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Soil Erosion Thickness and Seasonal Variations Together Drive Soil Nitrogen Dynamics at the Early Stage of Vegetation Restoration in the Dry-Hot Valley.
Liu, Wenxu; Chen, Zhe; Rong, Li; Duan, Xingwu; Qin, Yuhong; Chun, Zhenjie; Liu, Xuening; Wu, Jia; Wang, Zihao; Liu, Taicong.
Affiliation
  • Liu W; Yunnan Key Laboratory of Soil Erosion Prevention and Green Development, Yunnan University, Kunming 650500, China.
  • Chen Z; Yuanjiang Dry-Hot Valley Water and Soil Conservation Observation and Research Station of Yunnan Province, Institute of International Rivers and Eco-Security, Yunnan University, Kunming 650500, China.
  • Rong L; Yuanjiang Dry-Hot Valley Water and Soil Conservation Observation and Research Station of Yunnan Province, Institute of International Rivers and Eco-Security, Yunnan University, Kunming 650500, China.
  • Duan X; School of Ecology and Environmental Science, Yunnan University, Kunming 650500, China.
  • Qin Y; Yunnan Key Laboratory of Soil Erosion Prevention and Green Development, Yunnan University, Kunming 650500, China.
  • Chun Z; Yuanjiang Dry-Hot Valley Water and Soil Conservation Observation and Research Station of Yunnan Province, Institute of International Rivers and Eco-Security, Yunnan University, Kunming 650500, China.
  • Liu X; Yunnan Key Laboratory of Soil Erosion Prevention and Green Development, Yunnan University, Kunming 650500, China.
  • Wu J; Yuanjiang Dry-Hot Valley Water and Soil Conservation Observation and Research Station of Yunnan Province, Institute of International Rivers and Eco-Security, Yunnan University, Kunming 650500, China.
  • Wang Z; Yuanjiang Dry-Hot Valley Water and Soil Conservation Observation and Research Station of Yunnan Province, Institute of International Rivers and Eco-Security, Yunnan University, Kunming 650500, China.
  • Liu T; Yuanjiang Dry-Hot Valley Water and Soil Conservation Observation and Research Station of Yunnan Province, Institute of International Rivers and Eco-Security, Yunnan University, Kunming 650500, China.
Microorganisms ; 12(8)2024 Jul 28.
Article in En | MEDLINE | ID: mdl-39203388
ABSTRACT
By changing the physicochemical and biological properties of soil, erosion profoundly affects soil nitrogen levels, but knowledge about the erosion impact on soil nitrogen (N) dynamics is still rather incomplete. We compared soil N contents at the early stage of vegetation self-restoration in response to soil erosion thickness (0, 10, 20, 30 and 40 cm), by conducting a simulated erosion experiment on sloping arable land in the dry-hot valley of Yunnan Province, southwestern China. The results showed total nitrogen (TN), ammonium nitrogen (NH4+-N) and nitrate nitrogen (NO3--N) contents reduced with increasing soil erosion thickness and decreased significantly at the soil erosion thickness of 10, 40 and 10 cm in the rainy season and 30, 10 and 10 cm in the dry season compared with 0 cm. Structural equation modeling (SEM) indicated that soil erosion thickness and seasonal variation were the important drivers of mineral nitrogen (NH4+-N and NO3--N) content. Soil erosion thickness indirectly affected mineral nitrogen through negative on TN, carbon content and Diazotrophs (nifH genes). Dry-wet season change had an effect on mineral nitrogen mediated by arbuscular mycorrhizal fungi (AMF) and nifH genes. We also found AMF had a promotion to nifH genes in eroded soil, which can be expected to benefit nitrogen fixing. Our findings highlight the importance of considering soil erosion thickness and sampling time for nitrogen dynamics, in particular, the investigation of nitrogen limitation, in the early stage of vegetation self-restoration.
Key words

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Microorganisms Year: 2024 Document type: Article Affiliation country: Country of publication:

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Microorganisms Year: 2024 Document type: Article Affiliation country: Country of publication: