Study On Temporal-spatial Distribution Of Biomass And Nitrogen & Phosphorus In Erhai Lakeshore

Monitoring Erhai lakeshore by a year using the method of GPS fixed partition statistical test for providing basic dates and decision-making to the restoration in 2009, administration and resource utilization of aquatic plants in Erhai Lake, Studying on temporal-spatial distribution of biomass,N,P in Erhai lakeshore, The results show that:â‘ Potamogeton maackianus and Vallisneria natan were susceptible to wind wave, the affection of wind wave to hydrophyte's residues was focus on spring and winter, maximum in winter, minimum in summer and autumn. on the gross amount of hydrophyte's residues through wind wave transmission, west (229.2 t/km)>south (200.7 t/km)>north (175.1 t/km)>east (81.1 t/km).â‘¡Growth areas and biomass of Water Hyacinth is up to maximum level in November, mainly in pound,arbor and bay region. and Trapa incise is up to maximum level in September, mainly in non-bay.â‘¢The average concentrations of TN and TP in three ditches were 2529 mg/kg,1250 mg/kg, and their concentrations ranged from 1723mg/kg to 3098 mg/kg,916 mg/kg to 1443 mg/kg, respectively. seasonally, Total nitrogen & phosphorus content of sediment have a smaller range in spring,autumn and winter, and the lowest was in summer. In domain, distribution of sediment was mainly near Dali road and estuary.â‘£Annually, by salvage and reap, Total refloatation amount of biomass was 64 thousand tons (wet weight), Total nitrogen was 250.5 tons, and total phosphorus was 20.9 tons.