The Relationship of Bioturbation, Macrobenthos and Seabed Radionuclides to the Flux and Fate of Organic Carbon Along the JGOFS Equatorial Pacific Transect

1991-1992年，美国JGOFS赤道太平洋项目将研究140oW的跨赤道样带有机碳的产生、通量和归宿。从赤道向北，这条横断面穿越了颗粒有机碳通量和深海海底埋藏的陡峭梯度。为了阐明这些沉积物中有机碳的命运，了解生物扰动和海底粒子动力学（通过自然发生的放射性核素追踪）是必不可少的。侦探他提议沿着碳通量梯度测试四种具有生物化学意义的假设：(1)生物扰动率和深度随年颗粒有机碳（POC）通量的变化而变化，(2)这些变化对海底有机碳的矿化和埋藏有显著影响，(3)大型底栖动物的生长作物和平均体型与年POC通量相关，(4)海底过剩储量234。th和210Pb分别在100 d、10年和100年的时间尺度上与POC通量相关。

In 1991-1992, the US JGOFS Equatorial Pacific program will study the production, flux and fate of organic carbon along a cross-equatorial transect at 140oW. From the equator northward, this transect traverses a steep gradient in particulate organic-carbon flux and burial at the abyssal seafloor. In order to elucidate the fate of organic carbon in these sediments, an understanding of bioturbation and seabed particle dynamics (as traced by naturally occurring radionuclides) is essential. The P.I.'s propose to test, along this carbon-flux gradient, four hypotheses of biogoechemical significance: (1) bioturbation rates and depths vary with annual particulate organic-carbon (POC) flux to the seafloor, (2) these variations have a significant impact on the mineralization and burial of organic carbon in the seabed, (3) macrobenthic standing crop and mean body size are correlated with annual POC flux, and (4) seabed inventories of excess 234Th, 228Th and 210Pb are correlated with POC flux on 100-d, 10-yr and 100-yr time scales, respectively.