Cross-validation of the high-capacity tensiometer and thermocouple psychrometer for continuous monitoring of xylem water potential in saplings
| Autor: | Bruna de Carvalho Faria Lima Lopes, Alessandro Tarantino, Laurent J. Lamarque, Sylvain Delzon, Thierry Fourcaud, Giuseppe Tedeschi, Roberta Dainese |
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| Rok vydání: | 2021 |
| Předmět: |
water tension
0106 biological sciences Materials science Physiology 0211 other engineering and technologies Soil science 02 engineering and technology Plant Science Xylem water potential 01 natural sciences water status monitoring Xylem Thermocouple thermocouple psychrometer 021101 geological & geomatics engineering Alternative methods xylem water potential Hygrometer AcademicSubjects/SCI01210 QK Continuous monitoring food and beverages Water High capacity Research Papers Tensiometer (soil science) Plant—Environment Interactions pressure chamber High-capacity tensiometer 010606 plant biology & botany |
| Zdroj: | Journal of Experimental Botany |
| ISSN: | 1460-2431 0022-0957 |
| DOI: | 10.1093/jxb/erab412 |
| Popis: | The high-capacity tensiometer and thermocouple psychrometer measure xylem water potential with high accuracy and adequate response time, as demonstrated by simultaneous measurements on sapling stems. The pressure chamber, the most popular method used to measure xylem water potential, is a discontinuous and destructive technique and is therefore not suitable for automated monitoring. Continuous non-destructive monitoring could until very recently be achieved only by use of the thermocouple psychrometer (TP). Here we present the high-capacity tensiometer (HCT) as an alternative method for continuous non-destructive monitoring. This provided us with a unique chance to cross-validate the two instruments by installing them simultaneously on the same sapling stem. The HCT and the TP showed excellent agreement for xylem water potential less than –0.5 MPa. Response to day/night cycles and watering was remarkably in phase, indicating excellent response time of both instruments despite substantially different working principles. For xylem water potential greater than –0.5 MPa, the discrepancies sometimes observed between the HCT and TP were mainly attributed to the kaolin paste used to establish contact between the xylem and the HCT, which becomes hydraulically poorly conductive in this range of water potential once dried beyond its air-entry value and subsequently re-wetted. Notwithstanding this limitation, which can be overcome by selecting a clay paste with higher air-entry value, the HCT has been shown to represent a valid alternative to the TP. |
| Databáze: | OpenAIRE |
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