| 模拟根系分泌物输入对森林土壤氮转化的影响研究综述 |
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| 引用本文： | 蔡银美,张成富,赵庆霞,李昕颖,何腾兵.模拟根系分泌物输入对森林土壤氮转化的影响研究综述[J].浙江农林大学学报,2021,38(5):916-925. |
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| 作者姓名： | 蔡银美 张成富 赵庆霞 李昕颖 何腾兵 |
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| 作者单位： | 1.贵州大学 农学院，贵州 贵阳 5500252.贵州大学 新农村发展研究院，贵州 贵阳 550025 |
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| 基金项目： | 贵州省科技厅基础条件平台建设项目(黔科合平台人才〔2019〕5701号)；贵州大学引进人才科研项目(贵大人基合字〔2017〕68号) |
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| 摘 要： | 在全球气候变化加速植物生长和生物量积累的背景下，氮素是森林生态系统初级生产力的主要限制因子之一。根系分泌物所介导的根际微生物过程在驱动森林生态系统土壤养分循环和增加氮素有效性方面具有重要意义。基于此，本研究综述了模拟根系分泌物输入对森林土壤氮素矿化、硝化与反硝化过程的影响及其机制。发现根系分泌物中的有机酸、糖类和氨基酸等物质均能促进有机质的分解和氮素矿化，在一定程度上能缓解植物对氮的需求。不同碳含量和碳氮比的根系分泌物输入驱动根际微生物行使不同养分利用策略，通过生物和非生物作用，根系分泌物矿化有机质中的氮素供给植物吸收利用；根系分泌物中的生物硝化抑制剂能抑制土壤硝化作用，减少氮素的淋溶；根系分泌物还通过控制根际与氮转化相关的反硝化细菌群落来促进土壤反硝化作用。综上，植物通过增加根系分泌物的输入能提高地下碳分配，影响根际土壤氮素转化，在维持森林土壤氮素循环和缓解养分限制等方面具有重要作用。表2参70
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| 关 键 词： | 根系分泌物 氮 森林土壤 矿化 初级生产力 |
| 收稿时间： | 2021-04-16 |
Effect of simulated root exudates input on soil nitrogen transformation: a review |
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| CAI Yinmei,ZHANG Chengfu,ZHAO Qingxia,LI Xinying,HE Tengbing.Effect of simulated root exudates input on soil nitrogen transformation: a review[J].Journal of Zhejiang A&F University,2021,38(5):916-925. |
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| Authors: | CAI Yinmei ZHANG Chengfu ZHAO Qingxia LI Xinying HE Tengbing |
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| Affiliation: | 1.College of Agriculture, Guizhou University, Guiyang 550025, Guizhou, China2.Institute of New Rural Development, Guizhou University, Guiyang 550025, Guizhou, China |
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| Abstract: | Global climate change accelerates plant growth and biomass accumulation, and nitrogen has become one of main limiting factors for primary productivity in forest ecosystems. The microbial process mediated by root exudates in rhizosphere is of great significance in driving soil nutrient cycle and increasing nitrogen availability. This study reviewed the effects and mechanisms of simulated root exudates input on soil nitrogen mineralization, nitrification, and denitrification. It was found that organic acids, sugars, and amino acids in root exudates accelerated the decomposition of organic matter and nitrogen mineralization, which partly alleviated the demand of plants for nitrogen. Root exudates inputs with different carbon content and C/N ratio drove rhizosphere microorganisms to exercise different nutrient utilization strategies. Through biological and abiotic effects, root exudates mineralized nitrogen in organic matter and supplied it to plants for absorption and utilization. Biological nitrification inhibitors in root exudates inhibited soil nitrification and reduced nitrogen leaching. Root exudates also promoted soil denitrification by controlling the denitrifying bacterial community in the rhizosphere. In conclusion, plants can improve underground carbon distribution and affect nitrogen transformation in rhizosphere soil by increasing the input of root exudates, which is vital for maintaining nitrogen cycle and alleviating nutrient limitation. Ch, 2 tab. 70 ref.] |
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