Time lags responses of terrestrial natural vegetation to asymmetric diurnal warming in Xinjiang
ZHANG Jun-yong1,2, DING Jian-li1,2, HUANG Shuai1,2, WU Peng-fei3, TAN Jiao4
1. College of Resource and Environment Sciences, Xinjiang University, Urumqi 830046, China;
2. Key Laboratory of Wisdom City and Environmental Modeling Department of Education, Xinjiang University, Urumqi 830046, China;
3. Urumqi Meteorological Satellite Ground Station, Urumqi 830011, China;
4. School of Computer Science, Xinjiang University of Finance & Economics, Urumqi 830012, China
In order to explore the complex relationship between vegetation productivity and diurnal warming in Xinjiang, this study quantitatively analyzed the variation trend of diurnal warming and the temporal lagging in responses of vegetation, via Normalized Difference Vegetation Index, to asymmetric diurnal warming in the northern of Xinjiang, southern of Xinjiang and Yili valley. The results indicated that:The trend of the diurnal warming in all the three regions were asymmetric with a significant spatial heterogeneity. The nighttime warming was approximately 1.67 times that of daytime in northern Xinjiang during growing seasons, 1.59 times in southern Xinjiang, and 2.67 times in Yili valley. The diurnal temperature difference reduced significantly in Yili region. There was a significant difference in the response of vegetation to the asymmetric diurnal accumulated temperature. The average temporal lags of vegetation response to cumulative Tmax and Tmin in Xinjiang were approximately (0.97±0.93) months and (0.91±0.95) months. Overall, the daytime warming had significantly positive effects on the coniferous forests, broad-leaved forests and meadow grassland vegetation in all three regions; and the nighttime warming had significantly positive effects on the desert grassland and typical grassland.
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