Soil extractable carbon and nitrogen, microbial biomass and microbial metabolic activity in response to warming and increased precipitation in a semiarid Inner Mongolian grassland

Zhou, Xiaoqi; Chen, Chengrong; Wang, Yanfen; Xu, Zhihong; Duan, Jianan; Hao, Yanbin; Smaill, Simeon J.

doi:10.1016/j.geoderma.2013.04.020

Cited by 83 publications

(27 citation statements)

References 36 publications

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“…101,No. Although at the local scale and under certain conditions warming can increase (e.g., Li et al 2011, Sistla et al 2013 or decrease (e.g., Fu et al 2012, Weedon et al 2012, Jing et al 2014 microbial biomass N, in most cases it does not have any effect (e.g., Jonasson et al 1999, Biasi et al 2008, Zhou et al 2013. Although at the local scale and under certain conditions warming can increase (e.g., Li et al 2011, Sistla et al 2013 or decrease (e.g., Fu et al 2012, Weedon et al 2012, Jing et al 2014 microbial biomass N, in most cases it does not have any effect (e.g., Jonasson et al 1999, Biasi et al 2008, Zhou et al 2013.…”

Section: Microbial Biomass N Unaffected By Experimental Warming Acrosmentioning

confidence: 99%

Faster nitrogen cycling and more fungal and root biomass in cold ecosystems under experimental warming: a meta‐analysis

Salazar

Rousk

Jónsdóttir

et al. 2019

Ecology

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esson. 2020. Faster nitrogen cycling and more fungal and root biomass in cold ecosystems under experimental warming: a meta-analysis. Ecology 101(2):Abstract. Warming can alter the biogeochemistry and ecology of soils. These alterations can be particularly large in high northern latitude ecosystems, which are experiencing the most intense warming globally. In this meta-analysis, we investigated global trends in how experimental warming is altering the biogeochemistry of the most common limiting nutrient for biological processes in cold ecosystems of high northern latitudes (>50°): nitrogen (N). For comparison, we also analyzed cold ecosystems at intermediate and high southern latitudes. In addition, we examined N-relevant genes and enzymes, and the abundance of belowground organisms. Together, our findings suggest that warming in cold ecosystems increases N mineralization rates and N 2 O emissions and does not affect N fixation, at least not in a consistent way across biomes and conditions. Changes in belowground N fluxes caused by warming lead to an accumulation of N in the forms of dissolved organic and root N. These changes seem to be more closely linked to increases in enzyme activity that target relatively labile N sources, than to changes in the abundance of N-relevant genes (e.g., amoA and nosZ). Finally, our analysis suggests that warming in cold ecosystems leads to an increase in plant roots, fungi, and (likely in an indirect way) fungivores, and does not affect the abundance of archaea, bacteria, or bacterivores. In summary, our findings highlight global trends in the ways warming is altering the biogeochemistry and ecology of soils in cold ecosystems, and provide information that can be valuable for prediction of changes and for management of such ecosystems.

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Section: Microbial Biomass N Unaffected By Experimental Warming Acrosmentioning

confidence: 99%

Faster nitrogen cycling and more fungal and root biomass in cold ecosystems under experimental warming: a meta‐analysis

Salazar

Rousk

Jónsdóttir

et al. 2019

Ecology

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“…These studies show that water pulses can stimulate biological transformations of N, including microbial N uptake, gross N mineralization, ammonification, and nitrification (e.g., Schaeffer & Evans, 2005;Yahdjian & Sala, 2010;Dijkstra et al, 2012;Zhou et al, 2013), though one Arctic study showed a decrease in microbial and total organic N (Schaeffer et al, 2013). Pulse size influences N process responses but results are idiosyncratic.…”

Section: Nitrogen Pools and Fluxesmentioning

confidence: 99%

Impacts of altered precipitation regimes on soil communities and biogeochemistry in arid and semi‐arid ecosystems

