| Lake Erhai,located in Yunnan Province in S.W.China,is a large,shallow freshwater plateau lake,and it is currently in the critical period of mid-eutrophication transfoms to eutrophication. Although the Lake Erhai has been completed with the world’s largest ecological restoration of 58km aquatic-terrestrial ecozone,still suffers a series of lake ecological issues after the repairation,such as single dominant species, lower biodiversity,and unstable community structure and so on. Respectively, in March 2010 and June survey of the West Bank Erhai Lake with 1965.15m,1964.85m,1964.55m, 1964.25m,1963.95m,1963.65m, etc.6 height, Water level changes on biomass, density, leaf number, plant height and other indicators of Zizania. The results showed that:(1) Lakeshore bay, estuary of lakeshore beach, the high non-stem grass Zizania lakeshore bay in March to the lowest elevation is distributed to 1963.95m, this time, this corresponds to the depth of 120cm height; Best wild rice seedling growth of the grass height is 1964.85m, this time, the elevation corresponding to the depth of 30cm; After June, Wild rice grass can be distributed to the lowest elevation of 1963.65m. Best wild rice seedling growth of the grass height is 1964.55m, as the water level changes, September and December, compared with the June distribution of wild rice and the most suitable for grass growth of the same height.(2) Sessile non-bay and low lakeshore lakeshore stems non-bay grass distribution of wild rice to the bottom and the elevation was 1964.25m 1963.95m, this time, the elevation corresponding to the depth of 90cm and 120cm; Best wild rice seedling growth of the grass height is 1964.85m, the elevation of the corresponding depth of 30cm. After June Sessile non-bay and low lakeshore lakeshore stems non-bay grass distribution of wild rice to the lowest elevation, compared with no change in March, the most suitable for the growth of wild rice grass height emergence into 1964.55m.(3) Inhibiting the growth of wild rice grass rough and distribution of Erhai Lake with wild rice wild rice grass growth and grass growth distribution Compression Elevation, The wind sessile non-bay lakeshore to seedling growth of wild rice grass height reduced from 1965.65m to 1964.25m, Lower 60cm; And reduce non-sessile elevation 1964.25m Zizania Lakeside bay grass height of plant growth. (4) Reed distribution of the minimum elevation 1964.15m, iris and cattail distribution of the minimum elevation are 1963.95m(5) Different elevation of the lake with a water depth of the growth of wild rice seedling grass density, single-plant biomass and leaf number, with the elevation of the lower density of wild rice straw and biomass showed increases and then decreases; Making various types of grass most suitable for Lakeside Zizania emergence and growth of its elevation at 3 months and 6 months respectively and 1964.55m 1964.85m; Optimum growth and reproduction of wild rice grass is a water depth of 30cm; After June, though the water level rose, but the grass growth and reproduction of wild rice is still the best elevation 1964.55m.(6) Cattail, reeds and iris plant density, biomass, leaf width as the lower elevation (water depth increases) showed increases and then decreases; Periodic surveys of the year, the most suitable for the growth of cattail elevation 1964.55m, best adapted to the height of reeds 1964.95m, the growth of the most appropriate elevation 1964.25m Iris(7) The field test showed that: No wave region the amount of plant growth of the stem, tiller tiller also stem volume growth of more than a wave zone; Lake with plant growth and adaptation is strongly influenced by the waves, eye each other with the investigation proved that poem. Erhai Lake with carrying out the diversity of aquatic plant restoration, taking into account the reality of the storm situation lake select the anti-wave of the emergent plants to restore or to wave dissipation measures more conducive to lake with the diversity of aquatic plant restoration. |
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