Changes in soil C:N:P stoichiometry along an aridity gradient in drylands of northern China

Wang, Xiaoguang; Lü, Xiao‐Tao; Zhang, Haiyang; Dijkstra, Feike A.; Jiang, Yuwei; Wang, Xiaobo; Luo, Wentao; Wuyunna,; Wang, Zhengwen; Han, Xingguo

doi:10.1016/j.geoderma.2019.114087

Cited by 42 publications

(25 citation statements)

References 35 publications

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“…The ratio of total soil carbon to nitrogen is an important indicator to evaluate the composition and quality of soil organic matter ( Fang et al, 2019 ). In this study, C/N increased significantly in the treatments of biochar addition alone and the mixed addition and was higher than the global average of grassland soil (11.8) ( Wang X. G. et al, 2020 ). It indicated that biochar addition makes soil carbon be supplemented.…”

Section: Discussionmentioning

confidence: 55%

The Mixed Addition of Biochar and Nitrogen Improves Soil Properties and Microbial Structure of Moderate–Severe Degraded Alpine Grassland in Qinghai-Tibet Plateau

Zhao

Shao

et al. 2021

Front. Plant Sci.

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The degradation of the grassland system has severely threatened the safety of the ecological environment and animal husbandry. The supplement of key substances lost due to degradation is widely used to accelerate the restoration of the degraded grassland ecosystem. In this study, we investigated the effects of biochar and nitrogen addition on soil properties and microorganisms of degraded alpine grassland. The experimental treatments consisted of the control without any addition, only nitrogen addition (10 gN/m2), only biochar addition (4.00 kg/m2 biochar), and the mixed addition of biochar and nitrogen (4.00 kg/m2 biochar and 10 gN/m2 nitrogen, respectively). Adding N alone did not significantly change the pH, total organic carbon (TOC), total nitrogen (TN), microbial biomass (MB), and the composition proportion of microbes of the soil, but increased the contents of soil water content (SWC), NH4+-N, NO3–-N, available phosphorus (AP), and the biomass of bacteria and fungi. The addition of biochar or the mixture of biochar and nitrogen increased the contents of pH, TOC, TN, MB, SWC, NH4+-N, NO3–-N, AP, bacteria, and fungi in the soil and changed the structure of the soil microbial community. The increasing intensity of AP, bacteria, and fungi under the addition of biochar or the mixture of biochar and nitrogen was significantly greater than that under N addition alone. These results indicated that the separated addition of nitrogen and biochar and the mixed addition of biochar and nitrogen all improved the soil condition of the moderate–severe degraded alpine grassland, but the mixed addition of biochar and nitrogen could be a better strategy to remediate the degraded alpine grassland.

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Section: Discussionmentioning

confidence: 55%

The Mixed Addition of Biochar and Nitrogen Improves Soil Properties and Microbial Structure of Moderate–Severe Degraded Alpine Grassland in Qinghai-Tibet Plateau

Zhao

Shao

et al. 2021

Front. Plant Sci.

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“…Total organic carbon (TOC) and total nitrogen (TN) were measured using an automatic elemental analyser (Vario MACRO cube, Elementar Analysensysteme GmbH). Total phosphorus (TP) in the soil was determined colorimetrically (800 nm) on a spectrophotometer (Carry500, Varian Company; Wang et al, 2020). Soil moisture (SM) content was determined after drying the soil at 105°C for 48 hr.…”

Section: Soil and Plant Samplingmentioning

confidence: 99%

Spatial patterns and ecological drivers of soil nematode β‐diversity in natural grasslands vary among vegetation types and trophic position

