Herbaceous Dominant the Changes of Normalized Difference Vegetation Index in the Transition Zone Between Desert and Typical Steppe in Inner Mongolia, China

作者：Yanyan Lv, Xueying Zhao, S. R. Zhang, J. G. Zhang, Kexin Yue, Baoping Meng, Muxing Li, Wei Cui, Yi Sun, J. G. Zhang, Li Chang, J. R. Li, Shuhua Yi, Menghong Shen · 发表于：Frontiers in Plant Science · 年份：2022 · DOI：10.3389/fpls.2021.832044 · 被引用次数：13 · 研究领域：Ecology and Vegetation Dynamics Studies、Remote Sensing in Agriculture、Plant Water Relations and Carbon Dynamics

Asymmetric responses of aboveground net primary productivity (ANPP) to precipitation were identified as a signal to predict ecosystem state shifts at temperate grassland zones in Inner Mongolia, China. However, mechanism studies were still lacking. This study hypothesized that the enhanced growth and newly emerged herbaceous after increased precipitation resulted in the highest asymmetry at the transition zone between desert and typical steppe. We monitored the responses of the normalized difference vegetation index (NDVI) of different species to precipitation events using un-manned aerial vehicle technology to test this hypothesis. NDVI and species richness were measured twice at fixed points in July and August with a time interval of 15 days. Results showed that: (1) From July to August, NDVI in the transition zone increased significantly after precipitation ( P < 0.05), but NDVI in both the desert and typical steppe showed a non-significant change ( P > 0.05). (2) In the transition zone, NDVI increases from the shrub and herbaceous contributed to 37 and 63% increases of the site NDVI, respectively. (3) There was a significant difference in species richness between July and August in the transition zone ( P < 0.05), mainly caused by the herbaceous (Chenopodiaceae, Composite, Convolvulaceae, Gramineae, Leguminosae, and Liliaceae), which either emerged from soil or tillers growth from surviving plants. This study demonstrated that herbaceous dominant the ...