Response of Vallisneria spinulosa (Hydrocharitaceae) to contrasting nitrogen loadings in controlled lake mesocosms

Response of Vallisneria spinulosa (Hydrocharitaceae) to contrasting nitrogen loadings in controlled lake mesocosms
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苦草(Hydrocharitaceae)对受控湖泊中生态系统氮负荷对比的响应

DOI:
10.1007/s10750-015-2456-1
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发表时间:
2016-02
期刊:
影响因子:
2.6
通讯作者:
Li Wei
Li Wei
中科院分区:
生物学3区
文献类型:
--
作者:
Zhao Suting;Yin Liyan;Chang Fengyi;Olsen Saara;Sondergaard Martin;Jeppesen Erik;Li Wei

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在浅水湖泊中,高浓度的氮在由水生植物为主的状态转变为植物浮游生物为主的状态中所起的作用仍有争议。为了阐明高氮对大型植物生长可能的毒性和生态效应,我们进行了一个短期(40天)的研究,富营养化耐受的大型植物,刺苦草(水charitaceae),培养在盆中的围隔系统受到不同的N浓度(1,3,和5毫克l−1)。随着施氮量的增加,植株叶长、根长和生长速率显著下降,但可溶性蛋白质含量、硝酸还原酶活性、酸性磷酸酶活性、组织氮磷含量等与氮磷相关的生理指标在施氮处理间差异不显著。只有碱性磷酸酶活性不同,在高氮负荷,可能是由于磷限制较低。随着氮负荷的增加,附生植物和浮游植物生物量显着增加。我们的研究结果,包括大量的大型水生植物的生理测试,因此,提供了支持的证据,沉水植物的损失,如V.刺,看到在高氮负荷在浅水湖泊,可以归因于与浮游植物和附生植物的竞争,而不是毒性效应。
The role of nitrogen (N) in the shift from a macrophyte-dominated state to a phytoplankton-dominated one at high N concentrations in shallow lakes is still debated. To elucidate possible toxic and ecological effects of high N on macrophyte growth, we conducted a short-term (40 day) study of a eutrophication-tolerant macrophyte, Vallisneria spinulosa (Hydrocharitaceae), incubated in pots in a mesocosm system subjected to different N concentrations (1, 3, and 5 mg l−1). Plant leaf and root length as well as growth rate decreased significantly with increased N concentrations, but most N- and P-related physiological parameters, including the soluble protein content, nitrate reductase activity, acid phosphatase activity, and tissue N and P contents, did not differ significantly among the N treatments. Only the alkaline phosphatase activity differed, being lower at high nitrogen loading, likely due to P limitation. Epiphyton and phytoplankton biomasses increased significantly with increasing N loading. Our results including a large number of physiological tests of the macrophytes, therefore, provide supporting evidence that the loss of submerged macrophytes, like V. spinulosa, seen at high N loading in shallow lakes, can be attributed to competition with phytoplankton and epiphyton rather than to toxic effects.
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