160 / 2023-08-30 15:24:15

The trend of coal mining-disturbed CDR AVHRR NDVI (1982-2022) in a plain agricultural region— Case Study on Yongcheng Coal Mine and its Buffers in China

CDR AVHRR NDVI,check area (CK),mining activities,climate change,summer maize (Zea mays L.),winter wheat (Triticum aestivum L.),length of growing season (LOS)

Under the global change, studying the dynamic phenology of long-term vegetation in mining disturbance area is helpful to clarify the interaction of climate change and human activities on the ecological environment. By means of regression simulation and trend fitting method, vegetation cover information was extracted using temporal Global Inventory Modeling and Mapping Studies CDR AVHRR NDVI dataset from 1982 to 2022. The study found that (1) The NDVI of the experimental areas increased significantly during the past 41 years, and the average annual NDVI growth rates were 51.85% (in the mining area), 65.91% (in the 10 km buffer), 65.86% (in the 20 km buffer), and 68.09% (in a check area, CK). The mining area had the lowest growth rate, and its vegetation growth activity is the slowest due to coal-mining disturbance. (2) In the mining area, the start of growth (SOS) of winter wheat and summer maize was advanced by 49±1.5 days and 11±1.5 days, while the growth period (LOS) was extended by 59±1.5 d and 17±1.5 days. Correspondingly, in CK, the SOS was advanced by 65±1.5 d and 15±1.5d, and the LOS was prolonged by 72±1.5 d and 19±1.5 d, respectively. Therefore, the extension rate in the mining area was higher than that in the CK. (3) The correlation coefficients between NDVI and temperature in the experimental areas were 0.68652 (the mining area, p<0.01), 0.59372 (the 10 km buffer, p<0.01), 0.67759 (the 20 km buffer, p<0.01), and 0.65912 (the CK, p<0.01), respectively. The advancement of the SOS and the prolongation of the LOS caused by global warming were the bases of the increasing NDVI. Mining disturbance was the principal reason for the slowdown in NDVI growth in the mining area.