The influences of climate factors caused by changing vegetation with development

气候因素的影响，即。e.研究了植被变化对气温、净辐射、蒸散率和太阳辐射的影响，结果表明，在植被密度较小时，水稻和草地的冠层温度高于森林。但随着林冠层的发育和植被密度的增加，林冠层温度逐渐接近水稻和牧草的温度。结果表明，退耕还林后，气温变化较大，气温升高，有效辐射与净辐射的比值随绿色覆盖面积的增加而增加，当覆盖面积达到60%以上时，有效辐射与净辐射的比值随覆盖面积的增加而增加，且覆盖面积受有效辐射与净辐射比值的影响，可用方程表示; 0.121 G + 10.321 C + 0.835 S + 3.406（G：绿地面积，C：连续降雨日数，S：大气太阳辐射）。利用不同的冠层模式观测了不同植被下净辐射的变化和夜间降温效应。不同林冠模型的林冠长波辐射不同，从而引起地表温度和气温的变化，林冠下热量收支受植被厚度的影响，随着植被厚度的增加，向土壤的热量传递减少，感热和潜热增加。

The influences of the climate factors, i. e. air temperature, net radiation, evapotranspiratio and solar radiation, caused by changing vegetation were studied.The canopy temperature above paddy rice and grass higher than that of the forest, when the density of vegetations was thin. Howver, the canopy temperature of forest became equal to that of paddy rice and grass, when the canopys were grown up and the density of vegetations became thick. In conclusion, air temperature will be variable and will raise up, when the forest was changed to the paddy field and the grass land.The ratio of effective radiation to net radiation increased with increasing green covered area for above 60 % of greencovered area, and greencovered area was affected by the albedo that was expressed a equation;0.121 G + 10.321 C + 0.835 S + 3.406 ( G:greencovered area, C: continuous rain fall days, S: solar radiation over atmosphere ). Also the changing of the net radiation and the effect of night cooling by difference of vegetation were obsereved by using various canopy models. The longwave radiations from canopies are different for each canopy model, and consequently their surface temperatures and air temperatures changed.The heat budget under canopy is affected by thickness of vegetation and the heat transfer into soil became small with its thickness, otherhand, sensible heat and latent heat became large with it.