SHANG Youxian, MAN Xiuling, XU Zhipeng. Transpiration Characteristics and Its Response to Influence Factors of[J]. 2023, 37(2): 310-319.
DOI:
SHANG Youxian, MAN Xiuling, XU Zhipeng. Transpiration Characteristics and Its Response to Influence Factors of[J]. 2023, 37(2): 310-319. DOI: 10.13870/j.cnki.stbcxb.2023.02.036.
Transpiration Characteristics and Its Response to Influence Factors of
To investigate the response of transpiration characteristics of Betula platyphylla secondary forest to influencing factors in permafrost area
and to provide scientific reference for accurate assessment of the hydrological effects of forest ecosystems in this region.The sap flow of Betula platyphylla was measured using thermal dissipation probes from May to September 2021 in permafrost area
and the influence factors were observed simultaneously.The results showed that the stand transpiration of Betula platyphylla secondary forest showed obvious hourly
daily and monthly changes during the study period.(1) The hourly transpiration characteristics of Betula platyphylla secondary forest was exhibited that dominant trees > intermediate trees > suppressed trees.Furthermore
diurnal variations of daily transpiration performed a single peak curve pattern in sunny days
while the bimodal curve was observed in rainy days.Meanwhile
the daily mean stand transpiration of Betula platyphylla secondary forest was 1.47 mm/d
with the maximum value appeared in July.A significant monthly variation of transpiration was found during the whole observation period and ranked as follows:July > June > August > September > May
which was 65.08
62.43
54.27
22.92 and 19.84 mm
respectively.(2) The cumulative transpiration of the stand was 224.54 mm
accounting for 32.41% of the total precipitation over the same period
and the transpiration of the dominant trees was the main contributors to the stand transpiration
accounting for 62.64% of the stand transpiration.(3) At the hourly scale
transpiration was mainly affected by air temperature and vapor pressure deficit.At the daily scale
transpiration was positively correlation with potential evapotranspiration
air temperature
solar radiation
vapor pressure deficit
leaf area index and soil temperature (p<0.01)
which was significant negative correlation with air relative humidity (p<0.01) and no significant correlation with soil water content (p>0.05)
and potential evapotranspiration
leaf area index
vapor pressure deficit and air temperature were the main factors driving the daily stand transpiration.At the monthly scale
air temperature had the greatest impact on stand transpiration
which explained 93.90% of stand transpiration.
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references
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