干旱对中国北方草原总初级生产力影响的时滞和累积效应

doi:10.13866/j.azr.2023.10.11

Abstract

Abstract:

In recent years, with global warming, the increase of drought events has a more important impact on the photosynthesis of vegetation, and also seriously affects the balance of terrestrial ecosystems. Based on SPEI base v.2.7 and GOSIF GPP data set, this paper studies the cumulative and time-delay effects of drought on GPP in northern grassland. Sen’s slope test, MK trend test and Mann-Kendall mutation test were used to study the temporal and spatial changes of GPP and SPEI during the study period. Pearson correlation analysis method was used to explore the cumulative and time-delay effects of drought on GPP in the north grasslands. The results showed that: (1) From 2001 to 2020, the annual average GPP of the northern grasslands showed a spatial distribution pattern of high in the northeast and low in the southwest, and the annual average SPEI showed a spatial distribution pattern of low in the northeast and high in the southwest, and the annual average of SPEI and GPP showed an upward trend over time. (2) Drought has a cumulative effect on 84.99% of the northern grassland, and the longest cumulative time scale is mainly concentrated in 3-4 months, covering 39.82% of the northern grassland; Drought had a lagging effect on 63.11% of the northern grassland, and mainly occurred in 7 months, covering 19.73% of the northern grasslands. (3) By comparing the variation trends of drought and drought under different water conditions, we found that the cumulative effect of drought on grassland GPP was stronger than the time-lag effect.

Key words: grasslands of northern China, drought, gross primary productivity, time-lag effect, cumulative effect

WU Rina, LIU Buyun, BAO Yuhai. Time lag and cumulative effect of drought on gross primary productivity in the grasslands of northern China[J].Arid Zone Research, 2023, 40(10): 1644-1660.

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干旱水平	SPEI值
极端干旱	SPEI≤-2.0
严重干旱	-2.0<SPEI≤-1.5
中度干旱	-1.5<SPEI≤-1.0
轻微干旱	-1.0<SPEI≤-0.5
湿润	SPEI>-0.5

Time lag and cumulative effect of drought on gross primary productivity in the grasslands of northern China

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