Earth system models predict large increases in global terrestrial net primary productivity (NPP) over the next century, largely reflecting positive effects of climate change and increasing atmospheric carbon dioxide concentrations on plant growth. However, while theory predicts that soil phosphorus (P) availability may keep pace with P demand as the climate warms, we lack experimental evidence to support this prediction. Here, using a set of laboratory experiments and incubations, we measured both the effect of temperature on the mechanism of biochemical P mineralization—phosphatase (Ptase) enzyme activities—and on rates of soil P mineralization in soils from a range of ecosystem types from the tropics to the Arctic. Consistent with temperature effects on soil nitrogen (N) mineralization, we found that both Ptase activities and P availability in soil increased with temperature following macromolecular rate theory (MMRT) based kinetics. However, across all sites and temperatures, there was no relationship between Ptase activity and mineralized P, indicating that the potential responses of P mineralization with warming vary among ecosystems. The lack of relationship between Ptase and P availability with increasing temperature is consistent with previous work showing that P mineralization rates are also strongly affected by other biotic and abiotic factors, including organic P substrate availability and the geochemical properties of soil. However, our results indicate that the use of Ptase temperature kinetics alone as a proxy for soil P mineralization in terrestrial ecosystems is insufficient to predict future P availability accurately, and modeling efforts that do so will likely overestimate the effects of temperature on soil P availability.

中文翻译：

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温度对土壤磷有效性和磷酸酶活性的影响：从热带到北极的跨生态系统研究

地球系统模型预测，下个世纪全球陆地净初级生产力 (NPP) 将大幅增加，这在很大程度上反映了气候变化和大气二氧化碳浓度增加对植物生长的积极影响。然而，虽然理论预测随着气候变暖，土壤磷 (P) 可用性可能与磷需求保持同步，但我们缺乏实验证据来支持这一预测。在这里，我们使用一组实验室实验和孵化，测量了温度对生化 P 矿化机制——磷酸酶 (Ptase) 酶活性的影响——以及对一系列生态系统类型土壤中土壤 P 矿化速率的影响。热带到北极。与温度对土壤氮 (N) 矿化的影响一致，我们发现，根据基于大分子速率理论 (MMRT) 的动力学，土壤中的 Ptase 活性和 P 有效性都随着温度而增加。然而，在所有地点和温度下，Ptase 活性与矿化 P 之间没有关系，表明 P 矿化对变暖的潜在响应因生态系统而异。Ptase 和 P 可用性与温度升高之间缺乏关系与先前的工作一致，表明 P 矿化速率也受到其他生物和非生物因素的强烈影响，包括有机 P 底物的可用性和土壤的地球化学特性。然而，