Shrubs magnify soil phosphorus depletion in Tibetan meadows: Conclusions from C:N:P stoichiometry and deep soil profiles

Gao, Xuebang; Li, Yong; Zhao, Ling; Kuzyakov, Yakov

doi:10.1016/j.scitotenv.2021.147320

Cited by 22 publications

(19 citation statements)

References 76 publications

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“…A network module is a collection of microbial members that conduct highly linked functions ( Deng and Zhou, 2015 ), and our results indicated a functional shift from a more P cycle-centered network to more nitrogen cycle-centered network. This was consistent with previous discussion that shrubs dominate under higher P content conditions, where the corresponding microbial community helps to turn over litter organic P into available soil phosphate ( Yong et al, 2018 ; Gao et al, 2019 , 2021 ), while grasses dominate under higher nitrogen conditions, where the corresponding microbial community accelerates nitrogen cycling and plant nitrogen assimilation ( Galloway et al, 2004 ). Plant and soil microbial communities have been reported to select each other and mutually create a functional system that favors both sides ( Veen et al, 2015 ).…”

Section: Discussionsupporting

confidence: 92%

“…In nature terrestrial ecosystem, P originates from slow weathering of parental material and atmosphere ash deposition, cycles in different nutrient pools, and relocates in soil profiles ( Walker and Syers, 1976 ; Canfield et al, 2005 ). To meet the higher P demand, shrubs uptake deep soil layer P into biomass via the root and release P as litters, which lead P accumulate in topsoil ( Yong et al, 2018 ; Gao et al, 2021 ). Then, rain water moves the topsoil P downward into deeper active root area, and the P can be absorbed by shrub again ( Walker and Syers, 1976 ; Canfield et al, 2005 ).…”

Section: Introductionmentioning

confidence: 99%

“…The vegetation expansion between shrub and grass is always accompanied by the change in phosphorus (P) and the chemical stoichiometry ( Yong et al, 2018 ; Gao et al, 2021 ), as shrub commonly had higher P content in biomass and higher P demand than grass ( Yang et al, 2016 ; Carrillo et al, 2017 ). In nature terrestrial ecosystem, P originates from slow weathering of parental material and atmosphere ash deposition, cycles in different nutrient pools, and relocates in soil profiles ( Walker and Syers, 1976 ; Canfield et al, 2005 ).…”

Section: Introductionmentioning

confidence: 99%

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Phosphorus Shapes Soil Microbial Community Composition and Network Properties During Grassland Expansion Into Shrubs in Tibetan Dry Valleys

Zhou

et al. 2022

Front. Plant Sci.

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Alpine ecosystem stability and biodiversity of the Tibetan plateau are facing threat from dry valley vegetation uplift expansion, a process which is highly connected to variations in the soil microbial community and soil nutrients. However, the variation of microbial community properties and their relationship to soil nutrients have scarcely been explored in Tibetan dry valleys, which is a gap that hampers understanding the dry valley ecosystem’s response to vegetation change. In this study, we sampled grasslands (G), a grass-shrub transition area (T), and shrublands (S) along an uplift expansion gradient and investigated the link between microbial community properties and soil nutrients. The results showed that shrub degradation by grass expansion in Tibetan dry valley was accompanied by increasing relative phosphorus (P) limitation, which was the main driver for bacterial and fungal composition variation as it offered highest total effect on PC1 (0.38 and 0.63, respectively). Total phosphorus (TP) was in the center module of bacterial and fungal network under shrub soil and even acted as key nodes in fungal networks. During the replacement by grass, TP was gradually marginalized from both bacterial and fungal center network module and finally disappeared in networks, with ammonia and nitrate gradually appearing in the bacterial network. However, TC and total nitrogen (TN) were always present in the center modules of both fungal and bacterial network. These support that a TP variation-induced compositional and network functional shift in the microbial community was a potential reason for vegetation uplift expansion in Tibetan dry valley. This study highlighted the effect of TP on microbial community properties during dry valley vegetation uplift expansion and offered basic information on Tibetan alpine dry valley ecosystem’s response to climate change.

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phosphorus Shapes Soil Microbial Community Composition and Network Properties During Grassland Expansion Into Shrubs in Tibetan Dry Valleys

Zhou

et al. 2022

Front. Plant Sci.

