摘要
利用玛沁县气象局2003~2021年牧业气象观测站高寒草甸植物的物候资料及1961~2021年气象资料,分析了牧草返青期、开花期、枯黄期与气象因子的关系。结果表明:(1)近61a来,玛沁县年平均气温以0.4℃/10a的趋势升高,年降水量以9.7mm/10a的趋势增加,年日照时数以20h/10a的趋势减少。(2)牧草返青期平均日期为5月7日,平均开花日期为7月14日,平均枯黄日期为9月28日,平均生长期143d。(3)牧草返青期和开花期呈不显著推迟趋势,枯黄期呈明显的推迟趋势,生长期呈延长趋势。(4)牧草返青期与4月中旬降水量呈负相关;牧草开花期与3月下旬气温呈负相关,与5月上旬气温正相关;牧草枯黄期与前期降水量和气温呈正相关。
The phenological data ofalpine meadow steppe plants in maqin meteorological Bureau from 2003 to 2021 and themeteorological data from 1961 to 2021 were used,the relationship between forage regreening period,flowering period,withering period andmeteorological factors was analyzed.The results showed that:(1)In the past 61 years,the annual average temperature inmaqin County increased by 0.4℃/10 a,the annual precipitation increased by 9.7mm/10 a,and the annual sunshine hours decreased by 20h/10a.(2)The average date of regreening period wasmay 7,the average date of flowering was July 14,the average date of yellowing was September 28,and the average growth period was 143 days.(3)The regreening stage and flowering stage of forage showed no significant delay trend,the withering stage showeda significant delay trend,and the growth period showed an extended trend.(4)There was a negative correlation between the regreening periodand the precipitation inmid-April.The flowering period of forage grass was negatively correlated with the temperature in late march and positively correlated with the temperature in early may.The yellowing period of forage grass was positively correlated with the previous precipitation and temperature.
作者
窦花
苏芬
胡德奎
DOU Hua(Maqin County Meteorological Bureaau,Maqin Qinghai 814000,China)
出处
《青海草业》
2023年第2期53-58,72,共7页
Qinghai Prataculture
关键词
高寒草甸
物候
变化特征
Alpine grassland steppe
Phenology
Variation characteristics
