果洛地区连阴雨变化特征及对牧草产量的影响

CHARACTERISTICS OF CONTINUOUS RAIN AND ITS EFFECT ON FORAGE YIELD IN GUOLUO AREA

本文利用1976~2020年果洛州6个气象站降水和牧草生长等观测资料,采用数理统计法和线性趋势法分析了该地区连阴雨的变化特征及对牧草产量的影响。结果表明:1976~2020年果洛地区连阴雨以0.665次/10 a的趋势增加,多出现于夏季;连阴雨的持续时间为5~14 d,久治是果洛地区连阴雨发生的中心,持续时间最长;连阴雨的空间分布由东南向西北减少;连阴雨过程降水量、持续时间和强度均影响牧草产量。

Based on the observation data of precipitation and forage growth and so on from 1976 to 2020 at six meteorological stations in Guoluo Prefecture.The variation characteristics of continuous rain and its effect on forbage yiedl were analyzed by mathematical statistics and linear trend method The results showed that from 1976 to 2020,the continuous rain in Guoluo area increased at the rate of 0.665 times/10 a.The duration of continuous rain is 5~14 days.Jiuzhi is the center of continuous rain in Guoluo area,and the duration is the longest.Mostly in summer.The precipitation,duration and intensity of continuous rain affect vegetation coverage,grass height and grass yield.The influence of continuous rain on vegetation is different in different areas and months.The spatial distribution of even overcast rain decreased from southeast to northwest.