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系統(tǒng)功能

采用熱擴散技術(shù)測量植物莖干莖流速度，特別適用于莖干較粗的樹木和高大植物。若配合其它傳感器使用，可測量環(huán)境因子（空氣溫濕度，光合有效輻射、土壤溫濕度等）影響下的植物莖流。

工作原理

利用Granier熱擴散傳感器（TDP）原理，把2根熱電偶探針直接插入邊材，上面的探針包含1個電加熱器，下面的探針作為參照，測量加熱探針和參照探針之間的溫差dT。根據(jù)dT和零莖流時的dTm，應(yīng)用Granier模型，可以直接得到每個時刻的莖流速率，再根據(jù)邊材面積求出莖流通量。

對于郁閉冠層下長勢一致的樹木，每棵樹只需一個傳感器。對于不規(guī)則冠層或混合樹種，大樹的莖流速率在樹周不同方向上存在差異，一棵樹需要使用多個傳感器才能準(zhǔn)確測量莖流。直徑在75~150 mm的樹木，每棵樹通常需安裝2套傳感器；直徑在150~440 mm的樹木，每棵樹安裝4套傳感器。

系統(tǒng)特點

雙探針，Granier磚利設(shè)計

探針易插拔，可重復(fù)使用

恒溫加熱，采用熱擴散方法，而不是準(zhǔn)確度較差的熱脈沖方法

可以連續(xù)測量（熱脈沖方法不可以，有等待周期）

應(yīng)用案例

（1）西北農(nóng)林科技大學(xué) 秦嶺

參考文獻(xiàn)

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2.Duberstein, J. A., K. W. Krauss, et al. (2013). "Do Hummocks Provide a Physiological Advantage to Even the Most Flood Tolerant of Tidal Freshwater Trees?" Wetlands: 1-10.

3.Ferro, A. M., T. Adham, et al. (2013). "Performance of deep-rooted phreatophytic trees at a site containing total petroleum hydrocarbons." International Journal of Phytoremediation 15(3): 232-244.

4.Juzwik, J., J.-H. Park, et al. (2013). Biotic agents responsible for rapid crown decline and mortality of hickory in northeastern and north central USA. Proceedings of the 18th Central Hardwoods Forest Conference GTR-NRS-P.

5.Park, J.-H., J. Juzwik, et al. (2013). "Multiple Ceratocystis smalleyi infections associated with reduced stem water transport in bitternut hickory." Phytopathology 103(6): 565-574.

6.Pinto Jr, O. B., G. L. Vourlitis, et al. (2013). "Transpiration by the heat dissipation probe method in transition Amazon-Savannah forest." Revista Brasileira de Engenharia Agrícola e Ambiental 17(3): 268-274.

7.Sullivan, P. L., V. Engel, et al. (2013). "The influence of vegetation on the hydrodynamics and geomorphology of a tree islａnd in Everglades National Park (Florida, United States)." Ecohydrology.

8.Zhang, Y., Y. Shen, et al. (2013). "Characteristics of the water–energy–carbon fluxes of irrigated pear ( Pyrus bretschneideri Rehd ) orchards in the North China Plain." Agricultural Water Management 128: 140-148.

9.Zhou, Y., J. Wenninger, et al. (2013). "Groundwater–surface water interactions, vegetation dependencies and implications for water resources management in the semi-arid Hailiutu River catchment, China–a synthesis." Hydrology and Earth System Sciences 17(7): 2435-2447.

10.趙曉偉, 趙平, et al. (2013). "木荷樹干夜間水分補充的季節(jié)動態(tài)及其與樹形特征和葉片生物量的關(guān)系." 植物生態(tài)學(xué)報 37(3): 239-247.