Phenological Variation and Its Response to Climate Warming in Semi-Arid Region of Loess Plateau

doi:10.3969/j.issn.1000-6362.2017.01.001

Abstract

Abstract: To reveal the response characteristics of typical plant phenology to climate warming in semi-arid region of the Loss plateau, the variation characters of phenophases for typical plant during spring and autumn was investigated by using correlation methods, based on phonological and temperature data from 1994 to 2014. The results showed that the day difference of leaf-expansion stage for herbaceous plant between earliest date and latest date ranged from 20-36d in historical record, and 20-38d for woody pant. The phenology for herbaceous plant in spring showed an advanced trend, and there was a large difference of phenology for woody plants. The leaf-expansion stage of Peony (Paeonia suffruticoss) and Hankow willow (Salix matsudana) showed an obviously advanced trend. Meanwhile, there was a delay trend in discoloration beginning period and withered beginning period of herbaceous plant, as same as for woody plant, withered the deciduous beginning period in autumn. There was no obviously variation for growing season of Peony, but the growing season of other typical plant increased significantly. The beginning flowering stage was sensitive to temperature in past one month and three months, and temperature from March to May. The beginning flowering stage advanced 5-8d when the temperature increased 1℃. We concluded that the phenology of herbaceous plant in Loss plateau was more sensitive to climate warming than woody plant. For the purpose of ecological restoration, we suggested that choosing insensitive trees to climate warming, including Almond (Prunus armeniaca) and Elm (Ulmus pumila), in vulnerable region of Loss plateau was the best choice.

Key words: Phenophases, Woody plant, Herbaceous plant, First blooming period, Growing season, Dingxi

LEI Jun, YAO Yu-bi, SUN Run, GUO Ji-ping, NIU Hai-yang. Phenological Variation and Its Response to Climate Warming in Semi-Arid Region of Loess Plateau[J]. Chinese Journal of Agrometeorology, 2017, 38(01): 1-8.

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