Marcela Calabi-Floody, Jorge Medina, Alan E. Richardson, María Javiera Guarda-Reyes, Pamela Villegas-Pizarro, Isidora Zirotti-Lecaros, Lizeth Mora-Pérez, Humberto Aponte, Heike Knicker, Cornelia Rumpel, María de la Luz Mora
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引用次数: 0
Abstract
This study aimed to evaluate the potential of two carbon (C)-rich carrier materials derived from agricultural residues, spent mushroom substrate (SMS) and composted wheat straw (CWS) for enhancing soil carbon stabilization in an Andisol, with a view towards their future application in smart fertilizer design. We investigated how their contrasting nitrogen contents and application rates affect soil organic carbon dynamics and contribute to sustainable soil management and climate change mitigation. Soil incubations were conducted over 365 days, during which C mineralization, enzymatic activities, and C and N sequestration were assessed. SMS addition at both low and high rates (0.5% and 1% soil C increase, respectively) enhanced soil organic carbon (SOC) stabilization, increasing mean residence times (40.6 and 48.8 years) and half-life times (28.1 and 33.8 years) of the stable C pool compared to unamended soil (35.9 and 24.9 years). High-rate CWS application (1% soil C increase) promoted native SOC decomposition, increasing C losses (5.8%) and reducing C sequestration potential (96%). However, low-rate CWS application (0.5% soil C increase) showed promise, increasing mean residence time (46.8 years) and half-life time (32.4 years) of the stable C pool. Spearman correlations revealed positive associations between electrical conductivity, total N, humification indices, and C stabilization parameters, highlighting the importance of nutrient availability and humification potential for C stabilization. Incorporating C-rich carrier materials with balanced nutrient content, such as SMS, can enhance soil C stabilization and support climate-smart agriculture goals. Low-rate CWS application also shows potential as an alternative C-rich carrier material. However, careful consideration of application rates and material properties is crucial to avoid adverse effects on native SOC mineralization.
期刊介绍:
The Journal of Soil Science and Plant Nutrition is an international, peer reviewed journal devoted to publishing original research findings in the areas of soil science, plant nutrition, agriculture and environmental science.
Soil sciences submissions may cover physics, chemistry, biology, microbiology, mineralogy, ecology, pedology, soil classification and amelioration.
Plant nutrition and agriculture submissions may include plant production, physiology and metabolism of plants, plant ecology, diversity and sustainability of agricultural systems, organic and inorganic fertilization in relation to their impact on yields, quality of plants and ecological systems, and agroecosystems studies.
Submissions covering soil degradation, environmental pollution, nature conservation, and environmental protection are also welcome.
The journal considers for publication original research articles, technical notes, short communication, and reviews (both voluntary and by invitation), and letters to the editor.