Resource Availability Drives Responses of Soil Microbial Communities to Short-term Precipitation and Nitrogen Addition in a Desert Shrubland

She, Weiwei; Bai, Yuxuan; Zhang, Yuqing; Qin, Shugao; Feng, Wei; Sun, Yanfei; Zheng, Jufeng; Wu, Bin

doi:10.3389/fmicb.2018.00186

Cited by 97 publications

(88 citation statements)

References 92 publications

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“…Forward selection revealed that the two kingdoms responded to different sets of soil physicochemical parameters, namely, bacterial community composition was affected by Ca and Mg, while fungal community composition was affected by Ca, Na, and K. These predictors are notably different from variables commonly accepted as important for microbial community composition, such as organic matter (46,47), pH (48,49), and N. The failure of organic matter and N to predict microbial community structure is surprising at first glance, given that scarce C and N availability can limit rates of microbial growth and functions such as mineralization and that the abundance of N-cycling microbial taxa often varies with C and inorganic N species. However, this result is consistent with multiple studies showing no effect of N on microbial community composition (50)(51)(52). Agricultural management might outweigh the effects of variation in these parameters since Ca and Mg were not affected by management.…”

Section: Discussionsupporting

confidence: 91%

Effects of Agricultural Management on Rhizosphere Microbial Structure and Function in Processing Tomato Plants

Schmidt

Vannette

Igwe

et al. 2019

Appl Environ Microbiol

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Agricultural management practices affect bulk soil microbial communities and the functions they carry out, but it remains unclear how these effects extend to the rhizosphere in different agroecosystem contexts. Given close linkages between rhizosphere processes and plant nutrition and productivity, understanding how management practices impact this critical zone is of great importance to optimize plant-soil interactions for agricultural sustainability. A comparison of six paired conventional-organic processing tomato farms was conducted to investigate relationships between management, soil physicochemical parameters, and rhizosphere microbial community composition and functions. Organically managed fields were higher in soil total N and NO 3 -N, total and labile C, plant Ca, S, and Cu, and other essential nutrients, while soil pH was higher in conventionally managed fields. Differential abundance, indicator species, and random forest analyses of rhizosphere communities revealed compositional differences between organic and conventional systems and identified management-specific microbial taxa. Phylogeny-based trait prediction showed that these differences translated into more abundant pathogenesis-related gene functions in conventional systems. Structural equation modeling revealed a greater effect of soil biological communities than physicochemical parameters on plant outcomes. These results highlight the importance of rhizosphere-specific studies, as plant selection likely interacts with management in regulating microbial communities and functions that impact agricultural productivity. IMPORTANCE Agriculture relies, in part, on close linkages between plants and the microorganisms that live in association with plant roots. These rhizosphere bacteria and fungi are distinct from microbial communities found in the rest of the soil and are even more important to plant nutrient uptake and health. Evidence from field studies shows that agricultural management practices such as fertilization and tillage shape microbial communities in bulk soil, but little is known about how these practices affect the rhizosphere. We investigated how agricultural management affects plant-soil-microbe interactions by comparing soil physical and chemical properties, plant nutrients, and rhizosphere microbial communities from paired fields under organic and conventional management. Our results show that human management effects extend even to microorganisms living in close association with plant roots and highlight the importance of these bacteria and fungi to crop nutrition and productivity.

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Section: Discussionsupporting

confidence: 91%

Effects of Agricultural Management on Rhizosphere Microbial Structure and Function in Processing Tomato Plants

Schmidt

Vannette

Igwe

et al. 2019

Appl Environ Microbiol

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“…And the applied N significantly increased the inorganic N content in soil, which significantly effected on the bacterial and fungi communities ( Figure 5). Similar results were reported that the increase in N availability changed the microbial community (Fierer et al, 2007;She et al, 2018), and the soil nitrate N, SOC content, and organic C input environmental factors can be directly related to the mediated soilplant-microbe interaction (Zeng et al, 2016).…”

