A new method of high-resolution NPP estimation and its implementation in caragana shrublands on the Loess Plateau, China

黄土高原 灌木丛 中国 高分辨率 环境科学 遥感 锦鸡儿 黄土 高原(数学) 自然地理学 地质学 土壤科学 地理 生态学 地貌学 数学 生物 生态系统 考古 数学分析
作者
Feiyan Yu,Li Dai,Jiajing Tian,Xiaoning Xue,Mingjie Fang,Yuanming Xie,Zhaoxiang Guo,Bingqian Guo,Xiaofan Gan,Yang Cao,Weiguo Liu
出处
期刊:International Journal of Remote Sensing [Informa]
卷期号:45 (10): 3466-3487
标识
DOI:10.1080/01431161.2024.2346196
摘要

Accurate estimation for vegetation net primary production (NPP) at high resolution is essential for ecosystem management and at local to global scales. However, no reliable methods are available to achieve fine-resolution estimation. In this study, a new NPP estimation system was developed by integrating high spatial resolution remote sensing images, tree ring measurements, and process-based model CASA. The system was illustrated by estimating the historical NPP of caragana shrublands from 2011 to 2021 in Dingbian County, China. The results showed that: (1) by employing the biomass model and tree ring measurements, an NPP-crown width model was established to enable a large number of samples for calibrating the CASA model on high spatial resolution images without continuous field measurements. The calibrated parameters, including maximum NDVI, minimum NDVI, and maximum light use efficiency, were determined to be 0.415, 0.022 and 0.025, respectively; (2) according to the estimation by the calibrated CASA model, the NPP in Dingbian County revealed an increasing trend from 2011 to 2021, and the NPP in southern hilly and gully regions was significantly higher than the other regions; (3) among the different indices, max temperature of warmest month had a significant negative effect on the NPP of cagarana shrublands, whereas annual precipitation had a positive effect. In the northern and central regions, air temperature predominantly influenced NPP, while in the southern regions, both temperature and precipitation played a joint role. The implementation in this study illustrated that the NPP estimation system could provide reliable NPP with high resolution and efficient to monitor and detect dominant factors affecting NPP for ecosystem management.

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