三江平原佳木斯草温和雪温变化分析

利用2007 ～ 2011年佳木斯逐日草温、雪温、0 cm地温、气温资料,研究草温和雪温变化规律.结果表明,近5年佳木斯年平均草温和雪温分别为5.7和-11.7℃,草温最高出现在夏季,雪温在春季;1年中5～ 10月观测草温,其他季节雪温和草温交替观测,月平均草温最高在7月,雪温在4月,最低均出现在1月;1d中草温和雪温的最大值均出现在12：00,到次日日出前后出现最小值.草温和雪温各季晴天时日较差最大,且明显大于气温日较差;月平均草温（或雪温）与气温、地温变化趋势基本一致,草温和雪温与气温、地温呈明显的正相关,其相关系数分别为0.990、0.999.

Analysis on Variation of Grass and Snow Temperature in Jiamusi of Sanjiang Plain

Based on the daily temperature data of grass, snow, ground 0 Cm from 2007 to 2011 in Jiamusi, this paper-analyzed the variation of grass and snow temperature. Results indicated that the average annual grass temperature is 5.7 ℃ and the average annual snow temperature is - 11.7 ℃. Average grass temperature is highest in summer, and the seasonal average snow temperature is highest in spring. Through ob- servation, it found that the maximum monthly average grass temperature appears in July, and highest snow temperature appears in April. The minimum average snow and grass temperature are both in January. The maximum of snow and grass temperature appears in 12：00, while the temperature gradually drops to the minimum value around the minute when the sun rises in the next day. The difference of daily grass tempera- ture and snow temperature is highest on sunny day, and it is obviously greater than the difference of daily temperature. The average grass tem- perature （or snow temperature） is basically the same as variation of temperature and ground temperature. Grass temperature, snow tempera- ture, and temperature are positively correlated and the correlation coefficient is 0. 990 and 0. 999 respectively.