| Cite this article: | 刘云洁,张含含,常胜朝,等.臭椿夜间树干液流变化特征及驱动因素[J].灌溉排水学报,0,():-. |
| LIU Yunjie,ZHANG Hanhan,CHANG Shengzhao,et al.臭椿夜间树干液流变化特征及驱动因素[J].灌溉排水学报,0,():-. |
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| Characteristics and driving factors of night sap flow of Ailanthus Altissima. |
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LIU Yunjie1, ZHANG Hanhan2, CHANG Shengzhao3, MA Changming1
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1.College of Forestry,Hebei Agricultural University;2.She County Forestry Development Service Center;3.Hejian City Natural Resources and Planning Department
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| Abstract: |
| 【Objective】Revealing the strategy of water utilization of Ailanthus altissima. Therefore, we studied the relationship between night flow of A. altissima and environmental factors.【Method】The density of sap flow of Ailanthus altissima in Baoding area of Hebei provinceSwas monitored by thermal diffusion probe (TDP) from June to August, the relevant environmental factors and stem contraction characteristics were simultaneously monitored, and the characteristics of night sap flow of A. altissima and its influencing factors were analyzed.【Result】The night sap flow rate of A. altissima accounted for 12.1% of the total daily sap flow, and the density of night sap flow in the first half night (20:00-0:00) was higher than that in the second half night (0:00-5:00). The sap flow rate in the first half night accounted for 65% of the night sap flow, and that in the latter half night accounted for 35%; the sap flow in the second half of the night was highly significantly positively correlated with vapor pressure deficit and wind speed(P < 0.01), while the correlation was lower in the first half of the night; The night sap flow was greater in sunny days than in rainy days, and the sap flow increased significantly in sunny days after rainy days; The night sap flow was highly significantly positively correlated with canopy width (P < 0.01) and significantly positively correlated with diameter at breast height (P < 0.05), and the micro-variation in stem diameter at breast height at the daily scale had a good linear relationship with the change in sap flow (R2 = 0.672). The stem diameter at breast height was in the expansion stage at night, and the expansion in the first half of the night was greater than that in the second half of the night, and the micro-variation of diameter at breast height and sap flow could jointly reflect the water utilization of A. altissima. 【Conclusion】 The night sap flow of A. altissima was influenced by environmental factors and its biological structure, mainly rehydration in the first half of the night, and transpiration in the second half of the night, and rehydration was greater than transpiration. |
| Key words: Ailanthus altissima; night sap flow; night transpiration; night rehydration; stem diameter at breast height. |
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