Spatial and temporal variability of chlorophyll and primary productivity in surface waters of southern Chile (41.5–43° S)
Spatial and temporal variability of chlorophyll and primary productivity in surface waters of southern Chile (41.5–43° S)
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DOI：
10.1016/j.ecss.2007.05.015
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发表时间：
2007-09
影响因子：
2.8
通讯作者：
J. Iriarte;H. González;Kon‐Kee Liu;C. Rivas;C. Valenzuela
中科院分区：
文献类型：
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作者：
J. Iriarte;H. González;Kon‐Kee Liu;C. Rivas;C. Valenzuela
智利南部峡湾地区是一个独特的生态系统，其特点是复杂的海洋-陆地-大气相互作用导致生物产量高。由于来自陆地和大气的有机氮在该地区非常重要(>；40%)，以及地表水中较低的NO3/PO4比率，因此来自无机和有机氮源的施肥对浮游植物的生物量/初级生产力和有害藻类水华动态都有很大的影响。本文提供的数据为我们在时间和空间中尺度上提高对浮游植物动力学的认识提供了机会。美国国家航空航天局(SeaWiFS)对叶绿素和初级生产力估计的海洋颜色数据以及对无机营养物质、浮游植物生物量和初级生产力的现场表面测量表明，智利南部沿海水域具有典型的春季和秋季叶绿素水华周期，其中初级生产力受到光照和硝酸盐强烈季节变化的共同限制。在春季水华期间，自养生物量(如叶绿素a、Chl-a)和初级生产力估算分别达到25mgChl-am−3和23mgcm−3h−1，微型浮游植物在春季生物量中占相当大的比例(60%)。浮游植物大小对总叶绿素a的贡献表明，在冬季和水华后时期(<；1.0mgChl-am−3)，纳米浮游生物(>；50%)占主导地位。
The southern fjord region of Chile is a unique ecosystem characterized by complex marine–terrestrial–atmospheric interactions that result in high biological production. Since organic nitrogen from terrestrial and atmospheric compartments is highly significant in this region (>40%), as is the low NO3:PO4ratio in surface waters, it is suggested that fertilization from inorganic and organic nitrogen sources has a strong influence on both phytoplankton biomass/primary production and harmful algae bloom dynamics. The data presented in this paper provide an opportunity to improve our knowledge of phytoplankton dynamics on temporal and spatial mesoscales. Ocean color data from NASA (SeaWiFS) for chlorophyll and primary production estimates and in situ surface measurement of inorganic nutrients, phytoplankton biomass, and primary productivity revealed that the coastal waters of southern Chile have a classical spring and autumn chlorophyll bloom cycle in which primary production is co-limited by strong seasonal changes in light and nitrate. During spring blooms, autotrophic biomass (such as chlorophyll a, Chl-a) and primary production estimates reached 25mg Chl-am−3and 23mg Cm−3h−1, respectively, and micro-phytoplankton accounted for a significant portion of the biomass (60%) in spring. The contribution of phytoplankton size classes to total chlorophyll a revealed the dominance of nanoplankton (>50%) in winter and post-bloom periods (<1.0mg Chl-am−3).