Abstract:To understand the spatiotemporal characteristics of suspended solid concentration and nutrients under different wind-wave conditions in the northwestern littoral zone, Lake Taihu, six sites representing four biotopes were investigated for twelve days. The quantity of suspended solids were calculated by gravimetric method and the contents of total phousphorus, total nitrogen, nitrate nitrogen and ammonium nitrogen were analyzed by the high-accuracy layered sampling apparatus. The results showed that the wind speeds were the major factor leading to the increase of the suspended solids in the western Lake Taihu littoral zone and the critical wind speed was 3.6 m/s. The mean concentration of suspended solids in each site was obviously different:non-vegetation areas > vegetation areas > estuary areas > open water areas. The diurnal variation of nitrogen and phosphorous contents were significant, with the total nitrogen of 1.82-4.86 mg/L and the total phosphors of 0.10-1.47 mg/L. The content of ammonium nitrogen was changed between 0.09-2.83 mg/L and nitrate nitrogen was 1.05-3.69 mg/L. In the nearshore non-vegetated areas, the correlation between the total suspended solids and the wind speeds was the strongest with the correlation coefficient of 0.722, while it was only 0.039 in the offshore areas. In addition to the influence of wind speeds, the concentration of suspended solids was also affected by the water depth, topography and aquatic vegetation.