摘要
利用通辽市巴雅尔吐胡硕牧业气象试验站气象数据和冰草(Agropyron cristatum)生长观测资料,分析科尔沁草原优良牧草冰草生长发育对气候变化的响应。结果表明:近30a来,研究区平均气温升高,降水波动明显,降水年代际距平表现为正-负-正的变化。冰草返青期每年推迟0.67d,生长季每年缩短0.53d,最大生长高度呈降低趋势,但产量呈略增加趋势,产量与降水量年代际变化基本一致。降水量是影响冰草物候期和产量的主要气候因素。冰草返青期和开花期与前期降水量呈负相关关系,关键影响因子分别是2~4月累积降水量和3~5月累积降水量;黄枯期与前期降水量呈正相关关系,关键影响因子是8月降水量。气温对冰草产量的累积主要为负效应;降水量对冰草产量的累积有正效应,关键影响因子是4~7月降水量。综上,冰草在科尔沁草原呈现出对气候变化趋势的增益响应,可作为科尔沁草原北部适宜乡土草种,用于该区域草原建设与畜牧业生产。
The influence of climatic factors on growth and development of Agropyron cristatum was analyzed using the growth data and meteorological data from Enkhbayar Meteorological Station at Tongliao city between 1988 to 2017.The results showed that the average annual temperature increased,and precipitation fluctuated significantly in the past 30 years,in which the interdecadal precipitation was found to be changed positively-negatively-positively.As a result,the reviving period of A.cristatum was delayed by an average of 0.67 d and growing season length was decreased by an average of 0.53 d per year.The maximum height of A.cristatum was decreased while the hay yield was tended to increase,which was consistent with the change of interdecadal precipitation.And precipitation was the dominant factor affecting phenological stage and yield of A.cristatum.The reviving and flowering period of A.cristatum were found to be negatively correlated with antecedent precipitation,in which the key factor was accumulated precipitation from February to April and March to May,respectively.The withered period of A.cristatum was found to be positively correlated with antecedent precipitation in the year and the key factor was rainfall in August.The annual yield of A.cristatum were found to be significantly negative or positive correlated with the average temperature or precipitation,respectively,in which the key factor was the precipitation from April to July.In summary,A.cristatum had dynamically response to the climate change in Horqin grassland,which considered as a suitable native grass specie for grassland restoration and livestock production.
作者
高亚敏
萨日娜
于静
孙琳丽
韩永增
GAO Ya-min;Sarina;YU Jing;SUN Lin-li;HAN Yong-zeng(Tongliao Meteorological Bureau,Tongliao 028000,China;Tongliao Academy of Forestry,Tongliao 028000,China)
出处
《中国草地学报》
CSCD
北大核心
2020年第5期72-79,共8页
Chinese Journal of Grassland
基金
内蒙古自治区自然科学基金(2018MS04001)
干旱气象科学研究基金(IAM201909)
内蒙古自治区科技创新引导项目(KCBJ2018066)。
关键词
冰草
生长发育
气候因素
科尔沁草原
Agropyron cristatum
Growth and development
Climatic factors
Horqin grassland
