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Host-mediated effects on the reproductive phenological asynchrony of a generalist mistletoe in China

Journal of Plant Ecology 2022年第2期15卷 294-309页

作者： Manru Li Jin Chen Ling Zhang CAS Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMengla 666303China College of Life Sciences University of Chinese Academy of SciencesBeijing 100049China

Host-mediated effects on hemiparasitic mistletoes were hypothesized to contribute to mistletoes reproductive phenological asynchrony,thus providing a longer period of food supply to its mutualistic pollinators and ***,studies with empirical data interrogating this hypothesis are *** monitoring of flowering and fruiting patterns on a generalist mistletoe Dendrophthoe pentandra(Loranthaceae)was conducted for two consecutive years in tropical Xishuangbanna,Southwest *** examined whether flowering and fruiting patterns were seasonal,quantified the degree of stagger within *** populations and determined the factors influencing the first flowering date(FFD)of ***,the effect of change in the number of host species on reproductive phenological asynchrony of mistletoe was *** found that(i)both flowering and fruiting exhibited unimodal peaks in the two consecutive years of the study;(ii)the FFD was significantly influenced by crown area of mistletoe and light,such that clump with larger crown and more light exposure had an earlier FFD and longer flowering and fruiting durations;(iii)different host species had a significant impact on the phenology of ***,contrary to our hypothesis,the number of host species did not significantly change the asynchrony of reproductive phenology of ***,these results suggest that alternative hypotheses are needed to interpret the ecological significance of the number of host species and phenological asynchrony of generalist mistletoes.

关键词： asynchrony Dendrophthoe pentandra first flowering date host effect mutualism

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Changes of the flowering Time of Trees in Spring by Climate Change in Seoul, South Korea

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Phyton-International Journal of Experimental Botany 2020年第4期89卷 1019-1033页

作者： Hyewon Kim Chanwoo Park Jong Hwan Lim Hye Woo Shin Interdisciplinary Program of EcoCreative The Graduate SchoolEwha Womans UniversitySeoul03760Korea Forest Ecology and Climate Change Division National Institute of Forest ScienceSeoul02455Korea Research Institute of Ecoscience Ewha Womans UniversitySeoul03760Korea

flowering onset has attracted much attention in ecological research as an important indicator of climate ***,warmer temperatures advance flowering *** effect of climate warming on flowering onset is more pronounced in spring because the difference between atmospheric and water temperatures creates more rapid convection than in other *** analyzed the correlation between 73 species of spring woody plants in Hongneung Arboretum in Seoul,South Korea and the spring minimum temperature and average precipitation over the past 50 years(1968–2018).The spring minimum temperature and average precipitation have increased over the past 50 years,resulting in the advance of the first flowing date(FFD)in all 73 species by 8.5 days on average.A comparison of FFD changes over time by dividing the survey period into three time periods confirmed the advance of the FFD in 50 species(68%of investigated species)by 11.1 days on average in both Period 2(1999–2008)and Period 3(2009–2018)relative to Period 1(1968–1975).Additionally,a delay of the FFD by 3.2 days on average was observed in 8 *** FFD of Lonicera chrysantha(Caprifoliaceae)advanced by over 40 days and was highly correlated with the increased spring minimum *** of the sensitivity of plant responses to climate change revealed that a temperature rise of 1℃ was associated with an FFD advance of 1.2 days in all *** species that was most sensitive to temperature change was Spiraea pubescens ***(Rosaceae),whose FFD advanced by 4.7 days per 1℃ temperature *** increase in precipitation by 1 mm was found to result in a 0.1-day advance of the FFD of all *** tomentosa(Rosa-ceae)was the most sensitive species,that advanced by 2.6 days for each 1 mm increase in ***,for all species,the FFD was more sensitive to the change in temperature than in *** that the current greenhouse gas(GHGs)emission levels or atmospheric CO_(2) conc

关键词： Phenology first flowering date climate change

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The decreasing spring frost risks during the flow- ering period for woody plants in temperate area of eastern China over past 50 years

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Journal of Geographical Sciences 2013年第4期23卷 641-652页

作者：戴君虎王焕炯葛金胜 Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China

The temperate monsoon area of China is an important agricultural region but late spring frosts have frequently caused significant damage to plants there. Based on phenological data derived from the Chinese Phenological Observation Network （CPON）, corresponding meteorological data from 12 study sites and phenological modeling, changes in flowering times of multiple woody plants and the frequency of frost occurrence were analyzed. Through these analyses, frost risk during the flowering period at each site was estimated. Results of these estimates suggested that first flowering dates （FFD） in the study area advanced significantly from 1963 to 2009 at an average rate of -1.52 days/decade in North-east China （P〈0.01） and -2.22 days/decade （P〈0.01） in North China. Over the same period, the number of frost days in spring decreased and the last frost days advanced across the study area. Considering both flowering phenology and occurrence of frost, the frost risk index, which measures the percentage of species exposed to frost during the flowering period in spring, exhibited a decreasing trend of -0.37% per decade （insignificant） in Northeast China and -1.80% per decade （P〈0.01） in North China, implying that frost risk has reduced over the past half century. These conclusions provide important information to agriculture and forest managers in devising frost protection schemes in the region.

关键词： climate change phenology first flowering date frost risk last frost date

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