紫外辐射增加后麦田的小气候特征研究(Ⅰ)

Features of Micro-Climate in Wheat Field Under Enhanced UV-Radiation

利用小麦灌浆期作物群体小气候观测资料,分析研究了过量紫外线照射后农作物群体小气候(总辐射、紫外辐射、温度等)的时空分布特征,发现紫外辐射(UV-B)增强使小麦群体中下部的总辐射高于对照区(CK),不同处理组下部的总辐射日振幅不同:CK(无UV-B区)>T1(UV-B增强3.8%)>T2(UV-B增强11.4%);小麦群体的紫外辐射强度在各个层次上均大于对照区;小麦群体的中下部温度明显高于对照区的温度,中上部反之,CK处理气温梯度远大于T2处理气温梯度。

The temporal and spatial distributing characteristics of micro-climate in a wheat field under enhanced UV-B radiation were evaluated with observations. It has been shown that the total solar radiation on middle and low parts of the wheat under enhanced UV-B radiation was more than that of the wheat under normal radiation. The daily amplitude of the total solar radiation varied with the treatments. The UV-B radiation at every level in the wheat was stronger than that of the wheat under normal radiation. The temperatures of the middle,-low parts of the wheat were remarkably higher than those in the normally treatment area, while the temperature of the middle-high part of the wheat were lower than those under the control area. The gradient of the temperature under the control exceeds that under T2.