Section: Maintaining the Soil Microbial Community While Optimizing supporting

confidence: 85%

Long‐term optimization of crop yield while concurrently improving soil quality

Pan

Chen

et al. 2019

Land Degrad Dev

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Sustainably feeding the growing human population requires improvements in both soil quality and nitrogen (N) management. However, in response to N fertilizer addition, whether soil quality will be optimized at N application rates that maximize yields is rarely explored from a long‐term perspective. We conducted a 9‐year field experiment to examine agronomic and soil quality indices in a wheat (Triticum aestivum L.)/maize (Zea mays L.) double cropping system. Optimal nitrogen rates (ONR) were determined by in‐season soil NO3−‐N testing. Other treatments included control plots, 50–70% ONR, 130–150% ONR, and local farmers' N practices (FNP). The ONR increased grain yield by 10.5% in comparison with the 50–70% ONR treatment and achieved yields comparable to the 130–150% ONR treatment. The ONR treatment reduced the applied N fertilization rate by 38.5% in comparison with FNP levels but without any yield losses. After N fertilization for 9 years, soil organic carbon (SOC) stocks, C sequestration rates, and soil microbial biomass C were the highest with the ONR treatment. Relative to the control, the ONR treatment significantly increased the weight diameter of soil water‐stable aggregates, reduced the richness and diversity of fungi, and reduced the richness of bacteria in comparison with the FNP treatment. Furthermore, the soil microbial community structure had a significant relationship with the SOC, organic C input, and soil inorganic N content, which was ascribed to the driving of N management strategy. These results highlight the importance of the optimization of N management to produce high grain with less N fertilizer input in agricultural systems while concurrently promoting soil quality and providing benefits to the microbial community.

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“…The nonsignificant water effects in our study were attributed to the finding that soil N availability was not affected by water addition (Figure 1b). Because the desert soil in our study contained only a small amount of organic matter (soil organic carbon content, 2.88 ± 0.18 g/kg; She et al, 2018), it is likely that water addition could not be enough to mineralize more available N from organic matter and thus could not enhance soil N availability (Wang et al, 2006). Alternatively, the simultaneous water addition with high natural precipitation in the present study may have led to soil N loss through leaching and denitrification (Huang, Yu, Li, Yuan, & Bartels, 2009;Srivastava, Singh, Tripathi, Singh, & Raghubanshi, 2018), resulting in no change in soil inorganic N availability.…”

Section: Discussionmentioning

confidence: 99%

Nitrogen enrichment alters nutrient resorption and exacerbates phosphorus limitation in the desert shrub Artemisia ordosica

Zheng

She

Zhang

et al. 2018

Ecology and Evolution

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Increasing nitrogen (N) deposition and precipitation are major drivers of global changes that are expected to influence plant nutrient resorption in desert ecosystems, where plant growth is often nutrient and water limited. However, knowledge on the effects of increased N and precipitation on them remain poorly understood. This study determined the effects of increased N (ambient, 60 kg N ha−1 year−1) and water supply (ambient, +20%, +40%), and their combination on the leaf nutrient resorption of Artemisia ordosica, a dominant shrub in the Mu Us Desert of northern China. After 2 years of treatments, only N addition significantly decreased the N resorption efficiency of A. ordosica. Both N and water addition had no effect on the phosphorus (P) resorption efficiency of this shrub, and there were no interactive effects of N and water availability on shrub nutrient resorption. The responses of shrub leaf N:P ratio tended to saturate as soil available N:P increased. The aboveground net primary productivity of A. ordosica was positively correlated with leaf P resorption efficiency, rather than N resorption efficiency. Our results suggest that N addition exacerbated the P limitation of the shrub growth and played a more fundamental role than water addition in controlling the nutrient resorption process of the desert shrub A. ordosica. This information contributes to understand the relationship between nutrient conservation strategy and plant growth of desert shrub species under global environmental changes.

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Resource Availability Drives Responses of Soil Microbial Communities to Short-term Precipitation and Nitrogen Addition in a Desert Shrubland

Cited by 97 publications

References 92 publications

Effects of Agricultural Management on Rhizosphere Microbial Structure and Function in Processing Tomato Plants

Effects of Agricultural Management on Rhizosphere Microbial Structure and Function in Processing Tomato Plants

Long‐term optimization of crop yield while concurrently improving soil quality

Nitrogen enrichment alters nutrient resorption and exacerbates phosphorus limitation in the desert shrub Artemisia ordosica

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