Cross-site comparison of soil microbial biomass, soil nutrient status, and nematode trophic groups

Wright, Christina J.; Coleman, David C.

doi:10.1078/s0031-4056(04)70024-4

Cited by 46 publications

(20 citation statements)

References 51 publications

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“…Nevertheless, the low microbial biomass observed in TRH is in accordance with the results of previous macro-scale studies which concluded that the spatial pattern of soil microbial biomass at broad scales was driven by macro-climate and plant traits (Fierer et al, 2009;Insam, 1990;Serna-Chavez et al, 2013;Wardle, 1992;Wright and Coleman, 2000;Xu et al, 2013;Zak et al, 1994). The TRH region has extremely harsh climate with high temperature variability (Sang et al, 2013;van Gestel et al, 2011), Fig.…”

Section: Soil Microbial Biomass C and N In Trhsupporting

confidence: 80%

“…Wardle (1992) presented similar relationships between soil MBC and soil physical-chemical variables through compiling the microbial and environmental variables from published papers. Wright and Coleman (2000) and Fierer et al (2009) both showed that soil MBC was positively related to plant biomass, particularly for the belowground plant biomass. Serna-Chavez et al (2013) also illustrated that soil MBC was positively related to annual precipitation.…”

Section: Relationships Between Soil Mb and Edaphic Vegetational And mentioning

confidence: 99%

“…Many studies on soil MB have been conducted in the past few decades (Dempster et al, 2012;Kaschuk et al, 2010;Xu et al, 2013), and the focus has recently changed from site/ecosystem level Wright and Coleman, 2000;Zak et al, 1994) to regional (Dequiedt et al, 2011;Drenovsky et al, 2010) and global scales (Serna-Chavez et al, 2013;Xu et al, 2013). These large-scale studies examined microbial biomass storage and the mechanisms determining its spatial patterns.…”

Section: Introductionmentioning

confidence: 99%

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Spatial variability of soil microbial biomass and its relationships with edaphic, vegetational and climatic factors in the Three-River Headwaters region on Qinghai-Tibetan Plateau

Shen

et al. 2015

Applied Soil Ecology

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a b s t r a c tThis study aims to investigate the level of soil microbial biomass (MB) and analyze the relationships between soil MB and edaphic, vegetational and climatic factors at high elevation sites (>3000 m). We collected soil samples from 0 to 10 cm soil depth in 259 plots at 55 sites across 6 biomes in Three-River Headwaters (TRH) region at 3280-5127 m elevation. Soil microbial biomass carbon and nitrogen (MBC and MBN) were measured with the chloroform fumigation-extraction method. Multivariate stepwise regression analyses were used to analyze the combined effects of edaphic, vegetational and climatic factors on soil MB. We found: (1) soil MBC and MBN had an average of 30.95 mmol C/kg dry soil and 5.84 mmol N/kg dry soil in TRH, respectively, and their values were found to be negatively correlated with elevation; (2) soil MB was found to be significantly different among different biomes, and this spatial variation could be explained by the levels of soil organic carbon and belowground plant biomass. Our results indicate that the MB at high elevation region might be very low, and the increasing trend of soil microbial biomass with elevation could reverse at higher elevations.

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Section: Soil Microbial Biomass C and N In Trhsupporting

confidence: 80%

Section: Relationships Between Soil Mb and Edaphic Vegetational And mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spatial variability of soil microbial biomass and its relationships with edaphic, vegetational and climatic factors in the Three-River Headwaters region on Qinghai-Tibetan Plateau

Shen

et al. 2015

Applied Soil Ecology

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“…In contrast, the soil microbial biomass is characterized by an anatomically and physiologically diverse community of organisms that spans all the major life domains. Nonetheless, a long history of soil microbiological research does suggest that: (1) microbial biomass varies as a function of soil C content (Wardle 1992(Wardle , 1998; and (2) microbial biomass C:N ratios (on a mass basis) are relatively consistent, typically varying between 8:1 and 12:1 (Paul and Clark 1996;Wright and Coleman 2000). However, while the relationships between soil and microbial C and N content have been documented, data from terrestrial ecosystems also indicate that variations in organismal N:P ratios are more informative than C:N ratios for understanding many important terrestrial ecosystem processes (Reich and Oleksyn 2004;Townsend et al 2007).…”

Section: Introductionmentioning

confidence: 99%

C:N:P stoichiometry in soil: is there a “Redfield ratio” for the microbial biomass?

