Temperature sensitivity of soil enzyme kinetics under N and P fertilization in an alpine grassland, China

Wu, Yang; Zhou, Huakun; Sun, Wei; Zhao, QiFan; Liang, Meng; Chen, Wenjing; Guo, Ziqi; Jiang, YaoKun; Jiang, Yue; Liu, Guobin; Xue, Sha

doi:10.1016/j.scitotenv.2022.156042

Cited by 11 publications

(4 citation statements)

References 41 publications

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“…where J ′ : Pielou evenness index; Pi: relative importance value of each species; S: number of species MA = (S − 1)/LnN (4) where MA: Margarlef richness index; S: number of species; N: abundance.…”

Section: Measurement Parametersmentioning

confidence: 99%

“…Urgent ecological restoration measures are needed to promote the sustainable management and utilization of grasslands [3]. Since the 1960s, China has implemented a series of restoration and improvement measures, such as enclosures, shallow plowing, rotational grazing, resting pastures, root restoration, and fertilization, to restore degraded grasslands [4]. These measures have provided important theoretical and practical guidance for addressing the ecological restoration of degraded grasslands in China.…”

Section: Introductionmentioning

confidence: 99%

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Investigation into the Effects of Different Restoration Techniques on the Soil Nutrient Status in Degraded Stipa grandis Grassland

Zhang,

Yu,

Shan

et al. 2023

Agronomy

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The degradation and desertification of grassland ecosystems have garnered significant attention both domestically and internationally. Grassland restoration techniques are widely considered a principal measure to promote the sustainable utilization of grasslands, with soil nutrient content being a core indicator for assessing the effectiveness of restoration in degraded grasslands. This study aims to explore the differential impacts of various grassland restoration methods on soil nutrient distribution in degraded Stipa grandis grasslands. Three major restoration methods, i.e., root cutting, enclosure, and fertilization, were applied in the study area. The soil nutrient content was measured and analyzed under the different restoration methods and at varying depths. The results revealed that under all three restoration methods and at different soil depths (0–10 cm, 10–20 cm, 20–30 cm), the organic matter, total nitrogen, total phosphorus, alkali-hydrolyzable nitrogen, alkali-hydrolyzable phosphorus, and available potassium contents were significantly higher than those in the control group (p < 0.05). Furthermore, as soil depth increased, the contents of organic matter and all nutrients gradually decreased. Specifically, regarding the contents of different nutrients, the order of organic matter, total nitrogen, total phosphorus, alkali-hydrolyzable nitrogen, and available phosphorus was as follows: fertilization > enclosure > root cutting > control, while the contents of total potassium and available potassium followed the sequence: fertilization > enclosure > control > root cutting. Additionally, based on the canonical correlation analysis (R2 = 0.88), the total phosphorus content in soil had the greatest impact on soil nutrients, while vegetation cover and plant height contributed the most to vegetation characteristics. In grassland restoration, the increase in soil total phosphorus led to higher vegetation cover and height, mildly influenced plant diversity and density, and simultaneously promoted biomass accumulation. These research findings provide a solid theoretical foundation for the application of grassland restoration techniques, contributing to the sustainable development of grassland ecosystems.

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Section: Measurement Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation into the Effects of Different Restoration Techniques on the Soil Nutrient Status in Degraded Stipa grandis Grassland

Zhang,

Yu,

Shan

et al. 2023

Agronomy

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“…However, there are few reports on the soil enzyme activities involved in straw decomposition at different temperatures. Previous studies have reported that the temperature sensitivity (Q 10 ) of soil enzyme activity is less than that of CO 2 emissions and that long-term warming reduces the temperature sensitivity of soil enzymes by decreasing the maximum potential activity (V max ) and increasing their half-saturation constant (K m ) [18][19][20][21]. Based on the unique high-temperature and high-humidity internal environment of greenhouse vegetables, there is an urgent need to study the changes in soil enzyme activity during straw decomposition at different temperatures.…”

Section: Introductionmentioning

confidence: 99%

Temperature Matters More than Fertilization for Straw Decomposition in the Soil of Greenhouse Vegetable Field

