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静水精养池塘栽植树木问题是《淡水养殖学》论及的一个问题,即池塘池埂不易栽植树木,树木遮荫,影响水面光能利用,至使影响饵料生物光合作用,影响渔业产量。本文对此论点进行了辨证统一的回答,计算论证结果如下:首先计算冬至日这天的太阳高度角hθ值:把(?)=40°49′呼和浩特地处的纬度;δ=23°27′冬至日的赤纬角;ω时角正午12:00时0°:11:00时至13:00时15°;10:00时至14:00时30°;9:00时至15:00时45°;8:00时只16:00时60°;代入公式:sinhθ=sin(?)·sinδ+con(?)·conδ·conω计算得hθ值:25°47′;24°51′;19°57′;13°21′;5°1′。
The problem of planting trees in still water intensive ponds is one of the problems discussed in Freshwater Aquaculture. That is, pond ponds are not easy to plant trees and shade trees, affecting the utilization of light energy in the water surface, affecting the photosynthesis of fishery crops and affecting fishery production. This paper gives a dialectical unified answer to the argument. The calculation and demonstration results are as follows: First, the solar elevation angle hθ on the solstice day is calculated: (?) = 40 ° 49 ’and latitude at Hohhot; δ = 23 ° 27’ The winter solstice, the declination angle of the winter solstice; ω hour angle 12:00 noon 0 °: 11:00 a.m. to 13:00 p.m. 15 °; 10:00 a.m. to 14:00 p.m. 30 °; 9:00 p.m. to 15:00 p.m. (45 °); 8:00 only 16:00 60 °; Substituting into the formula: sinhθ = sin (?) · Sinδ + con (?) · Conδ · conω Calculated hθ values: 25 ° 47 ’; 24 ° 51’ ; 19 ° 57 ’; 13 ° 21’; 5 ° 1 ’.