Responses of Ulva prolifera to short-term nutrient enrichment under light and dark conditions
Responses of Ulva prolifera to short-term nutrient enrichment under light and dark conditions
复制标题
DOI：
10.1016/j.ecss.2015.03.018
复制
发表时间：
2015-09
影响因子：
2.8
通讯作者：
Kai Sun;Ruixiang Li;Yan Li;M. Xin;Jie-yi Xiao;Zongling Wang;Xue-Xi Tang;Min Pang
中科院分区：
文献类型：
--
作者：
Kai Sun;Ruixiang Li;Yan Li;M. Xin;Jie-yi Xiao;Zongling Wang;Xue-Xi Tang;Min Pang
为了确定短期营养吸收inUlva prolifera的反应，我们测量了吸收率，酶活性和组织营养含量在实验室实验中，我们操纵营养供应和照射。硝态氮的吸收受外界硝态氮浓度的影响显著，而铵态氮的吸收主要取决于光的有效性。各组织中氮含量的测定值均高于利用可溶性无机氮的计算值，表明增殖型微囊藻可能利用多种氮源。高浓度的外源磷和充足的光照能促进增殖裸藻对磷的吸收，但组织中磷含量的测定值低于磷吸收计算值，提示增殖裸藻有内源磷释放的可能。硝酸还原酶（NR）、酸性磷酸酶（AcP）和碱性磷酸酶（AP）活性变化不大，表明酶活性可能不是决定增殖裸藻短期养分吸收的直接因素。
To define responses of short-term nutrient uptake inUlva prolifera, we measured uptake rates, enzyme activity, and tissue nutrient content in lab experiments where we manipulated nutrient supply and irradiation. Nitrate uptake ofU. proliferawas significantly impacted by the external nitrate concentrations, and ammonium uptake was mainly determined by the light availability. The measured nitrogen contents in tissues were higher than the calculated values from the uptake of dissolve inorganic nitrogen, indicating thatU. proliferamight use multiple nitrogen sources. High external phosphate concentrations and sufficient light can accelerate the phosphate uptake ofU. prolifera, while the measured phosphorus contents in tissues were lower than the calculated values from the uptake of phosphate, suggesting a possibility of internal phosphorus release. The enzymatic activities of nitrate reductase (NR), acid phosphatase (AcP) and alkaline phosphatase (AP) showed little changes, indicating that enzymatic activity might not a direct factor determining the short-term nutrient uptake ofU. prolifera.