[1]LI Zhao-qing,ZHANG Wei-qiang,YIN Zuo-yun,et al.Diurnal Changes of Water Potential of the Four Tree Species and Its Relationships with Environmental Factors in the Upper and Middle Reaches of Dongjiang River[J].Research of Soil and Water Conservation,2011,18(01):243-247,267.
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Diurnal Changes of Water Potential of the Four Tree Species and Its Relationships with Environmental Factors in the Upper and Middle Reaches of Dongjiang River
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
18
Number of periods:
2011 01
Page number:
243-247,267
Column:
Public date:
2011-02-20
- Title:
- Diurnal Changes of Water Potential of the Four Tree Species and Its Relationships with Environmental Factors in the Upper and Middle Reaches of Dongjiang River
- Keywords:
- water potential gradient; environmental factors; the upper and middle reaches of Dongjiang river
- CLC:
- P715
- DOI:
- -
- Abstract:
- By using PSYPRO water potential apparatus, six-year-old Schima superba, Castanopsis hystrix, Michelia macclurel, and Castanopsis sfissa, in the upper and middle reaches of Dongjiang River were selected as experimental materials to measure diurnal changes of soil water potential, root water potential, stem water potential, and leaf water potential of four tree species in rainy and dry season, and study on the variations of water potential gradient, and analyze the relationship between leaf water potential and meteorological factors of four tree species in natural habitats. The results showed that the daily water potentials of leaves of four tree species presented single-peak curve. The means of daily water potential of Schima superba was the highest, followed by Michelia macclurel, Castanopsis hystrix, and Castanopsis sfissa respectively. The leaf water potential of four tree species was significantly lower in dry season than that in rainy season (P<0.05). Leaf water potential showed significantly negative correlations with air temperature (Ta) and Photosynthetic Active Radiation (PAR), and significantly positive correlations trend with relative air humidity(RH) and air water potential(Фa), respectively (P<0.01). In addition, the meteorological factors which had a directly effect on the leaf water potential of the four species in Dongjiang watershed showing the following order: Ta > RH > Фa > PAR for Michelia macclurel and Castanopsis sfissa, RH > Фa > Ta > PAR for Castanopsis hystrix, and Ta > Фa > RH > PAR for Schima superba.
- References:
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