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Harar (Terminalia chebula) and soybean (Glycine max) are the potential tree and agricultural crops of subtropical region of Himachal Pradesh, India, however the potential of these crops under agroforestry system has not been explored both from ecological and economical point of view. The objective of this paper was to determine the effect of harar–soybean combination on soil chemical properties and to analyse the economics of the agroforestry system as compared to the open system. Soybean was grown under harar trees as per the recommended package of practices. Before sowing and after harvesting, soil samples were collected from four directions (East, West, North and South) at three distances (1, 2 and 3 m) from harar trees and open cropping system (sole soybean) for determining chemical properties (pH, electrical conductivity and organic carbon) and nutrient dynamics (nitrogen, phosphorus and potassium). In addition, the soil at two depths (0–15 cm and 15–30 cm) under trees at 2 m distance and in open was analyzed by GC–MS before and after cropping for the presence of allelochemicals that may affect crop yield. The economics of tree-crop combination was worked out and compared with the sole cropping system. The soil chemical properties and available nutrients in soil exhibited maximum values in the north direction. Except available phosphorus content, values of all the studied properties of soil increased with an increase in the distance of soybean crop from harar. It was also observed that values of soil chemical properties and nutrient contents increased significantly after intercropping in comparison to those before intercropping soybean. A substantial increase in soil properties was observed under the agroforestry system over the sole cropping system before sowing and after harvesting soybean. It was revealed that allelochemicals viz., octadecanoic acid, 1,2-benzenedicarboxylic acid and phthalic acid which do exist in harar trees were also detected in soil under the canopy of harar trees. The total cost of cultivation (Rs. 45,028.49 ha−1), gross returns (Rs. 101,937.78 ha−1), net returns (Rs. 56,909.29 ha−1) and benefit–cost ratio (2.26) were higher under the agroforestry system (harar + soybean) over sole soybean cropping. Improvement in soil health, soybean yield and higher economic returns indicated that combination of harar and soybean can be a viable option for farmers of subtropical areas of Himachal Pradesh for the upliftment of their socioeconomic status. [ABSTRACT FROM AUTHOR]

Anthropogenic land use and land cover changes are major drivers of environmental degradation and declining soil health across heterogeneous landscapes in Central India. To examines the land cover changes and spatio-temporal variations in forest carbon stock and soil organic carbon (SOC) over the past 25 years in central India. Geospatial techniques, coupled with ground measurements were employed to detect changes in land cover, carbon stocks in vegetation, and soil carbon in various vegetation types. The results indicate that forested areas have decreased, while agriculture and habitation have expanded between 1997 and 2022. Vegetation C stocks varied significantly (P < 0.05) from 39.42 to 139.95 Mg ha−1 and the SOC varied from 7.02 to 17.98 Mg ha−1 under different soil profiles across vegetation types, which decreased with soil depth, while the pH and bulk density increased. The maximum bulk density in the soil was found at a depth of 40–60 cm (lower profile) in Bamboo Brake, while the minimum was observed under Dense Mixed Forest at a depth of 0–20 cm (top profile). The topsoil profile contributed 33.6%–39%, the middle profile (20–40 cm) was 33.6%–34.4%, and the lower profile was 26.5%–30.8% of soil organic carbon. The study site has experienced rapid carbon losses due to changes in land cover, such as illegal expansion of agriculture, encroachments into forest fringes, and activities like selective logging and overgrazing, which have degraded dense forests. The ecological engineering of degraded ecosystems poses a great challenge and application of complex biological, mechanical and engineering measures is highly cumbersome, expensive, uneconomical and practically not feasible for upscaling. Nevertheless, proposed nature-based solutions mimic natural reparation and processes provide sustainable interventions for the reclamation of ruined landscapes besides improving ecological integrity and rendering many co-benefits to ecosystems and human societies. • Anthropogenic LULCC are major drivers of environmental degradation and declining soil health. • Vegetation C stocks varied significantly from 39.42 to 139.95 Mg ha−1 • SOC varied from 7.02 to 17.98 Mg ha−1 under different soil profiles across vegetation types. • Proposed nature-based solutions helps in eco-restoration of degraded landscape. [ABSTRACT FROM AUTHOR]