Xiong

Wei

Wang

et al. 2021

Journal of Animal Ecology

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1. Understanding biogeographic patterns of community assemblages is a core objective in ecology, but for soil communities these patterns are poorly understood. To understand the spatial patterns and underlying mechanisms of β-diversity in soil communities, we investigated the β-diversity of soil nematode communities along a 3,200-km transect across semi-arid and arid grasslands.2. Spatial turnover and nested-resultant are the two fundamental components of β-diversity, which have been attributed to various processes of community assembly. We calculated the spatial turnover and nested-resultant components of soil nematode β-diversity based on the β-partitioning framework. Distance matrices for the dissimilarity of soil nematode communities were computed using the 'Sørensen' method. We fitted negative exponential models to compare the distance decay patterns in nematode community similarity with geographic distance and plant community distance in three vegetation types (desert, desert steppe and typical steppe) and along the whole transect. Variation partitioning was used to distinguish the contribution of geographic distance and environmental variables to β-diversity and the partitioned components.3. Geographic distance and environmental filtering jointly drove the β-diversity patterns of nematode community, but environmental filtering explained more of the variation in β-diversity in the desert and typical steppe, whereas geographic distance was important in the desert steppe. Nematode community assembly was explained more by the spatial turnover component than by the nested-resultant component. For nematode feeding groups, the β-diversity in different vegetation types increased with geographic distance and plant community distance, but the nested-resultant component of bacterial feeders in the desert ecosystem decreased with geographic distance and plant community distance. 4. Our findings show that spatial variation in soil nematode communities is regulated by environmental processes at the vegetation type scale, while spatial processes

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“…Similar to climate factors, changes in soil pH can significantly affect soil N ( Nie et al, 2017 ), which in turn inevitably influences the soil N:P ratio. It has been demonstrated that soil pH was significant in shaping soil N:P ratios in the drylands of northern China ( Wang et al, 2020 ), and was even the most robust factor controlling soil N:P ratios in mature subtropical broadleaf forests ( Qiao et al, 2020 ), and grasslands in the Inner Mongolian Plateau ( Jiao et al, 2016 ). Although there is substantial variation in soil pH ( Yang et al, 2015 ), soil pH affects soil N:P ratios in the high-altitude areas of the Tibetan Plateau, and this effect has been largely unreported.…”

Section: Introductionmentioning

confidence: 99%

Distribution Characteristics and Controlling Factors of Soil Total Nitrogen: Phosphorus Ratio Across the Northeast Tibetan Plateau Shrublands

et al. 2022

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Nitrogen (N) and phosphorus (P) stoichiometry have significant effects on nutrient cycles in terrestrial ecosystems. However, our understanding of the patterns and the driving factors of soil N:P ratios in the Tibetan Plateau shrublands remains limited. Our study aimed to quantify the distribution of soil N:P ratio and its controlling factors based on soil, plant, and climate factors from 59 sites in shrublands across the northeast Tibetan Plateau. The kriging interpolation method was used to quantify the soil N:P distribution. Spatially, the soil N:P ratio was higher in the south than in the north and lower in the west than in the east. The soil N:P ratio in the northeast Tibetan Plateau shrublands was mainly explained by edaphic factors, which also played an important role in regulating the effects of plant and climate factors on soil N:P ratios. Mean annual precipitation, instead of mean annual temperature, significantly controlled the soil N:P ratios, and its effect on the pattern of soil N:P ratios differed between alpine shrublands and desert shrublands. The N:P ratios of different organs in shrublands also played different roles in shaping the soil N:P ratios in alpine and desert shrublands. These results provide support for the hypothesis that edaphic factors were the dominant drivers of spatial variation in soil N:P ratios across the northeast Tibetan Plateau shrublands, and our study contributes to a deeper understanding of biogeochemical cycling at high altitudes.

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Changes in soil C:N:P stoichiometry along an aridity gradient in drylands of northern China

Cited by 42 publications

References 35 publications

The Mixed Addition of Biochar and Nitrogen Improves Soil Properties and Microbial Structure of Moderate–Severe Degraded Alpine Grassland in Qinghai-Tibet Plateau

The Mixed Addition of Biochar and Nitrogen Improves Soil Properties and Microbial Structure of Moderate–Severe Degraded Alpine Grassland in Qinghai-Tibet Plateau

Spatial patterns and ecological drivers of soil nematode β‐diversity in natural grasslands vary among vegetation types and trophic position

Distribution Characteristics and Controlling Factors of Soil Total Nitrogen: Phosphorus Ratio Across the Northeast Tibetan Plateau Shrublands

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