Patterns and driving mechanism of soil organic carbon, nitrogen, and phosphorus stoichiometry across northern China’s desert-grassland transition zone

Lu, Jiannan; Feng, Shuang; Wang, Shaokun; Zhang, Baolong; Ning, Zhiying; Wang, Ruixiong; Chen, Xueping; Yu, Lei; Zhao, Hongsheng; Lan, Dengming; Zhao, Xueyong

doi:10.1016/j.catena.2022.106695

Cited by 49 publications

(13 citation statements)

References 49 publications

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“…And the data analysis was performed according to the Origin 2021. The graphs of correlation analysis were performed using the "ggplot2" and "ggthemes" packages in R 4.2.2 and RDA employed CANOCO 5.0 to complete (Lu et al, 2023). p < .05 was considered statistically significant.…”

Section: Discussionmentioning

confidence: 99%

“…Histogram of microbial community compositions and percentage increase of fertilization to the maximum value of all PLFA groups were drawn with Origin 2021. The graphs of correlation analysis were performed using the “ggplot2” and “ggthemes” packages in R 4.2.2 and RDA employed CANOCO 5.0 to complete (Lu et al., 2023). p < .05 was considered statistically significant.…”

Section: Methodsmentioning

confidence: 99%

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Fertilization can accelerate the pace of soil microbial community response to rest‐grazing duration in the three‐river source region of China

Zhou,

Wang,

et al. 2023

Ecology and Evolution

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Overgrazing leads to grassland degradation and productivity decline. Rest‐grazing during the regreen‐up period can quickly restore grassland and fertilization is a common restoration strategy. However, the effects of rest‐grazing time and fertilization on soil microorganisms are unclear in the alpine grasslands. Therefore, the experiment of rest‐grazing time and fertilization was carried out to explore the response of soil microorganisms to rest‐grazing time and fertilization measures. A field control experiment with rest‐grazing time and fertilization as factors have been conducted from the time when grass returned to green till the livestock moved to the summer pasture in Dawu Town of Maqin County of China. The primary treatment we established was the five rest‐grazing time, including rest‐grazing time of 20 days, 30 days, 40 days, 50 days, and traditional grazing was used as a check group. At the same time, the secondary treatment was nitrogen addition of 300 kg·hm−2 in each primary treatment. The results showed that the total phospholipid fatty acid (total PLFA), actinomyces (Act), and arbuscular mycorrhizal fungi (AMF) showed an ever‐increasing biomass with the increase of rest‐grazing time and the highest was at 50 days of rest‐grazing, and they were all significantly higher than CK. In addition, soil microbial biomass carbon‐nitrogen ratio (MBC/MBN) had great influence on the change of microbial community. Applying nitrogen fertilizer can increase the maximum value of biomass of all PLFA groups and the biomass of all PLFA groups changed in an “inverted V” shape with the increase of rest‐grazing time. Besides, instead of MBC/MBN, NO3−‐N was positively correlated with the biomass of all PLFA groups, which actively regulated the trend of microbial functions. The longer rest‐grazing time is more conducive to the biomass of all PLFA groups. However, applying nitrogen fertilizer could break this pattern, namely, the 30 days rest‐grazing would be beneficial to the biomass of all PLFA groups. These findings provide key information that rest‐grazing during the regreen‐up period is benefiscial to the all PLFA groups and fertilization could change the response of microorganisms to rest‐grazing, which provide reference measures for the restoration of degraded alpine meadows.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Fertilization can accelerate the pace of soil microbial community response to rest‐grazing duration in the three‐river source region of China

Zhou,

Wang,

et al. 2023

Ecology and Evolution

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“…The mass fractions of clay, silt, and sand in the collected soil (25.48%, 57.38%, and 17.14%, respectively) were measured by using a laser particle size analyzer (2000E, Mastersizer, Britain), while the organic carbon content (9.56 g kg −1 ) was measured using the H 2 SO 4 −K 2 Cr 2 O 7 method proposed previously. 30 The cation exchange capacity of the soil (22.37 cmol kg 1− ) was measured by adding 0.2 M ammonium chloride to the soil supernatant for three consecutive washes to substitute exchangeable cations. 31 Preparation and Characterization of the Biochar.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…The tested soil was collected from the upper 0–20 cm of agricultural land in Yangling City, Shaanxi Province, China (E 108°07′, N 34°26′), dried at 25 °C, and then sifted through 2 mm. The mass fractions of clay, silt, and sand in the collected soil (25.48%, 57.38%, and 17.14%, respectively) were measured by using a laser particle size analyzer (2000E, Mastersizer, Britain), while the organic carbon content (9.56 g kg –1 ) was measured using the H 2 SO 4 –K 2 Cr 2 O 7 method proposed previously . The cation exchange capacity of the soil (22.37 cmol kg 1– ) was measured by adding 0.2 M ammonium chloride to the soil supernatant for three consecutive washes to substitute exchangeable cations …”

Section: Methodsmentioning

confidence: 99%

Biochar-Associated Free Radicals Reduce Soil Bacterial Diversity: New Insight into Ecoenzymatic Stoichiometry

Yang,

Chen,

Wang

et al. 2023

Environ. Sci. Technol.

