Microbial biomass and production associated with decaying leaf litter of the emergent macrophyte Juncus effusus

被引:111
作者
Kuehn, KA [1 ]
Lemke, MJ [1 ]
Suberkropp, K [1 ]
Wetzel, RG [1 ]
机构
[1] Univ Alabama, Dept Biol Sci, Tuscaloosa, AL 35487 USA
关键词
D O I
10.4319/lo.2000.45.4.0862
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Emergent macrophytes are a major source of organic matter production in freshwater wetlands, and often represent the bulk of the plant material entering the detrital pool. We examined the decomposition and microbial dynamics associated with litter of the emergent macrophyte, Juncus effusus (soft rush), during its movement from an aerial standing dead to a submerged decay environment. Standing dead leaves of J. effusus were collected after an initial period of standing litter microbial decay, placed in 1-mm mesh litter bags, and submerged in a wetland. Litter bags were retrieved periodically over 268 d and analyzed for microbial (fungal and bacterial) biomass and production, ATP concentrations, litter mass loss, and quality (C:N:P and plant fiber). Submerged litter decay of J, effusus was slow (k = 0.0010 d(-1)), with only 23% weight loss after 268 d. Both fungal and bacterial biomass and production decreased significantly soon after standing plant litter was submerged in the wetland surface waters. Despite decreases in microbial biomass and production, fungal decomposers remained the dominant microbial assemblage associated with decaying plant litter, accounting for 99% and 91% of the total microbial biomass and production, respectively. Mean fungal production ranged from 73-2,836 mu g C g(-1) AFDM d(-1) (AFDM: ash-free dry mass remaining) during the study period, whereas attached bacterial production ranged from 4-32 mu g C g(-1) AEDM d(-1). patterns of litter ATP and nutrient concentrations (N and P) were similar to those observed for fungal and bacterial biomass, suggesting that at least a portion of the detrital N and P may have been incorporated into microbial biomass. Significant changes in microbial colonization and activity associated with emergent macrophyte litter can occur following the collapse of standing dead plant matter to the water or surface sediments. Furthermore, our findings suggest that fungi are significant contributors to the decay of coarse particulate plant matter in wetland ecosystems.
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页码:862 / 870
页数:9
相关论文
共 49 条
[31]   FACTORS FOR CONVERSION OF FUNGAL BIOVOLUME VALUES TO BIOMASS, CARBON AND NITROGEN - VARIATION WITH MYCELIAL AGES, GROWTH-CONDITIONS, AND STRAINS OF FUNGI FROM A SALT-MARSH [J].
NEWELL, SY ;
STATZELLTALLMAN, A .
OIKOS, 1982, 39 (02) :261-268
[33]   Misting and nitrogen fertilization of shoots of a saltmarsh grass: Effects upon fungal decay of leaf blades [J].
Newell, SY ;
Arsuffi, TL ;
Palm, LA .
OECOLOGIA, 1996, 108 (03) :495-502
[34]   DECOMPOSITION AND MICROBIAL DYNAMICS FOR STANDING, NATURALLY POSITIONED LEAVES OF THE SALT-MARSH GRASS SPARTINA-ALTERNIFLORA [J].
NEWELL, SY ;
FALLON, RD ;
MILLER, JD .
MARINE BIOLOGY, 1989, 101 (04) :471-481
[35]   THE USE OF DAPI FOR IDENTIFYING AND COUNTING AQUATIC MICROFLORA [J].
PORTER, KG ;
FEIG, YS .
LIMNOLOGY AND OCEANOGRAPHY, 1980, 25 (05) :943-948
[36]   MYCOFLORA ASSOCIATED WITH TYPHA-LATIFOLIA [J].
PUGH, GJF ;
MULDER, JL .
TRANSACTIONS OF THE BRITISH MYCOLOGICAL SOCIETY, 1971, 57 (OCT) :273-+
[37]   A COMPARISON OF METHODS FOR DETERMINING PROXIMATE CARBON FRACTIONS OF FOREST LITTER [J].
RYAN, MG ;
MELILLO, JM ;
RICCA, A .
CANADIAN JOURNAL OF FOREST RESEARCH, 1990, 20 (02) :166-171
[38]  
SINSABAUGH RL, 1995, MICROBIAL ECOL, V30, P127, DOI 10.1007/BF00172569
[39]   Application of fungal and bacterial production methodologies to decomposing leaves in streams [J].
Suberkropp, K ;
Weyers, H .
APPLIED AND ENVIRONMENTAL MICROBIOLOGY, 1996, 62 (05) :1610-1615
[40]   RELATIONSHIPS BETWEEN GROWTH AND SPORULATION OF AQUATIC HYPHOMYCETES ON DECOMPOSING LEAF LITTER [J].
SUBERKROPP, K .
MYCOLOGICAL RESEARCH, 1991, 95 :843-850