五里湖深水区沉水植被重建策略探索

本文以菹草(PotamogetoncrispusL.)和伊乐藻(Elodeanuttallii)为材料,在不同水深条件下对沉水植物的生长进行了研究。结果表明:随着水深的增加,菹草和伊乐藻的茎伸长速度逐渐增大,但分支数或株数减少,最终植物生物量减少;菹草和伊乐藻种群能够建立的水深极限条件分别为:2倍SD和2.3倍SD。在冬季透明度为1.1-1.2m条件下,伊乐藻种群在2.5m水深处成功建立。高透明度(>1.1m)是五里湖深水区伊乐藻种群建立的关键条件。在此研究的基础上,本文探讨了重建五里湖深水区沉水植被的可行性策略。

Strategy of Submerged Vegetation Restoration in Pelagic Area of Lake WuLi

To explore the feasibility and strategy of the restoration of submerged vegetation in pelagic area of LakeWuLi, the growth of Elodea Nuttallii and Potamogeton crispus under different depth was investigated. The results indicate that with the increase of water depth, the stem growth of both plants was increase, however the branches and biomass were decreased. The depth limit of population restoration of E. Nuttallii and P. crispus were 2 fold of SD (Sacchi depth) and 2.3 fold of SD respectively. When SD was 1.1-1.2 m in winter, the population of E. Nuttallii was successfully restored at 2.5 m depth. High SD was the key factor for the restoration of submerged vegetation in Lake WuLi. The strategy of restoration of submerged vegetation in pelagic area of Lake WuLi was suggested to restore E. Nuttallii or P. crispus population in winter to maintain clear water state, and some of the biomass of E. Nuttallii or P. crispus would be harvested at next early summer and native submerged plant species would be introduced. To improve the growth and expanding of native submerged plant species by anti-wave techniques, fish harvesting and algal bloom inhibition, the submerged vegetation of indigenous species will be restored eventually instead of E. Nuttallii.