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The toxicity of environmentally persistent free radicals (EPFRs), often generated during biochar production, on soil bacteria is still not truly reflected when considering the conditions in real soil. Herein, the influence of free radicals within biochar on soil bacteria was investigated from the perspectives of enzyme activity, community structure, and ecoenzymatic stoichiometry. Biochar addition enhanced the contents of EPFRs and derived hydroxyl radicals (•OH) in the soil, while it reduced bacterial alpha diversity by 5.06–35.44%. The results of redundancy analysis and inhibition experiments collectively demonstrated the key role of EPFRs and •OH in reducing the bacterial alpha diversity. Specifically, EPFRs and •OH increased the stoichiometric imbalance by promoting the release of dissolved organic carbon and ammonium N, thus aggravating the P limitation in soil. This was further confirmed by increased alkaline phosphatase activity from 702 to 874 nmol g–1 h–1. The P limitation induced by EPFRs and •OH decreased the bacterial alpha diversity, as evidenced by the negative correlation between P limitation and bacterial alpha diversity (r 2 = −0.931 to −0.979, P < 0.01) and the structural equation model. The obtained results demonstrate a ubiquitous but previously overlooked mechanism for bacterial toxicity of biochar-associated free radicals, providing scientific guidance for safe utilization of biochar.

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“…Y. Wang, Ren, et al (2020) found that severe soil erosion caused by grassland degradation on the Qinghai–Tibet Plateau led to C and N loss. Lu et al (2023) reported that precipitation indirectly regulated soil stoichiometry by affecting vegetation parameters and soil properties in the desert–grassland transition zone of northern China. The above results indicate that the driving mechanism of soil stoichiometry varies from region to region.…”

Section: Introductionmentioning

confidence: 99%

Spatial patterns of soil stoichiometry and their responses to land use in a desertified area: A case study of China's Horqin Sandy Land

Cao,

Li,

Chen

et al. 2023

Land Degrad Dev

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Ecological stoichiometry facilitates the understanding of biogeochemical cycles by studying the balance among multiple elements in ecosystems. However, the spatial patterns of soil stoichiometry and their responses to land use in desertified land are unclear. In this study, we selected 525 sample points to collect topsoil (0–20 cm) samples throughout China's Horqin Sandy Land and measured soil organic carbon (SOC), total nitrogen (TN), and total phosphorus (TP). We then calculated stoichiometric ratios (C:N:P). SOC (8.7 g kg−1), TN (0.9 g kg−1), and TP (0.3 g kg−1) were lower in this region than in Chinese and global terrestrial ecosystems due to aeolian desertification. SOC, TN, C:P, and N:P were significantly (p < 0.05) higher in grassland, followed by woodland, cropland, and sandy land. This sequence may result from the large number of dead roots that participate in the SOC turnover in grassland. TP was significantly higher in cropland due to fertilization. C:N did not differ significantly (p > 0.05) among grassland, woodland, and cropland because of the strong coupling relationship between SOC and TN. The values of SOC, TN, TP, C:P, and N:P in the Horqin Sandy Land were high in the north (dominated by mountain woodland and grassland) and were low in the south (dominated by desertified land). SOC, TN, and TP contents and C:N:P ratios were mainly affected by mean annual temperature (29.6%), land use (11.5%), and bulk density (11.4%) through their influence on soil microbial metabolism, litter and nutrient input, and soil structure, respectively. The results provide information on the overall changes in soil stoichiometry in the Horqin Sandy Land and its responses to land‐use changes, and can therefore guide ecological restoration in semiarid regions affected by desertification in the modern context of climate change.

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Patterns and driving mechanism of soil organic carbon, nitrogen, and phosphorus stoichiometry across northern China’s desert-grassland transition zone

Cited by 49 publications

References 49 publications

Fertilization can accelerate the pace of soil microbial community response to rest‐grazing duration in the three‐river source region of China

Fertilization can accelerate the pace of soil microbial community response to rest‐grazing duration in the three‐river source region of China

Biochar-Associated Free Radicals Reduce Soil Bacterial Diversity: New Insight into Ecoenzymatic Stoichiometry

Spatial patterns of soil stoichiometry and their responses to land use in a desertified area: A case study of China's Horqin Sandy Land

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