{"refrec":{"BRefID":112086,"RR":"<b>Xie, Y.; An, S.; Yao, X.; Xiao, K.; Zhang, C.</b> (2005). Short-time response in root morphology of <i>Vallisneria natans</i> to sediment type and water-column nutrient. <i>Aquat. Bot. 81(1)</i>: 85-96. <a href=\"https://dx.doi.org/10.1016/j.aquabot.2004.12.001\" target=\"_blank\">https://dx.doi.org/10.1016/j.aquabot.2004.12.001</a>","BEntID":106677,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>Aquat. Bot. 81(1)</i>: 85-96. <a href=\"https://dx.doi.org/10.1016/j.aquabot.2004.12.001\" target=\"_blank\">https://dx.doi.org/10.1016/j.aquabot.2004.12.001</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Xie, Y.; An, S.; Yao, X.; Xiao, K.; Zhang, C.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Xie, Y. <i>et al.</i>","Englishabstract":"Rooted submerged macrophytes can absorb significant amounts of nutrients from both sediment and water. We investigated root morphology of <i>Vallisneria natans</i> in mesocosm plastic bins, in response to three types of sediment (sandy loam, clay, and a 50:50 (v/v) mixture of the two sediments) and two levels of water-column nutrient (well water and nutrient medium). Compared to the plants grown in the clay or mixed sediments, root diameter decreased (0.39-0.41 versus 0.36-0.37 mm) but total root length per plant increased (0.87-1.27 versus 1.14-1.62 m) when grown in sandy loam. Increase of nutrient availability in water column led to decreased specific root length (306-339 versus 258-281 m g-<sup>1</sup>). However, both sediment type and water-column nutrient had no impacts on root number (ranged from 19 to 24 number of roots per plant). Root weight ratio, root:leaf mass ratio and root:leaf length ratio generally decreased with enhanced nutrient availability in sediment or water. Plant growth was affected by sediment type alone (P < 0.05), rather than water-column nutrient (P > 0.05). However, plant N and P contents were significantly impacted by both sediment type (P  ≤ 0.001) and water-column nutrient (P < 0.05). Increase of nutrient availability in sediment or water led to increased plant N (ranged from 2.47 to 4.77 mg g-<sup>1</sup>) and P concentrations (ranged from 42.8 to 62.0 mg g<sup>-1</sup>). These results indicate that considerable variation in root morphology of <i>V. natans </i>exists in response to the fertility of the sediment it is rooted in. 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