Research progress of vegetation canopy interception in China
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Abstract:
The quantity and spatial distribution of precipitation are changed by the interception of vegetation canopy,and then affect the water cycle of ecosystem.Evaluated canopy interception and its temporal and spatial dynamic changes accurately is of great significance for exploring the process of eco-hydrological cycle and revealing the impact of climate change. Abundant literature analysis is used to deepen the understanding of the interception mechanism.Precipitation characteristics,vegetation physiological characteristics,and meteorological factors affect the canopy interception process.With the continuous precipitation,the canopy interception rate first increased and then decreased.The continuous expansion of vegetation leaf area is conducive to precipitation interception.Wind speed,air temperature,canopy dryness,and other factors can increase additional interception.Precipitation is intercepted variously among different vegetation types.The canopy interception rate of trees is about 30% and that of crops is only about 15%.Precipitation variability is increasing,and the phenological effect of vegetation and land use are also changing,which will deeply affect all links of the water cycle,and then affect the interception of the vegetation canopy.Artificial simulation and indirect observation are used to determine the interception water volume.The artificial simulation method is used to determine the interception water of a few low herbs,shrubs,and crops,and the measurement results are often greater than the actual direct observation.The estimation of interception through the water balance equation is called the indirect observation method,which can well obtain the dynamic change of precipitation interception.The canopy interception model combined with the results of indirect observation can simulate a wider range of canopy interception water.Three canopy interception models have been studied in China.Canopy interception mechanism is one of the emphases of theoretical models,and it requires higher mathematical computing power for researchers.The semi-empirical semi-theoretical model is widely applied because of its fewer parameters and relatively clear physical meaning. Based on the above contents,the research on canopy interception is discussed and prospected:(1) Herbaceous plants play an important role in ecological maintenance and green city construction in arid and plateau areas,so they should be paid more attention;Different canopy interception measurement methods and problems existing in the operation process will lead to great uncertainty in the measured results,and the measurement method can be improved in combination with global scale remote sensing data;The canopy interception model can be coupled with the global environmental change model to enhance the applicability of the model.
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