Effects of Land Use on the Mineralization of Organic Matter in Ultisol

Abstract

Soil organic matter mineralization changed by land-use types is still not clearly understood. In this study, soils from typical land-use types including adjacent plantations of bamboo (Bam), camphor (Cam), and tea (Tea) were chosen to systematically investigate the role of organic carbon components and microbial community compositions in the organic matter mineralization in Ultisol. The mineralization of organic matter followed the sequence Bam < Cam < Tea. The higher carbon contents of labile pools were in the Cam and the Tea than that in the Bam. The carbon content of dissolved organic matter (DOM) showed the order Bam < Cam < Tea, whereas the complexity of chemical structure in DOM followed the opposite trend. The land-use types significant shifted the bacterial and fungal communities, and the relative abundances of bacterial or fungal phyla of Actinobacteria, Acidobacteria, Firmicutes, and Basidiomycota were significantly different among the land-use types. The multivariate regression tree results showed that the total organic carbon and/or the C/N ratio were dominant factors in influencing the bacterial and fungal communities. Moreover, the redundancy analysis results demonstrated that the communities of bacteria and fungi in Bam, Cam, and Tea were tightly linked to the C/N ratio, the pH and the labile pool I carbon, and the DOM, respectively. The Pearson’s correlation results revealed that the mineralization of organic matter was significantly correlated with the organic carbon components, but generally not the microbial community compositions, which implied that the organic carbon components were perhaps the major determinant in controlling the organic matter mineralization in Ultisol.

Prediction Model of Flavonoids Content in Ancient Tree Sun−Dried Green Tea under Abiotic Stress Based on LASSO−Cox

“…The present study selects ancient tree sun-dried green tea from Laowu Mountain as the research subjects and aims to explore the contribution of diverse environmental factors (for instance, altitude [17], soil pH [18], organic matter [19], and potassium content [20]) on the flavonoids content in sun-dried green tea. Through the construction of a multiple regression model, our goal is to explore the correlation between environmental factors and the content of flavonoids to provide a fundamental model for soil management [21] in ancient tea gardens, secondary metabolism in ancient tea trees [22], and quality prediction [23] and control of ancient tea [24].…”

Combination of Liquid Organic and Chemical Fertilizer on Corn and Soybean Using Intercropping in Ultisols

“…Reduced availability of calcium, magnesium, phosphorus, and molybdenum are elements in the soil solution. So, plant growth is stunted, and plant production decreases due to low soil organic matter content [3].…”

Soil Sustainability in the Anthropocene

“…The research article of Xu et al [2], investigated the impact of land-use types on soil organic matter mineralization. The authors selected typical land-use types and systematically examined the role of organic carbon composition and microbial community composition in the mineralization process of organic matter in Ultisol.…”