https://repository.kopri.re.kr/handle/201206/11903 Sat, 11 Apr 2026 20:23:05 GMT 2026-04-11T20:23:05Z https://repository.kopri.re.kr/handle/201206/13705 Title: Soil Organic Carbon and Feeding the Future: Basic Soil Processes Authors: Kim, You Jin; Jung, Ji Young; MISHRA, Umakant Abstract: Soil organic carbon (SOC) is an essential component of the global carbon (C) cycle, profoundly impacting the sustainability and resilience of agroecosystems under changing climate conditions. Soil functions, such as climate change mitigation and food production, are regulated by different properties of individual SOC pools, which are fractionated depending on their decomposability and stability. This chapter reviews literature and provides empirical evidence on the functions of fractionated SOC pools and their management strategies to mitigate climate change impacts and ensure food security. We briefly cover different SOC pools such as dissolved organic matter, soil microbial biomass, particulate organic matter, and mineral-associated organic matter. These specific SOC pools have distinct characteristics and can be measured using various fractionation methods. We document how different SOC pools affect C sequestration, nutrient supply, water retention, and crop productivity. In the last section, we review current knowledge on how soil management strategies (conservation agriculture, agroforestry, organic amendments, and biochar application) impact SOC, total nitrogen, soil porosity, and crop production compared with conventional practices. Overall, this review enhances our scientific understanding of the roles and management of SOC pools, leading to climate change mitigation and food security. Thu, 30 Dec 2021 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/13705 2021-12-30T00:00:00Z https://repository.kopri.re.kr/handle/201206/13601 Title: Disproportionate microbial responses to decadal drainage on a Siberian floodplain Authors: Kwon, Min Jung; Tripathi, Binu Mani; Goeckede, Mathias; Shin, Seung Chul; Myeong, Nu Ri; Lee, Yoo Kyung; Kim, Mincheol Abstract: Permafrost thaw induces soil hydrological changes which in turn affects carbon cycle processes in the Arctic terrestrial ecosystems. However, hydrological impacts of thawing permafrost on microbial processes and greenhouse gas (GHG) dynamics are poorly understood. This study examined changes in microbial communities using gene and genome-centric metagenomics on an Arctic floodplain subject to decadal drainage, and linked them to CO2 and CH4 flux and soil chemistry. Decadal drainage led to significant changes in the abundance, taxonomy, and functional potential of microbial communities, and these modifications well explained the changes in CO2 and CH4 fluxes between ecosystem and atmosphere―increased fungal abundances potentially increased net CO2 emission rates and highly reduced CH4 emissions in drained sites corroborated the marked decrease in the abundance of methanogens and methanotrophs. Interestingly, various microbial taxa disproportionately responded to drainage: Methanoregula, one of the key players in methanogenesis under saturated conditions, almost disappeared, and also Methylococcales methanotrophs were markedly reduced in response to drainage. Seven novel methanogen population genomes were recovered, and the metabolic reconstruction of highly correlated population genomes revealed novel syntrophic relationships between methanogenic archaea and syntrophic partners. These results provide a mechanistic view of microbial processes regulating GHG dynamics in the terrestrial carbon cycle, and disproportionate microbial responses to long-term drainage provide key information for understanding the effects of warming-induced soil drying on microbial processes in Arctic wetland ecosystems. Fri, 01 Oct 2021 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/13601 2021-10-01T00:00:00Z