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The Yangtze River Basin is an important ecological barrier in China. Understanding the response of the NDVI to climate change during the growing season is important for the effective implementation of ecological and environmental protection strategies. In this study, on the basis of MODIS NDVI data and meteorological data from 2000 to 2020, the response of the NDVI to diurnal temperature and precipitation changes during the growing season was studied through trend analysis, partial correlation analysis and GIS spatial statistical analysis methods. The results revealed the following: from 2000~2020, the growing season NDVI exhibited a fluctuating increasing trend in the Yangtze River Basin, with a growth rate of 0.021/10a. The NDVI exhibited an increasing trend in all subbasins except for Taihu Lake. The overall NDVI exhibited an increasing trend, accounting for 84.19% of the study area, and all subbasins exhibited increasing trends, with the exception of the Taihu Basin, which showed a decreasing trend (60%). (2) During the growing season, Tmax, Tmin and precipitation showed insignificant upward trends, and the increase rate of Tmin was approximately 1.55 times that of Tmax, indicating asymmetric diurnal warming. At the subbasin scale, the change trend was similar to that in the study area except for the Jinsha River Basin. Spatially, Tmax, Tmin and precipitation showed increasing trends, with proportions ranging from 68% to 79%, especially in the Taihu and Wujiang River Basins. The responses of the NDVI to Tmax, Tmin and precipitation during the growing season exhibited spatial heterogeneity, and the range of vegetation growth significantly affected by Tmin and precipitation was greater than that affected by Tmax. The average lag times of the responses of the NDVI to Tmax, Tmin and precipitation during the growing season were 1.6, 1.3 and 1.4 months, respectively. The response characteristics differed across subbasins and vegetation types.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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