Topography-driven differences in soil N transformation constrain N availability in karst ecosystems
文献类型: 外文期刊
第一作者: Wen, Dongni
作者: Wen, Dongni;Elrys, Ahmed S.;Meng, Lei;Wen, Dongni;Yang, Lin;Zhu, Tongbin;Ni, Kang;Xu, Xingliang;Yu, Longfei;Zhou, Jinxing;Zhu, Tongbin;Mueller, Christoph;Mueller, Christoph;Mueller, Christoph;Mueller, Christoph;Zhu, Tongbin
作者机构:
关键词: Karst region; Topographic gradient; Nitrogen availability; Soil microbes; Gross N transformation rates
期刊名称:SCIENCE OF THE TOTAL ENVIRONMENT ( 影响因子:9.8; 五年影响因子:9.6 )
ISSN: 0048-9697
年卷期: 2024 年 908 卷
页码:
收录情况: SCI
摘要: Fragile karst ecosystems are characterized by complex topographic landscapes associated with high variations in vegetation restoration. Identifying the characteristics and driving factors of nitrogen (N) availability across the topographic gradient is essential to guide vegetation restoration in karst regions. In this study, we collected soil samples and plant leaves along the topographic gradient (ridge, upper slope, middle slope, and foot slope) of convex slopes in the karst fault basin of southwest China, and determined the indicators reflecting soil N availability, N transformation rates, and their controlling factors. Our results showed that foliar N content and 615N value, soil inorganic N content and 615N value, and foliar N:P ratio were substantially lower on the steep hillslopes than on the flat top ridge. Steep slope soils also had a lower enzyme C:N ratio but a higher enzyme N:P ratio than the flat ridge soils. Furthermore, the vector angles calculated by soil extracellular enzyme analysis were below 45o in all studied soils and decreased significantly with increasing slope, indicating that microbial growth was generally limited by N. These results jointly suggest the declines in soil N availability across the topographic gradient, which are further explained by the changes in soil inherent N transformation processes. As the slope became steeper, soil mineralization and autotrophic nitrification (ONH4) rates decreased significantly, while ratio of microbial NH4+ immobilization to ONH4 and NH4+ adsorption rate increased significantly, indicating the decrease in soil inorganic N supply capacity. We further found that deteriorated soil structure, decreased soil organic matter and calcium content, altered microbial abundance, and increased ratios of fungi to bacteria and gram-positive bacteria to gram-negative bacteria were the primary drivers of reduced N transformation rates and N availability across the topographic gradient. Overall, this study highlights the critical role of the topography in controlling soil N availability by regulating N transformation processes in karst regions. The topography should be considered an important factor affecting the functions and services of karst ecosystems.
分类号:
- 相关文献
作者其他论文 更多>>
-
Long-term nitrogen addition increases denitrification potential and functional gene abundance and changes denitrifying communities in acidic tea plantation soil
作者:Yang, Xiangde;Ni, Kang;Shi, Yuanzhi;Yi, Xiaoyun;Ma, Lifeng;Ruan, Jianyun;Tang, Sheng;Ma, Qingxu;Cai, Yanjiang
关键词:Long-term N addition; Denitrification potential; Functional genes; Denitrifying microbial communities; Acidic tea plantation soil
-
Metagenomics reveals N-induced changes in carbon-degrading genes and microbial communities of tea (Camellia sinensis L.) plantation soil under long-term fertilization
作者:Yang, Xiangde;Ni, Kang;Shi, Yuanzhi;Yi, Xiaoyun;Wei, Sirou;Jiang, Yanyan;Zhang, Yongli;Ma, Lifeng;Ruan, Jianyun;Ji, Lingfei;Cai, Yanjiang;Ma, Qingxu;Tang, Sheng
关键词:N application; C -cycling genes; SOC-degrading enzymes; Functional microbial communities; Acidic soil; Tea plantation
-
Identification of a new allele of BraA09g066480.3C controlling the wax-less phenotype of Chinese cabbage
作者:Liu, Chuanhong;Yu, Longfei;Yang, Lu;Tan, Chong;Ye, Xueling;Liu, Zhiyong;Shi, Fengyan
关键词:Flowering Chinese cabbage; Epidermal wax; Bulked segregant analysis (BSA); Transcriptome sequencing
-
Optimal conditions for pressure shock induction of triploidy in turbot and a comparison of induction efficiency with cold shock
作者:Meng, Zhen;Zhang, Bangyin;Song, Chuer;Yang, Lin;Liu, Xinfu;Jia, Yudong;Meng, Zhen;Yang, Zhi;Zhang, Hesen
关键词:Scophthalmus maximus; Turbot; Triploid; Hydrostatic pressure treatment
-
Enhancing Soil Nitrogen Retention Capacity by Biochar Incorporation in the Acidic Soil of Pomelo Orchards: The Crucial Role of pH
作者:Qian, Xiaojie;Chen, Hongmei;Yi, Zhigang;Li, Qinghua;Zhao, Lin;Wang, Fei;Zhang, Yushu;Zhang, Jinbo;Zhang, Jinbo;Mueller, Christoph;Mueller, Christoph;Mueller, Christoph;Mueller, Christoph
关键词:nitrogen retention capacity; soil pH; biochar incorporation; TM; TI; O-NH4
-
A tool to automatically design multiplex PCR primer pairs for specific targets using diverse templates
作者:Yang, Lin;Lin, Qiang;Xie, Junhua;Fan, Wei;Cui, Peng;Liu, Wanfei;Yang, Lin;Dai, Fangyin;Ding, Feng;Xie, Junhua;Xie, Junhua
关键词:
-
Preservation of citrus fruit, and dissipation by diffusion and degradation of postharvest pesticides during storage
作者:Li, Minmin;Li, Lin;Yang, Lin;Feng, Bing;Cui, Ying;Fan, Bei;Wang, Fengzhong;Li, Minmin;Zhao, Shanshan;Kong, Zhiqiang;Lin, Xingyu;Simal-Gandara, Jesus
关键词:Postharvest pesticides; Degradation behavior; Preservation; Carbendazim; Metabolites