| 引用本文: | 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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| 摘要: |
| 【目的】研究臭椿夜间液流与环境因子的关系,以深入揭示臭椿水分利用策略。【方法】采用热扩散式探针法(TDP)对河北保定地区臭椿(6—8月)树干液流密度进行了监测,并同步监测相关环境因子和树干胸径的变化,分析了臭椿夜间液流的变化特征及其影响因素。【结果】臭椿夜间液流通量占日总液流的12.1%,前半夜(20:00-0:00)液流密度大于后半夜(0:00-5:00),前半夜液流通量占夜间液流的65%,后半夜占35%；臭椿后半夜液流同饱和水气压差、风速极显著正相关(P < 0.01),前半夜与之相关性较低；晴天臭椿夜间液流大于雨天,且雨天过后的晴天液流明显增大；臭椿夜间液流与冠幅极显著正相关(P < 0.01),与胸径显著正相关(P < 0.05),且日尺度下树干胸径的微变化与液流变化具有较好的线性关系(R2=0.672),夜间胸径处于膨胀阶段,前半夜膨胀幅度大于后半夜,液流和胸径微变化可以共同反映臭椿的水分利用。【结论】臭椿夜间液流受环境因子和其生物学结构综合影响,前半夜主要进行补水,后半夜存在明显蒸腾,且补水大于蒸腾。 |
| 关键词: 臭椿;夜间液流;夜间蒸腾;夜间补水;树干胸径 |
| DOI： |
| 分类号:S721 |
| 基金项目:国家重点研发计划课题(2016YFD0600401) |
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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. |
