Spatio-Temporal Analysis of Carbon Sequestration in Different Ecosystems of Iran and Its Relationship with Agricultural Droughts

The increase in environmental and human-related changes (e.g., the carbon cycle flux of plants) has increased dynamism ecosystems. Examining fluctuations net primary production (NPP) is very important adopting correct strategies for ecosystem management. current study explores spatiotemporal variations NPP its association with agricultural droughts Iran’s ecosystems over 20 years (2000–2020). Mann–Kendall Sen’s slope methods each pixel were used to track trends. Drought upsets terrestrial balance. In this study, Vegetation Health Index (VHI) assess drought that extracted from different bands images satellite. Then, relationship between rates was investigated through running Pearson correlation. results demonstrated annual share sequestration 1.38 kg*C/m2/year. highest rate recorded Caspian Hyrcanian forests. contrast, lowest observed Arabian Desert East Sahero-Arabian xeric shrublands southwestern Iran. Moreover, photosynthesis Tigris–Euphrates alluvial salt marsh, while registered Badghyz Karabil. total, 34.2% studied pixels showed a statistically significant rising or falling trend. estimator sharpest negative trend belonged mixed forests (−12.24 g*C/m2/year), positive Azerbaijan shrub desert steppe (12.29 g*C/m2/year). correlation revealed correlations VHI coefficients ranging −0.93 0.95. largest area (33.97%) Zagros Mountains forest steppe. Identification areas greatest could result prioritizing varied management sequestering. It can be also utilized planning such as scaling up values estimating past ecological capacity.