摘要
根据青海省三江源区兴海县牧业气象站1999-2007年天然牧草数据和气候资料,分析了三江源区兴海县天然牧草生长发育与气象条件的关系,探讨了气候变化对兴海县牧草发育期、高度及产量形成的影响。结果表明:三江源区兴海县牧草返青期与日平均气温≥5℃的初日相一致,黄枯期与日平均气温≥5℃的终日相吻合;牧草返青期与黄枯期均提前,而且黄枯期的提前程度大于返青期;覆盖度每年以1.73个百分点的倾向率减小,而牧草高度以1.08 cm/a的线性趋势上升;在全球气候变暖的背景下,牧草生长季温度升高,加之进入21世纪以来该地区降水量逐渐增多,水热匹配较好,牧草产量增加。
Based on the forages and climate data from 1999 to 2007 collected by Xinghai Agricultural Weather Station in Three-river headwaters region, the relationship between climate and forage growth and the impact of climate change on forage growth period, height and yield were studied. The results indicated that the forage re-greening date was as same as the date of the first day of ≥5℃ daily aver- age temperature and the forage withering date fitted with the date of ≥10 ℃ daily average tempera- ture. The dates of forage re-greening and withering were brought forward, and the withering date was brought forward in more extend. The vegetation coverage reduced at a rate of 1.73 percentage units and the forage height increased 1.08 cm per year. Under the global warming background, the temperature in growth season increased and the rainfall in this area increased as well, the forage yield increased because of better matching between water and heat conditions.
出处
《草业科学》
CAS
CSCD
北大核心
2009年第6期90-95,共6页
Pratacultural Science
关键词
三江源
气候变化
天然牧草
Three-river headwaters region
climate change
natural forage