Nielsen

Ball

2014

Global Change Biology

404

218

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Altered precipitation patterns resulting from climate change will have particularly significant consequences in water-limited ecosystems, such as arid to semi-arid ecosystems, where discontinuous inputs of water control biological processes. Given that these ecosystems cover more than a third of Earth's terrestrial surface, it is important to understand how they respond to such alterations. Altered water availability may impact both aboveground and belowground communities and the interactions between these, with potential impacts on ecosystem functioning; however, most studies to date have focused exclusively on vegetation responses to altered precipitation regimes. To synthesize our understanding of potential climate change impacts on dryland ecosystems, we present here a review of current literature that reports the effects of precipitation events and altered precipitation regimes on belowground biota and biogeochemical cycling. Increased precipitation generally increases microbial biomass and fungal:bacterial ratio. Few studies report responses to reduced precipitation but the effects likely counter those of increased precipitation. Altered precipitation regimes have also been found to alter microbial community composition but broader generalizations are difficult to make. Changes in event size and frequency influences invertebrate activity and density with cascading impacts on the soil food web, which will likely impact carbon and nutrient pools. The long-term implications for biogeochemical cycling are inconclusive but several studies suggest that increased aridity may cause decoupling of carbon and nutrient cycling. We propose a new conceptual framework that incorporates hierarchical biotic responses to individual precipitation events more explicitly, including moderation of microbial activity and biomass by invertebrate grazing, and use this framework to make some predictions on impacts of altered precipitation regimes in terms of event size and frequency as well as mean annual precipitation. While our understanding of dryland ecosystems is improving, there is still a great need for longer term in situ manipulations of precipitation regime to test our model.

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“…Under decreased precipitation, increased soil microbial biomass mortality is expected, as is as dying plant roots due to drought, which releases labile N into the soil and contributes to the accumulation of inorganic N [9,44,58]. The understory root biomass decreased in response to the DRY treatment, and may have released some N. In arid and semiarid regions, microbial mortality during dry seasons may account for 40% or more of the gross inorganic N produced during subsequent wet seasons [18].…”

Section: Insights Relevant For Management and Further Studymentioning

confidence: 99%

Experimental Manipulation of Precipitation Affects Soil Nitrogen Availability in Semiarid Mongolian Pine (Pinus sylvestris var. mongolica) Plantation

Fan

et al. 2017

Water

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Expected changes in precipitation over large regions of the world under global climate change will have profound effects on terrestrial ecosystems in arid and semiarid regions. To explore how changes in the amount of precipitation in the growing season would affect soil nitrogen (N) availability in a semiarid ecosystem, we established rainout shelters and irrigation systems by simulating 30% reduced (DRY) and 30% increased precipitation (WET) relative to natural precipitation (Control) to measure some key soil process properties for two growing seasons in a nutrient-poor Mongolian pine (P. sylvestris var. mongolica) plantation. Both WET and DRY treatments significantly affected monthly soil inorganic nitrogen concentrations, which showed a higher inorganic N under DRY than Control in each month and lower in WET than Control. Monthly soil microbial biomass N content was reduced by DRY and raised by WET treatments. The results indicated the asynchrony of the availability of soil moisture and soil nutrients in Mongolian pine plantations at the Horqin Sandy Lands in Northeast China. Water limited plant growth in Mongolian pine plantations when precipitation decreased, and nitrogen limitation became increasingly important when precipitation increased. Accumulation of N in microbial biomass is an important mechanism for N cycling in this ecosystem. To effectively manage Mongolian pine plantations, it is advised that evapotranspiration is minimized when precipitation decreases and that there is an increase in soil N availability by protecting litterfall when precipitation increases.

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Soil extractable carbon and nitrogen, microbial biomass and microbial metabolic activity in response to warming and increased precipitation in a semiarid Inner Mongolian grassland

Cited by 83 publications

References 36 publications

Faster nitrogen cycling and more fungal and root biomass in cold ecosystems under experimental warming: a meta‐analysis

Faster nitrogen cycling and more fungal and root biomass in cold ecosystems under experimental warming: a meta‐analysis

Impacts of altered precipitation regimes on soil communities and biogeochemistry in arid and semi‐arid ecosystems

Experimental Manipulation of Precipitation Affects Soil Nitrogen Availability in Semiarid Mongolian Pine (Pinus sylvestris var. mongolica) Plantation

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