Chlorophyll, primary productivity, and respiration in a lowland Costa Rican stream
Chlorophyll, primary productivity, and respiration in a lowland Costa Rican stream
复制标题
哥斯达黎加低地溪流中的叶绿素、初级生产力和呼吸
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
C. Goldman
中科院分区：
文献类型：
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作者：
P. Paaby;C. Goldman
在哥斯达黎加北部一条排干原始雨林和废弃牧场的三级溪流的开阔和封闭林冠上进行了原位营养物质富集性生物测定。人工砂+添加氮、磷、氮+磷、钼、氮+钼以及锰、锌、钼混合物的琼脂基质分别培养15天和21天。与开阔的牧场(14~45 mg叶绿素a m-2)相比，林木溪流中的定植附生植物(4 mlCholoph：11a m~(-2))在定殖15天后表现出极强的光照限制。叶绿素a浓度、氧的产生和消耗以及同化率没有表现出显著的营养添加效应，表明环境中的营养物质浓度对于附生植物的生长处于饱和水平。10~15日龄的周藻是自养的(P！R>；L)。最近。与其他热带溪流相比，该溪流的初级生产力[300mg02m-2 h-L]和呼吸速率(70mg02m-2 h-L)较低。
In situ nutrient enrichrnent bioassays were conducted in open and closed canopy sites of a third order stream draining primary rain forest and abandoned pasture land in northern Costa Rica. Artificial sand+agar substrata spiked with nitrogen, phosphorus, N+P, molybdenum, N+Mo, and a mix of manganese, zinc, and molybdenum were incubated for 15 and 21 days. The colonizing periphyton in the forested streamsites (4 mi chloroph:lll a m"2) showed extreme light limitation when compared with the open, pasture areas (14-45 mg chlorophyll a m- ) after 15 days of colonization. Chlorophyll a concentrations, oxygen production and consumption, and assimilation ratios did not show a significant nutrient addition effect indicating that ambient nutrient concentrations are at saturation levels for periphyton growth. Ten-to-fifteen day old periphyton was autotrophic (P!R>l) on al! trealrnents. Compared with other tropical streams, similar chlofophyll but lower Tates of primary productivity «300 mg 02 m-2 h-l) and respiration (70 mg 02 m-2 h-l) occurred in this stream.