Continuous cropping obstacles: Insights from the community composition and the imbalance carbon fluxes within soil nematode food web

作者：Xiao Wang, Yang Minghao, Gao Lixiang, Yingbin Li, Wenju Liang, Xiaoke Zhang · 发表于：Geoderma · 年份：2024 · DOI：10.1016/j.geoderma.2024.117060 · 被引用次数：26 · 研究领域：Nematode management and characterization studies、Insect and Arachnid Ecology and Behavior

• Continuous cropping aggravates soil acidity, and SOC and TN decline after 20 years. • Nematode diversity and microbivore proportion were reduced by continuous cropping. • Continuous cropping disrupts carbon fluxes uniformity within nematode food webs. Long-term continuous cropping can lead to the deterioration of soil environment and the decrease of soil productivity. However, the biological mechanism on the negative effects of long-term continuous cropping has not been extensively explored. Soil nematode food web with multiple trophic levels play critical roles in nutrient cycling and energy flowing in the agroecosystem. Quantifying the carbon flux through different trophic channels within the nematode food web can indicate how continuous cropping influences carbon cycling in the agroecosystem by altering soil biota communities. Therefore, the effects of continuous peanut cropping with different years (1, 5, 20, and 30 years) on soil properties, soil nematode community composition, carbon flux within nematode food web and crop yields were investigated. Results showed that soil pH significantly decreased with increasing continuous cropping years. Differently, soil organic carbon and total nitrogen were the highest in 20-year, and decreased in 30-year of continuous cropping. As continuous cropping years increased, the relative abundance of microbivorous nematodes decreased and that of plant parasites reached as high as 76.11 % and 68.22 % in 20- and 30-year, respectively. Pe...