日照时长对青海湖草地能量平衡的影响

基于青海湖东北部的西海镇环境梯度监测系统9月上中旬的观测数据，利用波文比法计算感热和潜热通量，得到2种极端日照时长和3种日照时长条件下的能量平衡，方差分析和多重比较（LSD法）证明，不同日照条件下能量平衡存在明显差异，表明用日照时长模拟太阳辐射能具有一定的可行性。日照条件对能量平衡的影响主要体现在峰值大小、峰值出现时间、地-气交换形式等方面，峰值随日照时长增加而增大，其他方面要分情况、分时段具体分析。

The influence of sunshine time to the energy balance on rangeland pasture in the Qinghai lake region

Based on the data collected from Environmental gradient monitoring system locating at Xihai town of north and east Qinghai during early and mid September,the Bowen ratio method was used to calculate the sensible heat and latent heat fluxes,and this study drew the energy balance with two kinds of extreme sunlight and three conditions of sunlight.Variance Analysis and Multiple Comparisons(LSD) results showed that the energy balance was different among different sunlight conditions,indicating that it was possible to simulate solar radiation with sunlight.The influence of sunlight on energy balance was mainly reflected by the peak value,peak time,and the forms of land-atmosphere exchange.The peak value increased as the sunlight increased,and the other two should be analyzed with different case and time.