纳米摩尔磷酸盐供应及其再循环驱动了亚热带北太平洋的净群落生产。

Nanomolar phosphate supply and its recycling drive net community production in the subtropical North Pacific.

机构信息

Department of Ocean Sciences, Tokyo University of Marine Science and Technology, Tokyo, Japan.

Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Australia.

出版信息

Nat Commun. 2021 Jun 8;12(1):3462. doi: 10.1038/s41467-021-23837-y.

DOI:10.1038/s41467-021-23837-y

PMID:34103533

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8187552/

Abstract

Seasonal drawdown of dissolved inorganic carbon (DIC) in the subtropical upper ocean makes a significant contribution to net community production (NCP) globally. Although NCP requires macronutrient supply, surface macronutrients are chronically depleted, and their supply has been unable to balance the NCP demand. Here, we report nanomolar increases in surface nitrate plus nitrite (N+N, 20 nM) and phosphate (PO, ~15 nM) from summer to winter in the western subtropical North Pacific. Molar ratios of upward fluxes of DIC:N+N:PO to the euphotic zone (< 100 m) were in near-stoichiometric balance with microbial C:N:P ratios (107243:16~~35:1). Comparison of these upward influxes with other atmospheric and marine sources demonstrated that total supply is largely driven by the other sources for C and N (93~~96%), but not for P (10%), suggesting that nanomolar upward supply of P and its preferential recycling play a vital role in sustaining the NCP.

摘要

季节导致的亚热带上层海洋溶解无机碳（DIC）亏缺对全球净初级生产力（NCP）有重要贡献。尽管 NCP 需要大量营养物质的供应，但表层大量营养物质长期匮乏，其供应无法平衡 NCP 的需求。在这里，我们报告了西北太平洋亚热带从夏季到冬季表层硝酸盐加亚硝酸盐（N+N，约 20 nM）和磷酸盐（PO，约 15 nM）浓度的纳米级增加。DIC:N+N:PO 向上通量与真光层（<100 m）的摩尔比与微生物 C:N:P 比（107~~243:16~~35:1）接近化学计量平衡。将这些向上通量与其他大气和海洋来源进行比较表明，总供应主要受其他 C 和 N 来源驱动（93~96%），但不受 P 来源驱动（10%），这表明 P 的纳米级向上供应及其优先回收在维持 NCP 方面发挥了至关重要的作用。