Experimental evidence that water-exchange unevenness affects individual characteristics of two wetland macrophytes Phalaris arundinacea and Polygonum hydropiper
Experimental evidence that water-exchange unevenness affects individual characteristics of two wetland macrophytes Phalaris arundinacea and Polygonum hydropiper
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水交换不均匀性影响两种湿地植物蓼和水蓼个体特征的实验证据
DOI：
10.1016/j.ecolind.2019.105617
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发表时间：
2019-12
影响因子：
6.9
通讯作者：
Sun Shu-cun
中科院分区：
文献类型：
--
作者：
Pan Ying;Jin Ling;Wei Zhi-Hong;Yang Si-kun;Qian Ling;Liu Chang-e;Duan Chang-qun;Sun Shu-cun
水交换不均匀性（WEU）是指水交换率的时间变化，可以用水交换率随时间的变化系数来表征。虽然西西欧被认为是一个重要的水文特征，但对其对水生生态系统的影响知之甚少。本文通过两项室内实验，测试了低浓铀对1)无植物情况下环境条件的影响，以及2)有两种湿地大型植物——黄花蝴蝶兰（phalaris arundinaceae）和蓼（polygonum hydropiper）的环境条件和植物生长的影响。两个实验均采用双因素析因设计，包括WEU（低、中、高不均匀度）和埋深（0和5 cm）。与水体浊度、pH和溶解二氧化碳浓度相比，溶解氧浓度对WEU的敏感性最高，无论有无植物，溶解氧浓度都随着WEU的增加而显著降低。沉积物的氧化还原电位（ORP）、硝态氮（NO3-N）、全氮、速效磷和全磷均随WEU的增加而下降，与埋深和有无植物无关。埋深导致土壤ORP进一步降低。生物量积累随WEU和埋深的增加而减少。此外，植物根系短而粗，根醇脱氢酶活性增加，但根质量比降低，这可能是由于植物在较高的WEU水平和/或较深的埋藏条件下适应了厌氧胁迫。然而，在较深的埋藏条件下，由于养分吸收能力有限，WEU的增加通常不会导致根系进一步调整。结果表明，磷处理使植物生物量减少了49.82%。p的比例为76.94%。与0 cm埋深处的39.68%和45.71%相比，5 cm埋深处的WEU水平由低到高。综上所述，我们的研究结果表明，西欧通过调节氧气和养分的有效性，对湿地大型植物的性能产生了强烈的影响。考虑到人为干扰和气候变化正在显著改变湖泊生态系统的西欧，我们呼吁对这一水文要素进行更多的研究，以评估其潜在的生态影响。
Water-exchange unevenness (WEU) is the temporal variation in water exchange rate that can be characterized by the coefficient of variation of water exchange rates across time. Although WEU is recognized as an important hydrological feature, little is known about its effects on aquatic ecosystems. Herein, two laboratory experiments were conducted to test the effects of WEU on 1) environmental conditions in the absence of plants, and 2) both environmental conditions and plant growth in the presence of two wetland macrophytesPhalaris arundinaceaandPolygonum hydropiper. A two-factor factorial design comprising WEU (low-, intermediate-, and high-level of unevenness) and burial depth (0 and 5 cm) was used for both experiments.Compared to turbidity, pH, and dissolved carbon dioxide concentration of the waterbody, dissolved oxygen concentration showed the highest sensitivity to WEU, which decreased significantly with increasing WEU regardless of the absence or presence of plants. For the sediment, oxidation-reduction potential (ORP), NO3-N, total N, available P, and total P decreased consistently with increasing WEU, regardless of burial depth and the absence or presence of plants. Furthermore, deeper burial led to further decreases in soil ORP for all three WEU levels.Biomass accumulation decreased with increasing WEU and burial depth in both plant species. Additionally, plants developed shorter and thicker roots, and the root alcohol dehydrogenase activity increased, but there was a decrease in the root mass ratio, likely due to the plants adapting to anaerobic stress under higher WEU levels and/or deeper burial conditions. However, under deeper burial conditions, increased WEU generally did not lead to further root adjustments due to the limited nutrient absorption capacity. Consequently, plant biomass decreased by 49.82% forP. arundinaceaand 76.94% forP. hydropiperfrom low to high WEU levels at 5 cm burial depth compared to values of 39.68% and 45.71% at 0 cm burial depth, respectively.Overall, our results demonstrated that WEU strongly influences the performances of wetland macrophytes through modulation of oxygen and nutrient availability. Considering that anthropogenic disturbance and climate change are markedly altering the WEU of lake ecosystems, we call for more research into this hydrological element to assess its potential ecological impacts.
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影响因子：
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作者：
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DOI：
10.2136/sssaj1965.03615995002900060025x
发表时间：
1965-11
影响因子：
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作者：
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