Molecular-level characteristics of soil organic carbon in rhizosheaths from a semiarid grassland of North China

Mo，Xiaohan1,2,3; Wang，Mengke1,2; Wang，Yinghui1,2; Chen，Xunwen1,2; Zhang，Ang4; Zeng，Hui3; Zheng，Yan1,2; Kong，Deliang5; Wang，Junjian1,2

2022-07-01

10.1016/j.soilbio.2022.108682

SOIL BIOLOGY & BIOCHEMISTRY   影响因子和分区

0038-0717

1879-3428

Rhizosheaths are aggregated, sheath-like soils that physically adhere to root surface, and they form on herbaceous plant roots worldwide, especially in semiarid grasslands. Representing a strong root−soil−microbe interaction, the rhizosheaths are expected to have distinct soil organic carbon (SOC) signatures from rhizosphere soils of non-rhizosheath forming plants. However, such signatures remain unclear, which hinders our understanding of root effects on SOC cycling in grasslands. We compared SOC characteristics between rhizosheath and non-rhizosheath soils of eight herbaceous plant species, collected from a semiarid grassland of North China, using solid-state C nuclear magnetic resonance spectroscopy and biomarker analyses. We further examined the temporal dynamics of SOC characteristics of rhizosheath soils from early, middle, and late plant growth stages. Compared to non-rhizosheath SOC, rhizosheath SOC had more root inputs of both labile substrates (carbohydrates and free alkanoic acids) and relatively recalcitrant suberin- and lignin-derived compounds. Moreover, the labile inputs provided more substrates for microbial degradation of cutin-derived compounds. These indicators of labile substrate availability increased significantly from the early to late growth stages. Overall, our findings clarify the molecular characteristics of rhizosheath SOC and its temporal dynamics, both of which suggest a critical role of rhizosheath in shaping the rhizosphere microenvironment and regulating SOC cycling.

Biomarker Carbon cycle Grassland Rhizosheath Soil organic carbon

SCI ; EI

英语

第一 ; 通讯

Basic and Applied Basic Research Foundation of Guangdong Province[2021B1515020082];National Natural Science Foundation of China[41807360];National Natural Science Foundation of China[42122054];National Natural Science Foundation of China[42192513];

Agriculture

Soil Science

WOS:000804426600002

PERGAMON-ELSEVIER SCIENCE LTD

20222112136356

Biodegradation ; Biomarkers ; Nuclear magnetic resonance spectroscopy ; Organic carbon ; Substrates ; Vegetation

Biotechnology:461.8 ; Soils and Soil Mechanics:483.1 ; Biochemistry:801.2 ; Organic Compounds:804.1

AGRICULTURAL SCIENCES

2-s2.0-85130162138

Scopus

1.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.School of Urban Planning and Design,Peking University Shenzhen Graduate School,Peking University,Shenzhen,Guangdong,518055,China
4.Spice and Beverage Research Institute,Chinese Academy of Tropical Agricultural Sciences,Wanning,571533,China
5.College of Forestry,Henan Agricultural University,Zhengzhou,450002,China

Mo，Xiaohan,Wang，Mengke,Wang，Yinghui,et al. Molecular-level characteristics of soil organic carbon in rhizosheaths from a semiarid grassland of North China[J]. SOIL BIOLOGY & BIOCHEMISTRY,2022,170.

Mo，Xiaohan.,Wang，Mengke.,Wang，Yinghui.,Chen，Xunwen.,Zhang，Ang.,...&Wang，Junjian.(2022).Molecular-level characteristics of soil organic carbon in rhizosheaths from a semiarid grassland of North China.SOIL BIOLOGY & BIOCHEMISTRY,170.

Mo，Xiaohan,et al."Molecular-level characteristics of soil organic carbon in rhizosheaths from a semiarid grassland of North China".SOIL BIOLOGY & BIOCHEMISTRY 170(2022).