Download Lake Taihu China Dynamics And Environmental Change by Boqiang Qin PDF
By Boqiang Qin
There are lots of shallow lakes on the earth. lots of them play a tremendous socio-economic function as participants to the consuming water offer, in flood attenuation, fisheries and game actions. end result of the present anthropogenic alterations within the setting, such lakes swiftly reply to eutrophication and swamping. it's always tough to handle those concerns simply because many adjustments within the ecosystems of shallow lakes are linked to little studied actual tactics. This interplay among the aquatic biota and the actual and chemical atmosphere raises the complexity of shallow lake ecosystems. Lake Taihu, positioned within the delta of Yangtze River, is a customary huge, shallow eutrophic lake with sector of 2338 km2 and greatest intensity of lower than 3m .
This publication presents uncomplicated facts on a number of features of this lake and summarizes learn paintings at the interplay among its ecology and actual limnology. will probably be a reference for lecturers and scholars of freshwater ecology and biology, the aquatic atmosphere quite often, and, so much strikingly, for all these drawn to actual limnology.
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Additional info for Lake Taihu China Dynamics And Environmental Change
Example text
The traditional technique of using sediments from rivers, ponds, or lakes as a fertilizer no longer exists. This change has caused river and lake deposits to increase significantly, soil fertility has decreased, nutrient return and consumption are unbalanced, and chemical fertilizers have to be used, with their consumption increasing yearly. The proportion of organic to chemical fertilizer has changed from 3:7 in the mid-1980s to 1:9 in the mid-1990s. The amount of chemical fertilizer used (N, P, K) was 25 kg/ha in the 1980s and increased to 45 kg/ha in the 1990s.
Although agricultural land has an output value of only 260,000 yuan (US $32,500)/hectare, industrial land has an output value of about 3 million yuan (US $375,000)/hectare. To improve output, agricultural land use has been adjusted, with the proportion of the economic cropping area to all agricultural production areas changing from 7:3 in the early 1980s to 6:4 in the late 1990s. Some low-lying land and rice terraces have been excavated or modified for use as fish ponds for aquaculture. Q. 7552 During the conversion of agricultural land to nonagricultural use, some rivers have been filled in while others became separated from the main river system, thus losing or changing their original ecological functions, influencing nutrient circulation between rivers, reducing absorption and dilution of pollutants, and indirectly causing deteriorating water quality.
Water surface evaporation variation within a year is unimodal. 7). 1%, of the yearly amount. 4% of the year’s total, respectively. 0 Land evaporation includes water surface (except for lake surface) evaporation, soil evaporation, and evapotranspiration. The land annual evaporation ranges from 600 to 800 mm, which is about 70–80% of that of the Lake Taihu surface. The general trend is that the south has higher evaporation rate than the north, and mountainous areas have a higher rate than do the plains.