Sap flow of Salix psammophila and its principal influencing factors at different slope positions in the Mu Us desert
Autoři:
Zhiyong Pei aff001; Shaorong Hao aff001; Guohui Pang aff001; Kai Wang aff001; Tiejun Liu aff002
Působiště autorů:
College of Energy and Transportation Engineering of Inner Mongolia Agricultural University, Hohhot, Inner Mongolia Autonomous Region, China
aff001; Institute of Water Resources for Pastoral Area, Ministry of Water Resources, Hohhot, China
aff002
Vyšlo v časopise:
PLoS ONE 14(12)
Kategorie:
Research Article
doi:
https://doi.org/10.1371/journal.pone.0225653
Souhrn
The changes in sap flow of Salix psammophila growing on a gentle slope (lower slope, P1), a middle slope (P2), and an upper slope (P3), and the response of sap flow to meteorological factors at the different slope positions were studied using the continuous and synchronized observations, the instrument were wrapped stem flowmeter EMS 62 sap-flow heat-balance-based system and the LSI-LASTEM automatic weather station. The results revealed that the soil moisture content was the highest and the growth conditions of Salix psammophila were the best at P1, followed by P2. At P3, however, although good apical dominance was observed, the proportion of dead branches was the highest. Furthermore, the daily variation patterns of sap flow on the three slopes presented as multi-peak bell-shaped curves. The daily accumulation changes in sap flow showed a trend of P1 > P3 > P2, and within the same diameter range, the sap flow at P1 was significantly different from that at P2 and P3, whereas the sap flow at P2 and P3 did not vary significantly. All the three slopes showed a significant and positive correlation with photosynthetically active radiation, atmospheric temperature, and vapor pressure difference, and a significant and negative correlation with relative humidity; however, the degrees of correlation varied slightly. The stepwise regression analysis showed that, at different slopes, different variables were selected for different branch diameters, but photosynthetically active radiation and atmospheric temperature played dominant roles on all slopes. This study reveals the sap flow pattern of Salix psammophila on different slopes and its response mechanism to meteorological factors, which was essential for understanding the restoration ability, physiological adaptability, and ecosystem stability of Salix psammophila communities.
Klíčová slova:
Deserts – Flow rate – Leaves – Shrubs – Solar radiation – Vapor pressure – Water resources – Wind
Zdroje
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