Biochar application under low phosphorus input promotes soil organic phosphorus mineralization by shifting bacterial phoD gene community composition.
Biochar application under low phosphorus input promotes soil organic phosphorus mineralization by shifting bacterial phoD gene community composition.
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低磷输入下生物炭的应用通过改变细菌 phoD 基因群落组成促进土壤有机磷矿化。
DOI：
10.1016/j.scitotenv.2021.146556
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发表时间：
2021-07
影响因子：
9.8
通讯作者：
Cai Kunzheng
中科院分区：
文献类型：
--
作者：
Tian Jihui;Kuang Xizhi;Tang Mengtian;Chen Xiaodong;Huang Fei;Cai Yixia;Cai Kunzheng
生物炭具有增强土壤微生物介导的磷循环的潜力，但其潜在机制尚不清楚。我们假设，生物炭修正案可以提高生产的酸性和碱性磷酸单酯酶，磷酸二酯酶和磷矿化，这可能会有所不同，这取决于磷输入。为了验证这一假设，我们评估了在不同的磷输入率（0，30和90 kg P ha−1）下稻草生物炭施用量（0和4%）对酸性土壤中磷组分，磷酸酶活性和碱性磷酸单酯酶编码细菌（phoDgene）群落之间关系的影响。在低磷输入（< 30 kg P ha−1）条件下，生物炭的施用显著增加了磷酸二酯酶和碱性磷酸单酯酶的活性，但对酸性磷酸单酯酶和有机磷的耗竭没有显著影响。碱性磷酸单酯酶活性的增加是不相关的inphoDgene丰度的增加，但由于社区组成的转变，这主要是由土壤C：P比驱动。微生物网络分析表明，在低磷输入下，生物炭的施用比在高磷输入下具有更复杂的phoDgene群落，具有更多的功能相关的群体。此外，在富碳和贫磷条件下，小单孢菌的特异性富集可能在碱性磷酸单酯酶的产生和潜在的磷矿化中起关键作用。总之，我们表明，低磷输入下的生物炭应用支持一个更organizedphoDgene社区和优先丰富的类群在他们的能力P矿化，这反过来又可能提高P的生物利用度和植物P的收购。
Biochar has the potential to enhance microbial-mediated phosphorus (P) cycling in soils, but the underlying mechanisms remain largely unknown. We hypothesized that biochar amendment could enhance the production of acid and alkaline phosphomonoesterase, phosphodiesterase and P mineralization, which may vary depending on the P input. To test this hypothesis, we assessed the impacts of rice straw biochar application (0 and 4%) under different P-input rates (0, 30 and 90 kg P ha−1) on the relationships among P fractions, phosphatase activities and alkaline phosphomonoesterase-encoding bacterial (phoDgene) communities in an acidic soil. Biochar application under low P input (< 30 kg P ha−1) significantly increased the activities of phosphodiesterase and alkaline phosphomonoesterase but not that of acid phosphomonoesterase and depleted organic P. The results from the structural equation model revealed a dominant role of alkaline phosphomonoesterase in P mineralization. The increase in alkaline phosphomonoesterase activity was not related to an increase inphoDgene abundance but was due to a shift in community composition, which was primarily driven by the soil C:P ratio. Microbial network analysis demonstrated a more complexphoDgene community with more functionally interrelated groups as a result of biochar application under low P input than under high P input. Moreover, the specific enrichment ofMicromonosporaceaeunder C-rich and P-poor conditions may play a critical role in alkaline phosphomonoesterase production and potential P mineralization. In conclusion, we demonstrated that biochar application under low P input supports a more organizedphoDgene community and preferentially enriches taxa in terms of their capacity for P mineralization, which in turn may enhance P bioavailability and plant P acquisition.
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