Spatiotemporal Variations in Vegetation Canopy Interception in China Based on a Revised Gash Model
Spatiotemporal Variations in Vegetation Canopy Interception in China Based on a Revised Gash Model
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基于修正的 Gash 模型的中国植被冠层拦截的时空变化
DOI：
10.3390/f13091404
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发表时间：
2022-09
期刊：
影响因子：
2.9
通讯作者：
Si Yi Zhang
中科院分区：
文献类型：
--
作者：
Wei He;Ye Jing;Zhi-Yun Jiang;Chao-Ming Liao;Yong Yu;Jun-Hong Peng;Ya-Duo Zhang;Guo-Long Hou;Si Yi Zhang
植被冠层对降水的截流是全球水文循环的重要组成部分。尽管在全球范围内已经在个体、林分或生态系统尺度上探索了冠层截流的测量和建模，但如何在全球气候变化背景下在区域或全球尺度上认识这一过程仍不清楚。本研究基于遥感和气象数据，采用修正的Gash模型估算林冠截留量。研究了2000-2018年中国Ic的时空变化特征，并探讨了主要环境因子。结果表明，与PML_V2数据集产品和现场实测数据相比，修正后的Gash模型在区域尺度上能够较好地模拟林冠截留。2000—2018年中国年平均Ic为166.55 mm，总体呈现由东南向西北显著递减的空间格局。林冠截留与降水量之比（Ir）也表现出相似的空间格局，平均值为22.30%。在时间尺度上，研究期间年平均Ic以1.79 mm yr−1的速率显著增加（p < 0.01）， 2000-2009年期间增加趋势更为明显，以3.34 mm yr−1的速率增加（p < 0.01）。除落叶阔叶林和温带荒漠外，其余植被类型的冠层截留均呈显著增加趋势（p < 0.01）。降水、温度和归一化植被指数（NDVI）是影响近20 a中国Ic变化的主要因子，不同地区的主导因子有所不同。具体而言，西北地区的Ic变化受降水控制，南方地区主要受温度影响，黄土高原等重要生态建设地区的Ic变化受NDVI影响。我们的研究结果不仅有助于理解区域生态水文循环，而且为区域和全球尺度上的拦截建模方法提供了有价值的见解。
Vegetation canopy interception (Ic) of precipitation is a considerable component of the global hydrological cycles. Although the measurement and modeling of canopy interception have been explored worldwide at the individual, stand or ecosystem scale, it is still unclear how to recognize this process at the regional or global scales within the context of global climate change. In this study, a revised Gash model was employed to estimate canopy interception based on remote sensing and meteorological data. The spatial and temporal variations in Ic were investigated and the main environmental factors were explored in China for the 2000–2018 period. The results showed that the revised Gash model performed well in modeling canopy interception at the regional scale compared with the PML_V2 dataset product and the in-situ measurements. The average annual Ic in China from 2000 to 2018 was 166.55 mm, with a significant decreasing spatial pattern from the Southeastern to the Northwestern regions. The ratio of canopy interception to precipitation (Ir) displayed a similar spatial pattern, with an average value of 22.30%. At the temporal scale, the mean annual Ic significantly increased at a rate of 1.79 mm yr−1 (p < 0.01) during the study period, and the increasing trend was more pronounced during the 2000–2009 period, at a rate of 3.34 mm yr−1 (p < 0.01). In most vegetation types, except for the deciduous broad-leaved forest and temperate desert, canopy interception showed a significant increasing trend (p < 0.01). Precipitation, temperature, and the normalized differential vegetation index (NDVI) were considered to be the main factors affecting the variations of Ic in China during the last two decades, with specific dominant factors varying in different areas. Specifically, precipitation was considered to control the variations of Ic in the Northwestern regions, temperature mainly influenced the Southern regions, and the NDVI was identified as the main factor in regions where significant ecological conservation projects are established, such as the Loess Plateau. Our findings are expected to not only contribute to the understanding of regional ecohydrological cycle but also provide valuable insights into the methodology of interception modeling at the regional and global scales.
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影响因子：
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