Vol16 No.8: 1788-1801
【Title】Spatial-temporal variability of throughfall in a subtropical deciduous forest from the hilly regions of eastern China
【Author】ZHANG Hai-xia1,2,3; WU Hua-wu1*; LI Jing4; HE Bin1; LIU Jiu-fu3; WANG Niu3; DUAN Wei-li5; LIAO Ai-min3*
【Addresses】1 Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China; 3 Chuzhou Hydrology Laboratory, Nanjing Hydraulic Research Institutes, Nanjing 210029, China; 4 Tourism School, Jiujiang College, Jiujiang 332005, China; 5 State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
【Corresponding author】LIAO Ai-min
【Citation】Zhang HX, Wu HW, Li J, et al. (2019) Spatial-temporal variability of throughfall in a subtropical deciduous forest from the hilly regions of eastern China. Journal of Mountain Science 16(8). https://doi.org/10.1007/s11629-019-5424-9
【Abstract】Throughfall variability plays a crucial role in regulating hydrological and biogeochemical processes in forest ecosystems. However, throughfall variability and its potential influencing factors remain unclear in the subtropical deciduous forest because of its complex canopy and meteorological conditions. Here, the spatial variability and temporal stability of throughfall were investigated from October 2016 to December 2017 within a deciduous forest in the subtropical hilly regions of eastern China, and the effects of meteorological variables and distance from nearest tree trunk on throughfall variability were systematically evaluated. Throughfall variability during the leafed period was slightly higher than that during the leafless period inferred from the coefficient of variation of throughfall amounts (CVTF), with 13.2%-40.9% and 18.7%-31.9%, respectively. The multiple regression model analysis suggested that the controlling factors of throughfall variability were different in studied periods: Maximum 10-min rainfall intensity, wind speed and air temperature were the dominant influencing factors on throughfall variability during the leafed period, with the relative contribution ratio (RCR) of 25.9%, 18.7% and 8.9%, respectively. By contrast, throughfall variability was affected mainly by the mean rainfall intensity (RCR=40.8%) during the leafless period. The temporal stability plots and geostatistical analysis indicated that spatial patterns of throughfall were stable and similar among rainfall events. Our findings highlight the important role of various meteorological factors in throughfall variability and are expected to contribute to the accurate assessment of throughfall, soil water and runoff within the subtropical forests.
【Keywords】Throughfall variability; Spatial heterogeneity; Temporal stability; Meteorological variables; Canopy structure; Subtropical forest