Spatiotemporal variation in the maximum leaf area index of temperate grassland in northern China and its response to climate change

doi:10.7523/j.ucas.2022.072

Abstract

Abstract: There might be great differences in spatiotemporal variation in leaf area index (LAI) of different grassland types; the responses of LAI with different annual variations to climate change are probably distinct. To explore these differences, from the long-term LAI data and meteorological data and the grassland type data, we obtained the temporal and spatial varying characteristics of the maximum LAI of different types of temperate grassland in northern China from 1981 to 2017, and explored the responses of LAI with different annual variations to the changes of air temperature and precipitation. The results showed that the average annual maximum LAI of temperate grassland was (0.76±1.07) m²/m², the higher in the east and the lower in the west. The meadow steppe had the highest LAI ((2.73±1.20) m²/m²) and the steppe desert had the lowest LAI ((0.13±0.17) m²/m²). From 1981 to 2017, the average annual maximum LAI showed a significantly increasing trend. The maximum LAI increased significantly for 32.52% of the area and decreased significantly for 6.31% of the area. The areas with a significantly increasing LAI were greater than those with a significantly decreasing LAI for all the grassland types. The annual average maximum LAI was positively correlated with the annual total precipitation from January to August and the annual mean air temperature for July and August. Both the significant decrease and increase of the maximum LAI was mainly affected by the significant increase of annual mean air temperature for July and August. There existed a critical threshold of the rising rate of air temperature for July and August that influenced the variation in LAI; for the grassland types that accounted for the larger areas, this threshold was 0.042-0.043 ℃/a. LAI increased with the rising air temperature as the rising rate of air temperature was lower than this threshold; conversely, LAI decreased. These results are expected to provide important scientific basis for grassland utilization, protection and restoration in the context of climate change.

Key words: leaf area index, temperate grassland type, spatiotemporal variation, precipitation, summer air temperature

CLC Number:

S812

FENG Yiming, ZHANG Na, YUE Rongwu, YAN Zhihui, LI Zhenyu, LI Xiaofan, Erridunqimuge. Spatiotemporal variation in the maximum leaf area index of temperate grassland in northern China and its response to climate change[J]. Journal of University of Chinese Academy of Sciences, 2024, 41(2): 195-211.

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