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应用生态学报 ›› 2020, Vol. 31 ›› Issue (9): 2935-2942.doi: 10.13287/j.1001-9332.202009.002

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间断加热模式下热扩散技术在侧柏树干液流测定中的适用性

马玉洁1, 张含含1, 李春友2, 张劲松3, 马长明1*   

  1. 1河北农业大学林学院, 河北保定 071000;
    2河北农业大学园林与旅游学院, 河北保定 071000;
    3中国林业科学研究院林业研究所, 北京 100091
  • 收稿日期:2020-03-27 接受日期:2020-06-11 出版日期:2020-09-15 发布日期:2021-03-15
  • 通讯作者: * E-mail: machangming@126.com
  • 作者简介:马玉洁, 女, 1995年生, 硕士研究生。主要从事森林培育研究。E-mail: 791792530@qq.com
  • 基金资助:
    国家重点研发计划项目(2016YFC0500101)资助

Applicability of thermal dissipation probe in the determination of trunk flow of Platycladus orientalis under cyclic heating mode

MA Yu-jie1, ZHANG Han-han1, LI Chun-you2, ZHANG Jin-song3, MA Chang-ming1*   

  1. 1College of Forestry, Hebei Agricultural University, Baoding 071000, Hebei, China;
    2College of Landscape Architecture and Tourism, Hebei Agricultural University, Baoding 071000, Hebei, China;
    3Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China
  • Received:2020-03-27 Accepted:2020-06-11 Online:2020-09-15 Published:2021-03-15
  • Contact: * E-mail: machangming@126.com
  • Supported by:
    the National Key R&D Program of China (2016YFC0500101).

摘要: 为了评估热扩散式探针法中的间断加热模式在侧柏树干液流速率测定中的适用性,提高树木蒸腾耗水测定的准确性,本研究选取侧柏为对象,以整树容器称重法测定值为基准,采用热扩散树干液流测定技术,设置3种不同的加热模式: 60 min/0 min(持续加热模式)、30 min/30 min(30 min加热30 min冷却的间断加热模式)、10 min/50 min(10 min加热50 min冷却的间断加热模式),分析不同加热模式处理下温差的梯度特征。同时构建间断加热模式下Granier校正公式,并进行有效性验证分析其误差大小。结果表明: 间断加热模式计算的液流速率与整树容器称重法测定的蒸腾速率日变化规律一致,且间断加热模式能够迅速升温、降温并趋于稳定。Granier原始公式计算的液流量较小,与称重法相比,降低了61.3%;经拟合后,10 min/50 min校正液流速率公式: Fd=0.0177K0.9457(R2=0.88),30 min/30 min校正液流速率公式: Fd=0.0378K1.3146(R2=0.85)。利用新的公式重新计算的侧柏液流速率较称重法测定的蒸腾速率差异较小,且10 min/50 min校正公式计算的液流速率较蒸腾速率的误差更小,降低了5.9%,可以表达出真实的液流速率。在实际应用中,采用10 min/50 min的间断加热模式能够降低自然温差的影响,减少功耗,准确反映侧柏的真实液流速率。

关键词: 侧柏, 自然温差, 热扩散式法, 间断加热, 树干液流

Abstract: To evaluate the adaptability of the cyclic heating mode in the thermal diffusion probe method (TDP) in the measurement of trunk sap flow and the accuracy of the measurement of tree transpiration water consumption, we selected Platycladus orientalis as the research object and set three different heating modes: 60 min/0 min (continuous heating mode), 30 min/30 min (cyclic heating mode with 30 min heating and 30 min cooling), 10 min/50 min (cyclic heating mode with 10 min heating and 50 min cooling). Based on the measured value of the whole tree container wei-ghing method, the temperature gradient characteristics of different heating modes were analyzed using the measurement technology of thermal diffusive trunk sap flow. The Granier’s corrected formulas of cyclic heating modes were constructed, with its error being analyzed by validity verification. The results showed that sap flow rate calculated by the cyclic heating mode was consistent with the diurnal variation of the transpiration rate measured by the whole tree weighing method. The temperature of cyclic heating mode could quickly rise, fall and performed stably. The sap flow calculated by Granier’s original formula was 61.3% lower than that by weighing method. The corrected Granier formula in the mode of 10 min/50 min and 30 min/30 min were Fd=0.0177K0.9457 (R2=0.88) and Fd=0.0378K1.3146(R2=0.85), respectively. The difference of sap flow rate in P. orientalis by the new formula was smaller than that measured by the whole tree weighing method, and the error of transpiration rate calculated by the 10 min/50 min correction formula was the smallest, 5.9% lower than that calculated by the weighing method, and thus could express the real flow rate. The 10 min/50 min cyclic heating mode could be used to reduce the effect of natural temperature difference, cut down power consumption, and accurately reflect the actual sap flow rate of P. orientalis.

Key words: Platycladus orientalis, natural temperature difference, TDP, cyclic heating, sap flow