IMPACT OF TREE-THINNING ON FOLIAR CHLOROPHYLL FLUORESCENCE PARAMETERS OF OPEN-CENTRAL APPLE TREES
文献类型: 外文期刊
第一作者: Niu, Zimian
作者: Niu, Zimian;Xie, Peng;Yu, Lu;Li, Zhiqiang;Wang, Hongning;Han, Pingping
作者机构:
关键词: Apple orchard;Tree-thinning;Leaves;Chlorophyll fluorescence
期刊名称:BANGLADESH JOURNAL OF BOTANY ( 影响因子:0.308; 五年影响因子:0.348 )
ISSN: 0253-5416
年卷期: 2015 年 44 卷 5 期
页码:
收录情况: SCI
摘要: Impact of tree-thinning on the diurnal variation, light response curve and its fitting parameters of foliar chlorophyll fluorescence of open-central apple trees was investigated in orchards in China. Compared to the un-thinned control, tree-thinning increased the foliar photosynthetic active radiation (PAR) and PSII electron transport rate (ETR), and maintained the quantum yield of non-regulated heat dissipation and low fluorescence emission (Y(NO)) during the whole day. Under variable intensities of PAR, the thinning treatment enhanced foliar ETR and effective photochemical quantum yield of PS II (Y(II)), decreased the quantum yield of light-induced non-photochemical fluorescence quenching (Y(NPQ)), and maintained the low Y(NO). The thinning also boosted the foliar maximum electron transport rate (ETRmax) and the minimum saturating irradiance (I-K). Tree-thinning improved the light conditions in the canopy of open-central apple trees, resulting in increased foliar ability to utilize the solar energy.
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