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“…Grasslands had the lowest TP content, as discovered by Li et al, 2016, [34]. Basin shrublands often grow on grasslands, and shrublands mobilize more soil P than grasslands, increasing phosphorus depletion in the root profile and gaining more P from the soil, aggravating soil P depletion in grasslands [40]. Soil pH was lower and phosphatase activity was higher under grassland and secreted more acidic compounds and directly or indirectly (e.g., through feeding microbes) produced more phosphatase enzyme in the rhizo-sphere [40].…”

Section: Effect Of Land-use Type On Soil Nutrientsmentioning

confidence: 86%

“…Basin shrublands often grow on grasslands, and shrublands mobilize more soil P than grasslands, increasing phosphorus depletion in the root profile and gaining more P from the soil, aggravating soil P depletion in grasslands [40]. Soil pH was lower and phosphatase activity was higher under grassland and secreted more acidic compounds and directly or indirectly (e.g., through feeding microbes) produced more phosphatase enzyme in the rhizo-sphere [40]. These mechanisms helped grassland plants acquire P from complex inorganic and organic P-containing compounds at the interface between the roots and soil [40].The AP content of grassland was higher than that of shrubland, implying that grassland had a higher P-use efficiency than shrubland because the phosphorus efficient-use strategy ensured that plants maintained photosynthesis and growth under low-phosphorus conditions [41].…”

Section: Effect Of Land-use Type On Soil Nutrientsmentioning

confidence: 99%

Characteristics of Soil Nutrients and Their Ecological Stoichiometry in Different Land Use Types in the Nianchu River Basin

Liu

Lü

et al. 2022

Land

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Land use types can cause changes in soil chemical characteristics, such as altering soil C, N, and P contents and distribution. The aim of this study was to investigate the status of soil C, N, P and other nutrient contents and their stoichiometric ratios in the terrestrial ecosystem of Nianchu River Basin, Tibet. A total of 102 sample plots with 306 soil samples and 102 plant samples were investigated in August 2021 along the Nianchu River basin by selecting four land-use types: grassland, shrubland, forestland, and farmland. The soil’s basic physical and chemical properties (soil organic matter (SOM), total nitrogen (TN), total phosphorus (TP), alkaline nitrogen (AN), available phosphorus (AP), pH, and soil particle composition) were examined at each sampling point, and the stoichiometric characteristics of C, N, and P of the soils were analyzed using one-way analysis of variance (ANOVAs). The results revealed that the C and N contents of shrubland were significantly lower than those of grassland, forestland, and farmland, with farmland having the highest P content. For all land types, C:N increased with increasing soil depth, while C:P and N:P decreased with increasing soil depth. PCA and RDA analyses revealed that soil texture and pH had an impact on soil C, N, and P contents, as well as stoichiometric ratios.

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The distribution, effectiveness and environmental threshold of soil aggregate phosphorus fractions in the sub‐alpine region of Southwest China

et al. 2022

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This article is a study of total phosphorus (TP), available phosphorus (AP) and phosphorus (P) fractions of soil aggregates along an altitude gradient in the sub-alpine region of Southwest China. We conclude that soil aggregate TP and AP contents are higher at 3980 m and 3347 m; there are no significant differences in soil aggregate TP at any altitude (p > 0.05); the AP and phosphorus activation coefficient (PAC) are higher in 0.25-0.5 mm aggregate. Soil aggregates TPi > TPo at 3009 m and TPo > TPi at 3347, 3654 and 3980 m. Using multiple stepwise regression analysis, we conclude that NaOH-Pi is the key fraction of AP supply, NaHCO 3 -Pi and NaOH-Pi are important fractions of CaCl 2 -P. Through piecewise linear fitting of soil aggregate AP and CaCl 2 -P, the soil P environmental threshold obtained is 27.766 mg kg À1 in this region. Also we got <0.25 mm, 0.25-0.5 mm aggregates at 3980 m which have high soil P loss risk. Our study fills in gap about the distribution of P fraction in aggregates and effects of soil P fraction for AP and CaCl 2 -P in high-altitude areas. Our study provides a reference and scientific basis for understanding the soil aggregate P storage capacity and the biological effectiveness of P fractions at high altitudes. Our study on the P environmental threshold provides a reference for soil P storage capacity. Our study provides a reference value for the soil P loss risk management, and sustainable development of soil ecosystems in the sub-alpine region of Southwest China.

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Shrubs magnify soil phosphorus depletion in Tibetan meadows: Conclusions from C:N:P stoichiometry and deep soil profiles

Cited by 22 publications

References 76 publications

Phosphorus Shapes Soil Microbial Community Composition and Network Properties During Grassland Expansion Into Shrubs in Tibetan Dry Valleys

Phosphorus Shapes Soil Microbial Community Composition and Network Properties During Grassland Expansion Into Shrubs in Tibetan Dry Valleys

Characteristics of Soil Nutrients and Their Ecological Stoichiometry in Different Land Use Types in the Nianchu River Basin

The distribution, effectiveness and environmental threshold of soil aggregate phosphorus fractions in the sub‐alpine region of Southwest China

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