Effects of Added Organic Matter and Water on Soil Carbon Sequestration in an Arid Region

Lai, Liming; Li, Yufei; Tian, Yuan; Jiang, Lianhe; Zhao, Xuechun; Zhu, Linhai; Chen, Xi; Gao, Yong; Wang, Shaoming; Rimmington, Glyn M.

doi:10.1371/journal.pone.0070224

Cited by 13 publications

(10 citation statements)

References 45 publications

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“…In contrast to the controls (F0P0), the soil C input–emission balanced was calculated (Table 4). In our prior study about the effects of treatments (FOM and water addition) on the soil organic C pool, it showed that the SOC in soil of F2 treatment plots were slightly higher than in soil of other treatment plots, but the differences were not significant [55]. In this study, the positive C input–emission balance was found in F2 treatment plots under the same water addition regime (Table 4).…”

Section: Discussionsupporting

confidence: 47%

Organic Matter and Water Addition Enhance Soil Respiration in an Arid Region

Lai¹,

Wang²,

Tian³

et al. 2013

PLoS ONE

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Climate change is generally predicted to increase net primary production, which could lead to additional C input to soil. In arid central Asia, precipitation has increased and is predicted to increase further. To assess the combined effects of these changes on soil CO2 efflux in arid land, a two factorial manipulation experiment in the shrubland of an arid region in northwest China was conducted. The experiment used a nested design with fresh organic matter and water as the two controlled parameters. It was found that both fresh organic matter and water enhanced soil respiration, and there was a synergistic effect of these two treatments on soil respiration increase. Water addition not only enhanced soil C emission, but also regulated soil C sequestration by fresh organic matter addition. The results indicated that the soil CO2 flux of the shrubland is likely to increase with climate change, and precipitation played a dominant role in regulating soil C balance in the shrubland of an arid region.

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Section: Discussionsupporting

confidence: 47%

Organic Matter and Water Addition Enhance Soil Respiration in an Arid Region

Lai¹,

Wang²,

Tian³

et al. 2013

PLoS ONE

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“…Of the eleven papers that investigated microbial biomass the majority found that microbial biomass increased in response to increased precipitation (e.g., Illeris et al, 2003;Liu et al, 2009;Zhang et al, 2013;Bell et al, 2014), while three studies found no response (Bi et al, 2012;Lai et al, 2013;Cregger et al, 2014) and two found variable context-dependent results (Cregger et al, 2012;Sherman et al, 2012). Only three of these papers reported responses to reduced precipitation but the results were idiosyncratic (Cregger et al, 2012(Cregger et al, , 2014Sherman et al, 2012).…”

Section: Biotic Responses To In Situ Precipitation Manipulationsmentioning

confidence: 99%

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

Nielsen

Ball

2014

Global Change Biology

437

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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“…4a). SWC has been regarded as the most important driving factor that controlled soil carbon cycle in the grassland (Lai et al, 2013;Wiesmeier et al, 2013). Many soil processes are affected by SWC and soil water movement, including microbial activity, leaching of minerals and biochemistry cycles (Manzoni et al, 2012).…”

Section: Carbon-water Couplingmentioning

confidence: 99%

“…Additionally, with soil drying out, the ratio of microbial and enzymatic activity decreased , and rest grazing increased the microbial carbon and promoted enrichment of the labile soil carbon pool by enhancing SWC (Shrestha and Stahl, 2008). Secondly, organic matter input to the soil were supplied by root, which was significantly affected by SWC in the natural environment (Jones, 2000;Lai et al, 2013). In addition, the productivity could be improved by the higher availability of plant water in RGG (Su et al, 2005) and as shown here (Figs.…”

Section: Carbon-water Couplingmentioning

confidence: 99%