Beta-Glucosidase Activity in Paddy Soils of the Taihu Lake Region, China1
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Fertilization promotes microbial growth and minimum tillage increases nutrient-acquiring enzyme activities in a semiarid agro-ecosystem
2022, Applied Soil EcologyCitation Excerpt :Responses of the microbial community to depletion of resources with soil depth included reductions in total and growing biomass, activities (Vmax) of plant- and microbial-residue decomposing enzymes as well as increases in activities and changes in substrate-affinities (Km values) of nutrient-acquisition enzyme systems. This is consistent with expectations, as enzymatic activities are generally reduced in deeper soil layers by the higher bulk density, lower oxygen availability (Davidson et al., 2012; Kleber, 2010; Schnecker et al., 2015), and lower abundance of simple sugars for microorganisms (Tiwari et al., 2019; Xiao-Chang and Qin, 2006). However, the Vmax of LAP slightly increased with soil depth, especially in unfertilized plots, indicating a nitrogen acquisition strategy (Sinsabaugh and Moorhead, 1994).
Soil community richness and composition jointly influence the multifunctionality of soil along the forest-steppe ecotone
2022, Ecological IndicatorsCitation Excerpt :Litter TC and litter TN were also analyzed with an automatic elemental analyzer. Soil TP was measured by the molybdenum blue method (Wang and Lu, 2006). Soil DOC was extracted from fresh soil samples with a 1:2 ratio of soil to water.
Mechanisms of multifarious soil microbial enzymes in plant growth promotion and environmental sustainability
2022, Bioprospecting of Microbial Diversity: Challenges and Applications in Biochemical Industry, Agriculture and Environment ProtectionMaize genotype-specific exudation strategies: An adaptive mechanism to increase microbial activity in the rhizosphere
2021, Soil Biology and BiochemistryCitation Excerpt :Root hairs are usually abundant only 1–5 cm above the root tip (Jungk, 2001), but the rhizodeposits formed when such hairs break and lyse promote microbial activity in the rhizosphere of the root region above 5–6 cm from the root tip, as the root continues growing. These root-hair rhizodeposits, along with the released exudates, increase the active portion of microbial biomass in the rhizosphere (Zhang et al., 2020) and therefore stimulate β-glucosidase production (Wang and Lu, 2006). Generally, the presence of root hairs enlarged the enzymatic rhizosphere by up to 50% (Greenfield et al., 2021; Ma et al., 2018b), which our study also confirmed for β-glucosidase activity (+35% of rhizosphere extent) (Fig. 2).
Latitudinal patterns of soil extracellular enzyme activities and their controlling factors in Pinus massoniana plantations in subtropical China
2021, Forest Ecology and ManagementCitation Excerpt :Soil total P content was determined by plasma emission spectroscopy (IRIS Intrepid Ⅱ XSP, Thermo Fisher Scientific, USA) following digestion with NHO3-HClO4-HF (He et al., 2020). Soil available N content was determined by conversion to NH + 4 under NaOH conditions (1.8 mol L−1), collection in an H3BO3 solution (2%), and subsequent titration with a standard HCl solution (0.01 mol L−1) (Wang and Lu, 2006). Soil available P content was analyzed using a continuous flow analyser (Analytical AA3 Auto Analyser, SEAL, Germany) after extraction with HCl-H2SO4 solution (Cui et al., 2018).
Changes in carbon pools and enzyme activities in soil amended with pig slurry derived from different feeding diets and filtration process
2020, GeodermaCitation Excerpt :The negative relationship between Cmic and pH observed in this study has also been observed in previous studies (Pietri and Brookes, 2008; Vance et al., 1987a). The main reason for this could be the limited activity of the microbial population in alkaline soil, and that the activity increased with decreasing pH. Microbial metabolism and enzyme activities are highly dependent on soil pH (Eivazi and Tabatabai, 1990; Xiao-Chang and Qin, 2006). Cmic was nevertheless more affected by sampling time than by the type of pig slurry (Fig. 3).
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Project supported by the National Natural Science Foundation of China (No. 40371066) and the National Key Basic Research Support Foundation of China (No. G1999011808).