壳聚糖预处理对沉水植物黑藻生长的影响

以黑藻为例，研究了壳聚糖对沉水植物黑藻生长的影响，随机选取了经驯化培养后的黑藻顶枝，分别植入壳聚糖浓度为0％、0．05％、0．1％和0．2％的Hogland溶液中，进行生长实验，结果显示壳聚糖能促进黑藻生长，增加株高和湿重，同时能促进根的生长，并且以0．1％浓度的壳聚糖培养液效果最好，壳聚糖还能促进叶绿素的合成，并且0．05％、0．1％浓度的效果较好．另将经不同浓度壳聚糖预处理后的植株置于黑白瓶中，进行了壳聚糖影响黑藻光合能力的实验，结果显示经0．1％浓度的壳聚糖预处理24h后，能显著提高总产氧量和净产氧量。总之，用适宜浓度的壳聚糖溶液培养或对沉水植物黑藻进行预处理，能促进植株和根的生长发育，增加植株的光合能力，促进叶绿素的合成，提示在进行湖泊生态修复过程中，可利用适宜浓度的壳聚糖进行育苗，适当加快沉水植物育苗周期，提高湖泊沉水植物恢复的效率和效果。

Effects of Chitosan on Growth of Hydrilla Verticillata

The effects of chitosan on growth of Hydrilla Verticillata were studied. The tip of the hydrilla verticillata were chosen and planted in the Hogland with 0%,0.05%,0.1% and 0.2% chitosan. It shows that the Hogland culture with 0.1% chitosan can promote the growth of the hydrilla verticillata, increase the height, wet weight and the length of the root after ten days. The biomass of chlorophyll can be improved significantly in the Hogland with 0.05% or 0.1% chitosan. The result of the influence of different chitosan on photosynthesis shows that the total and net photosynthetic rate can be promoted by the treatment of 0.1% chitosan in 24 hours. It notifies that we can raise the young plant by appropriate concentration of chitosan, shorten the period of breeding, then improve the efficiency and effect of the submerged plant restoration in lakes.