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首页> 外文期刊>Marine ecology >Long-term nitrogen and phosphorus fertilization effects on N_2 fixation rates and nifH gene community patterns in mangrove sediments
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Long-term nitrogen and phosphorus fertilization effects on N_2 fixation rates and nifH gene community patterns in mangrove sediments

机译：长期施氮和磷对红树林沉积物中N_2固着率和nifH基因群落格局的影响

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摘要

The bioavailability of nutrients is important in controlling ecological processes and nitrogen cycling in oligotrophic mangrove forests, yet the variation of diazotrophic community structure and activity with nutrient availability in sediments remains largely unexplored. To investigate for the first time how nutrients in sediments affect spatial and temporal patterns of diazotrophic community structure and activity, the sedimentary environment of Twin Cays, Belize, was examined with respect to the effects of long-term fertilization [treatments: control (Ctrl), nitrogen (N), and phosphorus (P)] on N_2 fixation rates and nifH gene community structure. We found that N_2 fixation rates were significantly higher at the P-treatment, intermediate at the Ctrl-treatment and lower in the N-treatment (P: 4.2 ± 0.5, Crtl: 0.8 ± 0.1, N: 0.4 ± 0.1 nmol·N· g~(-1)·h~(-1); P < 0.001) with spatial (Ctrl- and P-treatments) and temporal (only P-treatment) variability positively correlated with live root abundance (r~2 = 0.473, P < 0.001) and PO_4~(3-) concentration (r~2 = 0.458, P < 0.0001). The community structure of diazotrophs showed larger spatial and temporal variability in the fertilized treatments than in the Ctrl-treatment, with the relative abundance of OTUs (nifH operational taxonomic units) at the fertilized treatments inversely related to live root abundance. Overall, long-term fertilization (with either N or P) affects not only nutrient levels in mangrove sediments directly, but also spatial and temporal patterns of both community structure and activity and likely plant-microbe interactions as well. Our findings suggest that the maintenance of natural nutrient conditions in mangrove sediments is important to ensure the stability of microbial functional groups like diazotrophs.
机译：养分的生物利用度对于控制贫营养性红树林的生态过程和氮循环很重要，但是重氮养分群落结构和活性随养分中养分的变化而变化还很大。为了首次研究沉积物中的养分如何影响重氮营养群落结构和活动的时空格局，就长期施肥的影响，对伯利兹双子岛的沉积环境进行了研究[处理：对照（​​Ctrl） ，氮（N）和磷（P）]对N_2固定率和nifH基因群落结构的影响。我们发现，P处理的N_2固定率显着较高，而Ctrl处理的则为中等，而N处理的固定率较低（P：4.2±0.5，Crtl：0.8±0.1，N：0.4±0.1 nmol·N· g〜（-1）·h〜（-1）； P <0.001），空间（Ctrl和P处理）和时间（仅P处理）变异与活根丰度正相关（r〜2 = 0.473， P <0.001）和PO_4〜（3-）浓度（r〜2 = 0.458，P <0.0001）。与施肥处理相比，重氮营养菌的群落结构在空间和时间上表现出更大的变化，施肥处理中OTU的相对丰度（nifH操作分类单位）与活根丰度成反比。总体而言，长期施肥（含氮或磷）不仅直接影响红树林沉积物中的养分水平，而且还影响群落结构和活动以及植物与微生物之间的相互作用的时空格局。我们的发现表明，维持红树林沉积物中的自然营养条件对于确保微生物功能团（如重氮营养菌）的稳定性很重要。

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