Ma,

Li,

Luan

et al. 2024

Agronomy

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As the largest organic carbon input to agroecosystems, crop straw can solve the problem of soil quality degradation in greenhouse vegetable fields, harmonize the balance between soil nutrients and energy, and improve soil quality to maintain the sustainable production of greenhouse vegetables. However, the microbial mechanism of the straw decomposition process under different temperatures and fertilization treatments in greenhouse vegetable soils has not been clarified. Soil samples were used to investigate the biology of straw decomposition in the soil at three incubation temperatures (15, 25, and 35 °C) through a soil incubation experiment (60 d) under different fertilization treatments. Fertilization treatments for this long-term field experiment included chemical fertilizer (CF), substitution of half of the chemical N fertilizer with manure (CM), straw (CS), or combined manure and straw (CMS). The results showed that soil hydrolase activities tended to decrease with increasing temperature during straw decomposition. Compared with the CF, organic substitutions (CM, CMS, and CS) increased soil β-glucosidase, β-cellobiosidase, N-acetyl-glucosaminidase, and β-xylosidase activities during straw decomposition. Soil CO2 emission rates were the highest at each incubation temperature on the first day, rapidly declining at 25 °C and 35 °C and slowly declining at 15 °C. The soil CO2 cumulative emissions tended to increase with increasing temperature under different fertilization treatments. PCA showed that the responses of soil enzyme activities to temperature at 7, 15, and 30 d of straw decomposition were stronger than those of fertilization. In summary, both fertilization treatment and incubation temperature could influence soil CO2 emissions by affecting soil physicochemical properties and enzyme activities during straw decomposition, whereas incubation temperature had a stronger effect on straw decomposition than fertilization, as indicated by PLS-PM and three-way ANOVA. Considering the influence for fertilization on the straw decomposition process at different incubation temperatures, the straw applications (CMS and CS) were more suitable to temperature changes.

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“…These processes are also influenced by external environmental conditions like resources, mediated and regulated by temperature as predicted by the metabolic theory of ecology (Brown et al, 2004; Zhao, Chen, et al, 2022). For example, more available resources, such as nitrogen and phosphorus (Pellerin et al, 2022; Shi, Cai, et al, 2022; Wu et al, 2022), are also thought to increase the production and kinetics of extracellular enzymes, thereby promoting microbial carbon utilization (Qin et al, 2022). Other environmental factors, such as moisture, pH and oxygen availability, also alter microbial growth and enzyme kinetics, which in turn affect carbon emissions (Wu et al, 2022; Zheng et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Temperature‐mediated microbial carbon utilization in China's lakes

Guo

et al. 2023

Global Change Biology

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Microbes play an important role in aquatic carbon cycling but we have a limited understanding of their functional responses to changes in temperature across large geographic areas. Here, we explored how microbial communities utilized different carbon substrates and the underlying ecological mechanisms along a space-for-time substitution temperature gradient of future climate change. The gradient included 47 lakes from five major lake regions in China spanning a difference of nearly 15°C in mean annual temperatures (MAT). Our results indicated that lakes from warmer regions generally had lower values of variables related to carbon concentrations and greater carbon utilization than those from colder regions. The greater utilization of carbon substrates under higher temperatures could be attributed to changes in bacterial community composition, with a greater abundance of Cyanobacteria and Actinobacteriota and less Proteobacteria in warmer lake regions. We also found that the core species in microbial networks changed with increasing temperature, from Hydrogenophaga and Rhodobacteraceae, which inhibited the utilization of amino acids and carbohydrates, to the CL500-29-marine-group, which promoted the utilization of all almost carbon substrates. Overall, our findings suggest that temperature can mediate aquatic carbon utilization by changing the interactions between bacteria and individual carbon substrates, and the discovery of core species that affect carbon utilization provides insight into potential carbon sequestration within inland water bodies under future climate warming.

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Temperature sensitivity of soil enzyme kinetics under N and P fertilization in an alpine grassland, China

Cited by 11 publications

References 41 publications

Investigation into the Effects of Different Restoration Techniques on the Soil Nutrient Status in Degraded Stipa grandis Grassland

Investigation into the Effects of Different Restoration Techniques on the Soil Nutrient Status in Degraded Stipa grandis Grassland

Temperature Matters More than Fertilization for Straw Decomposition in the Soil of Greenhouse Vegetable Field

Temperature‐mediated microbial carbon utilization in China's lakes

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