Response of soil phosphorus fractions and fluxes to different vegetation restoration types in a subtropical mountain ecosystem
Response of soil phosphorus fractions and fluxes to different vegetation restoration types in a subtropical mountain ecosystem
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亚热带山地生态系统土壤磷组分和通量对不同植被恢复类型的响应
DOI：
10.1016/j.catena.2020.104663
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发表时间：
2020-10-01
期刊：
影响因子：
6.2
通讯作者：
Jones, Davey L.
中科院分区：
文献类型：
--
作者：
Fu, Denggao;Wu, Xiaoni;Jones, Davey L.
土壤磷（P）含量的提高是植被恢复的重要目标之一。然而，不同植被恢复类型对土壤磷循环的影响及其潜在机制仍不清楚。我们结合植被结构和土壤特性，测定了土壤磷组分和磷转化率，以评估亚热带山地生态系统中最常见的植被恢复类型（即松林（PF）、桉树林（EF）、灌丛（SL）和天然次生林（NSF））的具有生态相关性的土壤磷组分分布特征及其动态。我们发现，天然次生林中可水提取的无机磷（P - i）、有机磷（P - o）和酸性磷酸酶活性（APA）显著高于其他植被类型（P < 0.01），总磷矿化率（P - min）和净磷固定率（P - imm）也最高，这表明生物过程在天然次生林的土壤磷循环中起着更重要的作用。相比之下，与天然次生林和松林相比，桉树林土壤的Pmin、Pimm和APA值最低（P < 0.05），磷损失最高且净磷溶解率（Psol）较高，这表明土壤地球化学过程更为重要。与天然次生林和桉树林相比，地球化学和生物过程共同调节松林和灌丛中的土壤磷循环。然而，松林土壤的磷通量（P - min、P - imm、P - sol和磷损失）高于灌丛（P < 0.05），这表明松林土壤的磷通量幅度更高。相关性分析结果表明，在土壤磷组分分布和通量方面，土壤微生物群落结构和活性比植物群落属性和土壤理化性质起着更重要的作用。总之，植被恢复类型可显著影响土壤磷组分分布及其通量。注重恢复土壤微生物群落的土地管理策略可能会增强土壤磷循环并改善土壤质量。
Soil phosphorus (P) improvement is one of the important aims of vegetation restoration. However, the effects of different vegetation restoration types on soil P cycling and the underlying mechanisms remain unclear. Together with vegetation structure and soil properties, we measured the soil P fractions and P transformation rates to evaluate the characteristics of ecologically relevant soil P fraction distributions and their dynamics for the most common vegetation restoration types in a subtropical mountain ecosystem (i.e., PF, Pinus forest; EF, Eucalyptus forest; SL, shrubland; and NSF, natural secondary forest). We found that water-extractable inorganic P (P-i), organic P (P-o), and acid phosphatase activity (APA) were significantly higher in NSF than those in the other vegetation types (P < 0.01), together with the highest gross P mineralization rate (P-min) and net P immobilization rate (P-imm), suggesting biological processes played a more important role in soil P cycling in the NSF. In contrast, the soil showed the lowest values of Pmin, Pimm, and APA in the EF compared to NSF and PF (P < 0.05), together with the highest P loss and the higher net P solubilization rate (Psol), indicating the greater importance of soil geochemical processes. Compared with the NSF and EF, geochemical and biological processes co-regulated soil P cycling in the PF and SL. However, the soil in the PF displayed higher P fluxes (P-min, P-imm, P-sol, and P loss) than those in the SL (P < 0.05), suggesting the soil had higher P flux magnitudes in the PF. Results of correlation analyses showed that the soil microbial community structure and activity played a more important role than plant community attributes and soil physicochemical properties in soil P fraction distribution and fluxes. In conclusion, soil P fraction distributions and their fluxes can be significantly influenced by vegetation restoration types. Land management strategies focusing on restoration of the soil microbial community may enhance soil P cycling and improve soil quality.