2007

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“…Nematodes have been quantified at HBEF along a riparian zone transect in W1. Nematode densities were converted to estimate biomass at about 0.15 g C/m 2 (Wright and Coleman 2000). Hence, compared to the 66 g C/m 2 estimated for microbial biomass (Bohlen et al 2001), these higher trophic levels make up a minute fraction of total C storage in organisms of the detrital food web.…”

Section: Heterotrophic Fluxesmentioning

confidence: 99%

The Biogeochemistry of Carbon at Hubbard Brook

et al. 2005

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Abstract. The biogeochemical behavior of carbon in the forested watersheds of the Hubbard Brook Experimental Forest (HBEF) was analyzed in long-term studies. The largest pools of C in the reference watershed (W6) reside in mineral soil organic matter (43% of total ecosystem C) and living biomass (40.5%), with the remainder in surface detritus (14.5%). Repeated sampling indicated that none of these pools was changing significantly in the late-1990s, although high spatial variability precluded the detection of small changes in the soil organic matter pools, which are large; hence, net ecosystem productivity (NEP) in this 2nd growth forest was near zero (± about 20 g C/m 2 -yr) and probably similar in magnitude to fluvial export of organic C. Aboveground net primary productivity (ANPP) of the forest declined by 24% between the late-1950s (462 g C/m 2 -yr) and the late-1990s (354 g C/m 2 -yr), illustrating age-related decline in forest NPP, effects of multiple stresses and unusual tree mortality, or both. Application of the simulation model PnET-II predicted 14% higher ANPP than was observed for 1996-1997, probably reflecting some unknown stresses. Fine litterfall flux (171 g C/m 2 -yr) has not changed much since the late-1960s. Because of high annual variation, C flux in woody litterfall (including tree mortality) was not tightly constrained but averaged about 90 g C/m 2 -yr. Carbon flux to soil organic matter in root turnover (128 g C/m 2 -yr) was only about half as large as aboveground detritus. Balancing the soil C budget requires that large amounts of C (80 g C/m 2 -yr) were transported from roots to rhizosphere carbon flux. Total soil respiration (TSR) ranged from 540 to 800 g C/m 2 -yr across eight stands and decreased with increasing elevation within the northern hardwood forest near W6. The watershedwide TSR was estimated as 660 g C/m 2 -yr. Empirical measurements indicated that 58% of TSR occurred in the surface organic horizons and that root respiration comprised about 40% of TSR, most of the rest being microbial. Carbon flux directly associated with other heterotrophs in the HBEF was minor; for example, we estimated respiration of soil microarthropods, rodents, birds and moose at about 3, 5, 1 and 0.8 g C/m 2 -yr, respectively, or in total less than 2% of NPP. Hence, the effects of other heterotrophs on C flux were primarily indirect, with the exception of occasional 2 -yr) were small, larger quantities of C were transported within the ecosystem and a more substantial fraction of dissolved C was transported from the soil as inorganic C and evaded from the stream as CO 2 (4.0 g C/m 2 -yr). Carbon pools and fluxes change rapidly in response to catastrophic disturbances such as forest harvest or major windthrow events. These changes are dominated by living vegetation and dead wood pools, including roots. If biomass removal does not accompany large-scale disturbance, the ecosystem is a large net source of C to the atmosphere (500-1200 g C/m 2 -yr) for about a decade following disturbance and becomes a net si...

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Cross-site comparison of soil microbial biomass, soil nutrient status, and nematode trophic groups

Cited by 46 publications

References 51 publications

Spatial variability of soil microbial biomass and its relationships with edaphic, vegetational and climatic factors in the Three-River Headwaters region on Qinghai-Tibetan Plateau

Spatial variability of soil microbial biomass and its relationships with edaphic, vegetational and climatic factors in the Three-River Headwaters region on Qinghai-Tibetan Plateau

C:N:P stoichiometry in soil: is there a “Redfield ratio” for the microbial biomass?

The Biogeochemistry of Carbon at Hubbard Brook

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