黄土高原昼夜不对称性增温及其对植被NDVI的影响

doi:10.18402/resci.2018.08.17

Abstract

Abstract:

In this paper, the meteorological observation data of 102 meteorological stations in the Loess Plateau and its surrounding areas in 1982-2015 were selected. The Normalized Difference Vegetation Index (NDVI) and vegetation type data were used. And the Mann-kendall (m-k) Nonparametric test method and the second-order partial correlation analysis were adopted. The time series change trend and spatial pattern in the growing seasonal minimum temperature (T_min) and maximum temperature (T_max) over the Loess Plateau between 1982 and 2015 were analyzed, and the effects of asymmetric warming on different vegetation type were discussed. The results show that: ① We found a persistent increase (P<0.01) in the growing seasonal T_min and T_max over the Loess Plateau between 1982-2015, whereas the rate of increase of T_min was 1.6 times that of T_max. ②The influence of diurnal asymmetry on vegetation dynamics showed an obvious difference, and NDVI and T_min showed a more significant correlation than NDVI and T_max in vegetative growth season. The effect of nighttime warming on NDVI in the Loess plateau is more significant than that of daytime warming. ③We also found diverse responses of vegetation type to daytime and night-time warming across the Loess Plateau. We found that the partial correlation between NDVI and T_max was positive (P<0.05) except grassland and crop. The partial correlation between T_min and NDVI of crop was negative (P<0.01), and the partial correlation between T_min and NDVI of other vegetation was positive (P<0.05). Our results provide a demonstration for studying regional responses of vegetation to climate extremes under global climate change.

Key words: Loess Plateau, growing season, maximum temperature, minimum temperature, asymmetric warming, NDVI, vegetation dynamics, day and nighttime warming, global warming

Liqun MA, Fen QIN, Jiulin SUN, Hao WANG, Haoming XIA. Diurnal asymmetry of temperature and its effect on NDVI in Loess Plateau[J].Resources Science, 2018, 40(8): 1684-1692.

Figures/Tables 4

References 51

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植被类型	T_max	T_min
草甸	0.63^**	0.66^**
草原	0.31	0.32
灌丛	0.40^*	0.45^**
荒漠	0.46^**	0.50^**
农作物	0.33	-0.48^**
阔叶林	0.62^**	0.70^**

Diurnal asymmetry of temperature and its effect on NDVI in Loess Plateau

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