Impacts of environmental and canopy conditions on the nighttime sap flow of larch plantations in the Liupan Mountains, China

doi:10.1007/s11676-023-01619-0

Abstract

Abstract:

Nighttime sap flow (Q _n) is an important physiological activity under which trees manage drought stress. An in-depth understanding of the characteristics of Q _n and its response to environmental and canopy conditions are of significance for arid area forest and water management. This study measured daily sap flow (Q _s) of a Larix principis-rupprechtii plantation in the Liupan Mountains, northwest China during the 2017–2019 growing seasons, and separated Q _s into daytime sap flow (Q _d) and Q _n. Meteorological conditions (reference evapotranspiration, ET_ref), canopy structure (leaf area index, LAI), and soil moisture (relative soil water content, RSWC) were considered as the main biophysical factors affecting Q _n. The structural equation model and upper boundary line method determined the effects of compound and single factors on Q _n. The daily mean Q _n values during the growing seasons in 2017, 2018, and 2019 were 0.024, 0.026, and 0.030 mm d⁻¹, accounting for 6.2, 11.2, and 10.1% of Q _s, respectively. Q _n at different canopy development phases (leaf expanding, LG; leaf expanded, LD; and defoliation, DF) over three years was LD > LG > DF. Q _n increased with increasing ET_ref, whereas the ratio of Q _n to Q _s decreased. Q _n did not show regular variation in the three-year growing seasons under different soil moisture conditions. ET_ref and LAI mainly controlled Q _n by affecting Q _d, whereas RSWC had no significant effect on Q _n. Q _n had a positive and linear relationship with LAI and a quadratic relationship with ET_ref. Both explained 40% of variation in Q _n. Meteorological and canopy conditions are important factors affecting Q _n on the semi-humid study site. The application of the Q _n model coupled with the impact of ET_ref and LAI furthers understanding of the impacts of climate and forest structure change on Q _n.

Key words: Nighttime sap flow, Reference evapotranspiration, Leaf area index, Soil moisture, Multi-factor impact

Songping Yu, Jianbin Guo, Zebin Liu, Yanhui Wang, Lihong Xu, Pengtao Yu, Liang He. Impacts of environmental and canopy conditions on the nighttime sap flow of larch plantations in the Liupan Mountains, China[J]. JOURNAL OF FORESTRY RESEARCH, 2023, 34(6): 1927-1940.

Songping Yu, Jianbin Guo, Zebin Liu, Yanhui Wang, Lihong Xu, Pengtao Yu, Liang He. [J]. 林业研究(英文版), 2023, 34(6): 1927-1940.

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