高原(数学)
白天
降水
环境科学
干旱
气候学
植被(病理学)
生长季节
气候变化
全球变暖
大气科学
自然地理学
物候学
纬度
地理
生态学
气象学
地质学
医学
数学分析
数学
病理
生物
大地测量学
作者
Wen He,Miaogen Shen,Nan Jiang,Jin Chen,Yanhong Tang,Song Gu
标识
DOI:10.1016/j.scitotenv.2023.164382
摘要
Many studies have reported that daytime warming advances the end of the vegetation growing season (EOS) in arid and semi-arid ecosystems in the northern middle latitudes. This finding, however, seems to contradict the fact that low temperature constrains alpine vegetation activity. Using EOS from 1982 to 2015 retrieved from satellite observations, we show that daytime warming could facilitate a delay in EOS on the Tibetan Plateau, the world's largest and highest alpine region, with a dry and cold climate. Our analysis revealed a positive partial correlation (REOS–Tmax) between EOS and preseason mean daily maximum temperature (Tmax) on 57 % of the Plateau in wetter years, but on only 41 % of it in drier years. At a regional level, REOS–Tmax was 0.69 (P < 0.05, t-test) during wetter years and −0.56 (P = 0.11) during drier years, indicating that daytime warming could directly delay EOS on the Plateau. On the other hand, we found a positive partial correlation (REOS–Prec) between EOS and preseason cumulative precipitation on 62 % of the Plateau during warmer years, but on only 47 % during colder years. At a regional level, REOS–Prec was 0.68 (P < 0.05) during warmer years and − 0.28 (P = 0.46) during colder years. Moreover, REOS–Prec increased on 60 % of the Plateau under increasing Tmax during 1982–2015, suggesting that daytime warming facilitates a delay in EOS on the Tibetan Plateau by regulating the effect of precipitation on EOS. Thus, to improve autumn phenology models in this region, researchers should consider the interactive effects of temperature and precipitation on EOS.
科研通智能强力驱动
Strongly Powered by AbleSci AI