Enhanced rock weathering (ERW) has been proposed as a measure to enhance the carbon (C)‐sequestration potential and fertility of soils. The effects of this practice on the soil phosphorus (P) pools and the general mechanisms affecting microbial P cycling, as well as plant P uptake are not well understood. Here, the impact of ERW on soil P availability and microbial P cycling functional groups and root P‐acquisition traits were explored through a 2‐year wollastonite field addition experiment in a tropical rubber plantation. The results show that ERW significantly increased soil microbial carbon‐use efficiency and total P concentrations and indirectly increased soil P availability by enhancing organic P mobilization and mineralization of rhizosheath carboxylates and phosphatase, respectively. Also, ERW stimulated the activities of P‐solubilizing (gcd, ppa and ppx) and mineralizing enzymes (phoADN and phnAPHLFXIM), thus contributing to the inorganic P solubilization and organic P mineralization. Accompanying the increase in soil P availability, the P‐acquisition strategy of the rubber fine roots changed from do‐it‐yourself acquisition by roots to dependence on mycorrhizal collaboration and the release of root exudates. In addition, the direct effects of ERW on root P‐acquisition traits (such as root diameter, specific root length, and mycorrhizal colonization rate) may also be related to changes in the pattern of belowground carbon investments in plants. Our study provides a new insight that ERW increases carbon‐sequestration potential and P availability in tropical forests and profoundly affects belowground plant resource‐use strategies.

中文翻译：

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增强的岩石风化增加了土壤磷的有效性并改变了根系磷的获取策略


增强岩石风化（ERW）已被提议作为增强土壤碳（C）封存潜力和肥力的措施。这种做法对土壤磷 (P) 库的影响以及影响微生物磷循环以及植物磷吸收的一般机制尚不清楚。在此，通过在热带橡胶种植园进行为期 2 年的硅灰石田间添加实验，探讨了 ERW 对土壤磷有效性、微生物磷循环功能群和根系磷吸收性状的影响。结果表明，ERW显着提高了土壤微生物碳利用效率和总磷浓度，并分别通过增强有机磷动员和根鞘羧酸盐和磷酸酶的矿化间接增加了土壤磷的有效性。此外，ERW还刺激了溶磷酶（gcd、ppa和ppx）和矿化酶（phoADN和phnAPHLFXIM）的活性，从而有助于无机磷溶解和有机磷矿化。随着土壤有效磷的增加，橡胶细根的磷获取策略从根部自行获取磷转变为依赖菌根协作和根系分泌物的释放。此外，ERW对根部磷获取性状（如根直径、比根长度和菌根定殖率）的直接影响也可能与植物地下碳投资模式的变化有关。我们的研究提供了一个新的见解，即战争遗留爆炸物增加了热带森林的碳固存潜力和磷的可用性，并深刻影响地下植物资源利用策略。