microorganisms. We also reasoned that soil texture should further modify the influence of plant production on soil C availability because fine-textured soils typically support more microbial biomass than coarse-textured soils. To test these ideas, we quantified the relationship between aboveground net primary production (ANPP) and soil microbial biomass in late-successional ecosystems distributed along a continent-wide gradient in North America. We also measured labile pools of C and N within the soil because they represent potential substrate for microbial activity. Ecosystems ranged from a Douglas-fir forest in the western United States to the grasslands of the mid-continent to the hardwood forests in the eastern U,S. Estimates of ANPP obtained from the literature ranged from 82 to 1460 g.m(-2).yr(-1).


Microbial biomass C and N were estimated by the fumigation-incubation technique. Labile soil pools of C and N and first-order rate constants for microbial respiration and net N mineralization were estimated using a long-term (32 wk) laboratory incubation. Regression analyses were used to relate ANPP and soil texture with microbial biomass and labile soil C and N pools. Microbial biomass carbon ranged from 2 g/m(2) in the desert grassland to 134 g/m(2) in the tallgrass prairie; microbial N displayed a similar trend among ecosystems. Labile C pools, derived from a first-order rate equation, ranged from 115 g/m2 in the desert grassland to 491 g/m2 in the southern hardwood forest. First-order rate constants for microbial respiration (k) fell within a narrow range of values (0.180 to 0.357 wk(-1)), suggesting that labile C pools were chemically similar among this diverse set of ecosystems. Potential net N mineralization rates over the 32-wk incubation were linear in most ecosystems with first-order responses only in the alpine tundra, tallgrass prairie, and forests. Microbial biomass C displayed a positive,linear relationship with ANPP (r(2) = 0.51), but was not significantly related to soil texture. Labile C also was linearly related to ANPP (r(2) = 0.32) and to soil texture (r(2) = 0.33), Results indicate that microbial biomass and labile organic matter pools change predictably across broad gradients of ANPP, supporting the idea that microbial growth in soil is constrained by C availability,


英文关键词ABOVEGROUND NET PRIMARY PRODUCTION CARBON AND NITROGEN CYCLES HETEROTROPHIC METABOLISM LABILE ORGANIC MATTER MICROBIAL RESPIRATION NET N MINERALIZATION SOIL MICROBIAL BIOMASS SOIL MICROORGANISMS SOIL TEXTURE SUBSTRATE-USE EFFICIENCY
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:A1994PW55400015
WOS关键词MICROBIAL BIOMASS CARBON ; ORGANIC-MATTER DYNAMICS ; NET PRIMARY PRODUCTION ; NITROGEN MINERALIZATION ; RESPIRATION ; MOISTURE ; FORESTS ; LITTER ; DECOMPOSITION ; NITRIFICATION
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
来源机构New Mexico State University ; Colorado State University ; E18
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/129941
作者单位(1)UNIV MINNESOTA,DEPT ECOL EVOLUT & BEHAV,ST PAUL,MN 55108;(2)UNIV NEW MEXICO,DEPT BIOL,ALBUQUERQUE,NM 87131;(3)KANSAS STATE UNIV AGR & APPL SCI,DEPT AGRON,MANHATTAN,KS 66506;(4)NEW MEXICO STATE UNIV,DEPT BIOL,LAS CRUCES,NM 88003;(5)US FOREST SERV,COWEETA HYDROL LAB,OTTO,NC 28763;(6)COLORADO STATE UNIV,DEPT RANGE SCI,FT COLLINS,CO 80523;(7)US FOREST SERV,HUBBARD BROOK EXPTL FOREST,CAMPTON,NH 03223
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ZAK, DR,TILMAN, D,PARMENTER, RR,et al. PLANT-PRODUCTION AND SOIL-MICROORGANISMS IN LATE-SUCCESSIONAL ECOSYSTEMS - A CONTINENTAL-SCALE STUDY[J]. New Mexico State University, Colorado State University, E18,1994,75(8):2333-2347.
APA ZAK, DR.,TILMAN, D.,PARMENTER, RR.,RICE, CW.,FISHER, FM.,...&MARTIN, CW.(1994).PLANT-PRODUCTION AND SOIL-MICROORGANISMS IN LATE-SUCCESSIONAL ECOSYSTEMS - A CONTINENTAL-SCALE STUDY.ECOLOGY,75(8),2333-2347.
MLA ZAK, DR,et al."PLANT-PRODUCTION AND SOIL-MICROORGANISMS IN LATE-SUCCESSIONAL ECOSYSTEMS - A CONTINENTAL-SCALE STUDY".ECOLOGY 75.8(1994):2333-2347.
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