Van Horn1, M. Lee Van Horn2, John E. Barrett3, Michael N. Gooseff4, Adam E. Altrichter3, Kevin M. Geyer3, Lydia … Copyright: © 2018 Li et al. Stepwise multiple regression analysis was applied to determine the key factors influencing microbial properties. Funding: This work was supported by the National Natural Science Foundation of China (41571298), and the International (Regional) Joint Research Program (41620104006). a comparative assessment of factors which influence microbial biomass carbon and nitrogen levels in soil Soil available P was extracted with 0.5 M NaHCO3. At the end of the 1st month, the contributions of soil type and organic material type were significant in explaining the variance in MBC and MBN, and explained 6.9 and 43.6% of the variance in MBC, as well as 9.3 and 50.9% of the variance in MBN, respectively (P < 0.05; Table 3). doi: 10.1371/journal.pone.0203812. Soil available K was extracted with 1 M NH4OAc. The Calcaric Cambisol developed from alluvial sediments of the Yellow River was located in Yuanyang County, Henan Province; this region has a temperate sub-humid climate, with an annual average temperature of 14.5°C and an average annual rainfall of 450–600 mm. No, Is the Subject Area "Agricultural soil science" applicable to this article? For more information about PLOS Subject Areas, click When compared with the manures, crop residues, in particular straws with low lignin and high C/N ratio, significantly increased the functional diversity indices at both sampling periods (P < 0.05). li dp 1964@sohu.Com These results suggest that the application of crop straw is a long-term effective measure to increase microbial biomass, and can further induce the changes of soil properties to regulate soil microbial community. Conceptualization, Organic material quality played a predominant role in controlling the microbial biomass at both sampling periods, and the main parameters of organic matter were C/N ratio and N content. Lignin is resistant to biodegradation and higher lignin content depresses microbial metabolism; this resulted in the negative correlation between lignin content and the diversity indices (Shannon and Simpson indices) in different organic material treatments at the end of the 1st month [17, 45]. Ferralic Cambisol is found in the subtropical region with an acidic soil environment [35], Calcaric Cambisol is found in the warm temperate region with a weak basic or neutral soil environment, and Calcaric Cambiso is found in the cold temperate region with a weak acidic or neutral soil environment. The WS, CS, WR and CR treatments significantly increased the MBC while only the WS and CS treatments significantly increased the MBN when compared with the control in the three soils (P < 0.05, Fig 2B and 2D). The average well color development (AWCD) and the functional diversity indices including Shannon, Simpson and McIntosh indices were often used to investigate the general structure and functional potential of soil microbial communities [13, 24]. Soils and organic materials were analyzed for organic C and total C by dichromate oxidation and total N by Kjeldahl digestion. Carbon sources can provide energy for microorganisms [46–47], and microorganisms can grow rapidly when they encounter abundant C sources, e.g., the significant increase in MBC in organic materials amendment treatments when compared with the control treatment in the three soils at the end of the 1st month (Fig 2). When compared with the end of the 1st month, the MBC at the end of the 12th month decreased by 21.5–28.7%, and the MBN at the end of the 12th month increased by 62.9–143.7% in the three soils (Fig 2). All the organic materials were oven-dried at 60°C, and passed through a 2-mm sieve. Although nutrient status, seasonality, soil factors, temperature, and other factors, are important drivers to control functioning of dry tropical forest ecosystem, SMB could be one of the vital factors affecting productivity in the tropical dry deciduous forests, as observed in the Vindhyan plateau (Singh et al., 2010). It increases with reducing soil water content or increasing suction up The high precipitation in the study site would leach the soluble acid ions into the litter bags, thus limiting organic matter availability and inhibiting microbial metabolism (Fig 1) [63–64]. Our observations suggest that grazing m anagement may change soil carbon sequestration rates in 2018 Sep 13;13(9):e0203812. It has been showed that soil microbial diversity decreased with the increase of latitude and was positively correlated with air temperature [68], and Luvic Phaeozem in this study was developed from the highest latitude and the annual average temperature (4–5°C) in its local region was lower than the other two soils. Microbial biomass carbon and Shannon’s diversity index after amendment with labile organic materials with low lignin content were significantly higher than that after amendment with recalcitrant organic materials with high lignin content [16–17]. Soil parent material provides the basic nutritional environment for development of the microbial community [22–23], and during soil formation the soil microbial communities can be changed [19, 21]. Writing – original draft, Corg, N) are controlled by factors such as climate, vegetation and relief even on a small scale. Soil and rhizosphere microbial communities in agroecosystems may be affected by soil, climate, plant species, and management. For more information about PLOS Subject Areas, click https://doi.org/10.1371/journal.pone.0203812, Editor: Jingdong Mao, Old Dominion University, UNITED STATES, Received: March 9, 2018; Accepted: August 28, 2018; Published: September 13, 2018. In agricultural systems, the available organic materials generally include crop residues and livestock manures; crop residues are characterized by higher C:N ratio and lower available nutrient content in comparison with manure [15]. A low biomass quotient or a high respiration quotient is considered to be an indication of stress from, for example, toxicity from metals in sewage sludge … Conceptualization, Is the Subject Area "Organic materials" applicable to this article? At the end of the 1st month, the ANOVA for principal component 1 (PC1) indicated that the patterns of substrate utilization between the organic materials and the control treatments were significantly different in Ferralic Cambisol and Luvic Phaeozem (P < 0.05), and that they were significantly different between the WS and CS treatments and the control in Calcaric Cambisol (P < 0.05, Fig 4A–4C). Discover a faster, simpler path to publishing in a high-quality journal. Biochar application to soil has been proposed as a potential management strategy to enhance soil carbon (C) sequestration, reduce greenhouse gas emission, improve soil quality, and increase crop productivity. Writing – review & editing, Roles Writing – review & editing, Roles Microbial CLPPs in soil were determined by Biolog Eco plates (Biolog, Hayward, CA, USA). This work was supported by the National Natural Science Foundation of China (41571298), and the International (Regional) Joint Research Program (41620104006). Soil microbial biomass: A key soil driver in management of ecosystem functioning. Data curation, Investigation, Author information: (1)Department of Environmental Microbiology, Babasaheb Bhimrao Ambedkar (Central) University, Raebarelly Road, Lucknow 226025, Uttar Pradesh, India. The effects of biochar on soil microbial and enzyme activities are integrally linked to the potential of biochar in achieving these benefits. The integrated effect of soil type and organic material amendment significantly (P < 0.05) affected the microbial functional diversity. It is suggested that the microbial biomass and dehydrogenase activity expressed on a soil organic matter basis could become useful … Yes Abstract. Meanwhile, the low pH in the Ferralic Cambisol (pH = 5.2) would reduce the utilization of labile substrate by soil microbes [56–57] because of the toxic exchangeable Al in low pH soil [58]; however, the integrated effect of SOC, clay content and organic materials amendment could affect the response of microbial biomass to pH as shown by the non-significance of pH in explaining microbial biomass in the stepwise multiple regression analysis. Microbial biomass carbon (MBC), microbial biomass nitrogen (MBN), soil organic carbon (SOC) and total nitrogen (TN) in the 0- to 15-cm and 15- to 30-cm soil layers were investigated by making chemical and biological measurements in the montane region of eastern Liaoning Province, Northeast China, during the growing season of 2008 in stands of NSF and Larix olgensis plantation (LOP). 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