Spatiotemporal Variations of Vegetation Net Primary Productivity and Its Response to Meteorological Factors Across the Yellow River Basin During the Period 1981–2020

Abstract

Based on trend analysis, partial correlation analysis, and Mann–Kendall test, we analyzed the spatiotemporal variations of net primary productivity (NPP) in the Yellow River Basin and their responses to meteorological factors during the period 1981–2020. The results revealed that NPP had high values in the mid-south part but low values in the northwestern part of the Yellow River Basin. The average NPP was 195.3 g C·m−2·a−1 from 1981 to 2020, and the inter-annual fluctuation of NPP showed a significant increasing trend with an increasing rate of 2.35 g C·m−2·a−2 (p < 0.01). The annual mean temperature showed a positive correlation with NPP in 99.6% of the basin, and 91.4% of which passed the 0.01 significant test. NPP and annual precipitation positively correlated in 87.1% of the basin, and 41.7% of which passed the 0.01 significant test. In 75.2% of the basin, NPP was related negatively with annual sunshine hours, and 17.6% of which of which passed the 0.01 significant test.

Spatiotemporal dynamics of net primary productivity and its influencing factors in the middle reaches of the Yellow River from 2000 to 2020

“…During the period from 2000 to 2005, the vegetation coverage in the MRYR gradually increased, and the NPP showed a significant upward trend, with a spatial pattern of decreasing from south to north. Some scholars have studied the change trend of NPP in the Yellow River basin from 2000 to 2015 and from 2000 to 2019, indicating that the NPP increased from north to south, which is consistent with the conclusion in this paper Tian et al, 2022). The lowest annual average NPP in 2001 was 198.21 gCm -2 a -1 .…”

“…Compared with temperature, precipitation has a stronger correlation with NPP in most studies . However, some studies have shown that temperature has a stronger correlation with NPP (Guo et al, 2021;Tian et al, 2022). There were two main reasons for this difference.…”

The Impact of Climate Change and Human Activities on the Spatial and Temporal Variations of Vegetation NPP in the Hilly-Plain Region of Shandong Province, China

“…Nevertheless, the regional disparities in vegetation response to climate shifts are chiefly attributed to the differing vegetation types and hydrothermal conditions prevailing across diverse locales. Congruent with research conducted within the Yellow River Basin and the arid and semiarid regions of northwest China [10,16,22,43], our analysis discerns that the individual explanatory powers of temperature and precipitation on NPP are q (MAP) = 0.393 and q (MAT) = 0.378, respectively (Figure 9a). Such findings underscore temperature and precipitation as the principal climatic determinants impacting the NPP changes in the SDHP vegetation.…”

“…The Shandong Hills on the North China Plain are less influenced by human activities but heavily affected by the ocean and monsoon, with water and heat conditions during the plant growth season being superior, which is conducive to vegetation growth [14,25]. However, primarily because the region is located at the mouth of the Yellow River and Bohai Bay, which has lower terrain and is susceptible to invasion by river sand and seawater [43,44]. Consequently, the area mostly comprises saline-alkali land and coastal mudflats, with high soil salt content, creating a poor growth environment for vegetation and resulting in relatively low NPP values.…”

Spatiotemporal variation and sustainability of NDVI in the Yellow River basin

“…The Yellow River basin has a continental climate, and from southeast to northwest, it ranges from a semihumid climate to a semiarid climate and an arid climate. The main land use patterns in the region are woodland, grassland, and cultivated land (Tian et al, 2019). The temperature annual range is greater than 20 C, and the annual average precipitation is 200-600 mm.…”