Yunpeng Qiu1,2, Lijin Guo1,3, Xinyu Xu2, Lin Zhang2, Kangcheng Zhang2, Mengfei Chen2, Yexin Zhao2, Kent O Burkey4,5, H David Shew1, Richard W Zobel5, Yi Zhang6, Shuijin Hu7,2. 1. Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC 27695, USA. 2. College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China. 3. Key Laboratory of Genetics and Germplasm Innovation of Tropical Special Forest Trees and Ornamental Plants, Ministry of Education, College of Forestry, Hainan University, Haikou, Hainan 570228, China. 4. Plant Sciences Research Unit, USDA-ARS, Raleigh, NC 27607, USA. 5. Department of Crop and Soil Sciences, North Carolina State University, Raleigh, NC 27695, USA. 6. College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China. shuijin_hu@ncsu.edu zhangyi2016@njau.edu.cn. 7. Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC 27695, USA. shuijin_hu@ncsu.edu zhangyi2016@njau.edu.cn.
Abstract
Climate warming and elevated ozone (eO3) are important climate change components that can affect plant growth and plant-microbe interactions. However, the resulting impact on soil carbon (C) dynamics, as well as the underlying mechanisms, remains unclear. Here, we show that warming, eO3, and their combination induce tradeoffs between roots and their symbiotic arbuscular mycorrhizal fungi (AMF) and stimulate organic C decomposition in a nontilled soybean agroecosystem. While warming and eO3 reduced root biomass, tissue density, and AMF colonization, they increased specific root length and promoted decomposition of both native and newly added organic C. Also, they shifted AMF community composition in favor of the genus Paraglomus with high nutrient-absorbing hyphal surface over the genus Glomus prone to protection of soil organic C. Our findings provide deep insights into plant-microbial interactive responses to warming and eO3 and how these responses may modulate soil organic C dynamics under future climate change scenarios.
Climate warming apan class="Chemical">nd elevated ozone (eO3) are important climate change components that can affect plant growth and plant-microbe interactions. However, the resulting impact on soil carbon (C) dynamics, as well as the underlying mechanisms, remains unclear. Here, we show that warming, eO3, and their combination induce tradeoffs between roots and their symbiotic arbuscular mycorrhizal fungi (AMF) and stimulate organic C decomposition in a nontilled soybean agroecosystem. While warming and eO3 reduced root biomass, tissue density, and AMF colonization, they increased specific root length and promoted decomposition of both native and newly added organic C. Also, they shifted AMF community composition in favor of the genus Paraglomus with high nutrient-absorbing hyphal surface over the genus Glomus prone to protection of soil organic C. Our findings provide deep insights into plant-microbial interactive responses to warming and eO3 and how these responses may modulate soil organic C dynamics under future climate change scenarios.