Introduction of Dalbergia odorifera enhances nitrogen absorption on Eucalyptus through stimulating microbially mediated soil nitrogen-cycling
Introduction of Dalbergia odorifera enhances nitrogen absorption on Eucalyptus through stimulating microbially mediated soil nitrogen-cycling
复制标题
引入降香黄檀通过刺激微生物介导的土壤氮循环来增强桉树的氮吸收
DOI：
10.1186/s40663-021-00339-3
复制
发表时间：
2021-09
影响因子：
4.1
通讯作者：
Deng Qi
中科院分区：
文献类型：
--
作者：
Yao Xianyu;Zhang Qianchun;Zhou Haiju;Nong Zhi;Ye Shaoming;Deng Qi
背景
有大量证据表明，桉树通过引入固氮物种可以吸收氮素并增加生长，但微生物介导的土壤氮素循环的潜在机制尚不清楚。
方法
研究了广西壮族自治区尾叶桉纯林(PP)和降香桉混交林(MP)的土壤pH、土壤水分、土壤有机碳、全N(TN)、无机N(NH_4+-N和NO_3-−-N)、微生物量和3种N降解酶活性以及生物量和N生产力的变化。
结果
与PP站相比，MP站两个季节的土壤pH、SWC、SOC和TN均显著高于PP站，从而提高了微生物生物量和土壤N降解酶的活性。MP土壤微生物活性的增强可能加速了土壤N的矿化，为桉树吸收提供了更多的有效N(两季均为NH_4+-N，湿热季节为NO_3-−-N)。总体而言，MP立地桉树的氮素生产力提高了19.7%和21.9%，其中干冷季和湿热季的生物量分别提高了15.1%和19.2%。
结论
这些结果揭示了微生物介导的土壤氮素循环在桉树氮素吸收中的重要性。桉树引种可提高桉树生物量和氮素生产力，改善土壤氮素有效性，提高土壤C、N浓度，是桉树人工林可持续经营的有效选择。
Background
There is substantial evidence that Eucalyptus for nitrogen (N) absorption and increasing the growth benefit from the introduction of N-fixing species, but the underlying mechanisms for microbially mediated soil N cycling remains unclear.
Methods
We investigated the changes of soil pH, soil water content (SWC), soil organic carbon (SOC), total N (TN), inorganic N (NH4+-N and NO3−-N), microbial biomass and three N-degrading enzyme activities as well as the biomass and N productivity of Eucalyptus between a pure Eucalyptus urophylla × grandis plantation (PP) and a mixed Dalbergia odorifera and Eucalyptus plantation (MP) in Guangxi Zhuang Autonomous Region, China.
Results
Compared with the PP site, soil pH, SWC, SOC and TN in both seasons were significantly higher at the MP site, which in turn enhanced microbial biomass and the activities of soil N-degrading enzymes. The stimulated microbial activity at the MP site likely accelerate soil N mineralization, providing more available N (NH4+-N in both seasons and NO3−-N in the wet-hot season) for Eucalyptus absorption. Overall, the N productivity of Eucalyptus at the MP site was increased by 19.7% and 21.9%, promoting the biomass increases of 15.1% and 19.2% in the dry-cold season and wet-hot season, respectively.
Conclusion
Our results reveal the importance of microbially mediated soil N cycling in the N absorption on Eucalyptus. Introduction of D. odorifera enhances Eucalyptus biomass and N productivity, improve soil N availability and increased soil C and N concentration, which hence can be considered to be an effective sustainable management option of Eucalyptus plantations.
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DOI：
10.1002/9781118337295.ch4
发表时间：
2013
期刊：
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影响因子：
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作者：
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