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Distribution of leaching, erosion, and runoff losses coefficient of N and P in crop system. (a for N leaching; b for N erosion; c for N runoff; d for P leaching, e for P erosion; f for P runoff.)
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The NUFER (Nutrient Flow in food chains, Environment and Resources) model has been used to reliably quantify nitrogen (N) and phosphorus (P) emissions from agriculture land to water bodies. However, factors impacting agricultural N and P emissions at the island scale have rarely been studied due to the lack of high-resolution spatialization tools,...
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Context 1
... crop system, we used agricultural data (Table S2) at the town level from 2018 and calculated the N,P topsoil , N,P application , and N,P surplus , then used the spatial data ( Fig. S1) to establish the distribution of N and P reduction coefficients (1)-(3) map respectively ( Fig. 1). Finally, N,P topsoil , N,P application , and N,P surplus were evenly allocated to the arable land and economic forest of each county according to the land-use data with a resolution of 30 m × 30 ...Context 2
... crop system, we used agricultural data (Table S2) at the town level from 2018 and calculated the N,P topsoil , N,P application , and N,P surplus , then used the spatial data ( Fig. S1) to establish the distribution of N and P reduction coefficients (1)-(3) map respectively ( Fig. 1). Finally, N,P topsoil , N,P application , and N,P surplus were evenly allocated to the arable land and economic forest of each county according to the land-use data with a resolution of 30 m × 30 ...Similar publications
Reducing greenhouse gas (GHG) emissions and increasing carbon sequestration (CS) in agricultural systems are critical to realize carbon neutrality, and slowdown global climate change. However, a comprehensive analysis of GHG emissions, CS and the ways to achieve carbon neutrality of citrus production systems in China has not been reported. In this...
Citations
... As a result, various studies have attempted to ascertain the environmental sustainability and ecosystem function of Hainan Island, including the tropical rainforest, which is considered a well-preserved national park in Hainan and the country in general [25]. In these studies, questionnaires, spatial weights [18], integrated valuation of ecosystem services and trade-offs (InVEST), the Carnegie-Ames-Stanford Approach (CASA) and revised universal soil loss equation (RULSE) [26], nutrient flow in food chains, environment, and resources (NUFER) [27], and even a static Bayesian network [28] have been used to model and even predict the future water quality. ...
Tropical rainforests are of vital importance to the environment, as they contribute to weather patterns, biodiversity and even human wellbeing. Hence, in the face of tropical deforestation, it becomes exigent to quantify and assess the contribution of ecosystem services associated with tropical rainforests to the environment and especially to the people. This study adopted a nuanced approach, different from traditional economic valuations, to estimate the water-related ecosystem services (WRESs) received by the people from 2010 to 2020 in the Hainan Tropical Rainforest National Park (HTRNP). The study focused on water yield, soil conservation, and water purification using InVEST, the SCS-CNGIS model, and spatial analysis. The results show (1) significant land cover changes within the HTRNP, as forest decreased by 4433 ha and water bodies increased by 4047 ha, indicating the active presence of human activities. However, land cover changes were more pronounced within the 5 km buffer area around the HTRNP, suggesting the effectiveness of the tropical rainforest conservation efforts in place. (2) The water yield of the HTRNP in the years studied decreased by 307.03 km3, based on the water yields in 2010 and 2020, which were 5625.7 km3 and 5318.7 km3, respectively. (3) Change detection showed that runoff mitigation in the rainforest has a negative mean (−0.21), indicating a slight overall decrease in soil conservation and runoff mitigation in the rainforest from 2010 to 2020; however, the higher curve number indicates areas susceptible to surface runoff. (4) The ecological effectiveness of water purification to absorb and reduce nitrogen load was better in 2020 (145,529 kg/year), as it was reduced from 506,739 kg/year in 2010, indicating improved water quality. (5) Population growth is more pronounced in areas with high water yields. Overall, the proposed framework has shown that the water yield potential of the HTRNP can meet the water consumption demands of people and industries situated within the buffer area. However, analysis of the study shows that it does not meet the crop water requirements. This study provides insights for decision makers in identifying potential beneficiaries and the essence of effective area-based conservation measures, and the proposed framework can be applied to any area of interest, offering a different approach in ecosystem services assessment.
... Total P concentrations in most lakes and reservoirs range from ~ 6-70 µg/L, but some lakes show total P concentrations as high as ~ 400-800 µg/L in the Southern Plains Ecoregion, such as Kansas, Oklahoma, and Texas (U.S. EPA 2012). In contrast to freshwater ecosystems like lakes and reservoirs, aquatic environments impacted mainly by agricultural practices (P fertilizer use) and municipal/ household activities (e.g., P-containing detergent use) such as agricultural runoffs (Pote et al. 1996;Daniel et al. 1998;Hart et al. 2004;Liang et al. 2022) and wastewater treatment plants (WWTPs) (Fernández Dueñas et al. 2003;Carey and Migliaccio 2009;Bouzas et al. 2019) often exhibit ordersof-magnitude higher P concentrations. For instance, total P concentrations in untreated wastewaters typically vary between 4 and 12 mg/L (Carey and Migliaccio 2009), but higher total P concentrations around 26 mg/L were also reported in the Vilanova del Vallès WWTP in Spain (Fernández Dueñas et al. 2003). ...
Phosphorus (P) overloading in aquatic environments has long-been recognized as the leading cause of water quality deterioration, harmful algal bloom, and eutrophication. This study investigated P removal performance by five cost-effective carbonaceous materials (CMs) in flow-through packed column systems. These CMs include biochars pyrolyzed from feedstocks of Eucalyptus (E-biochar) and Douglas fir (D-biochar), commercial biochar (C-biochar), iron oxide-coated biochar (Fe-biochar), and commercial activated carbon (AC). The physicochemical properties of CMs, such as specific surface area (SSA), pore volume, pore diameter, elemental composition, and surface charge, were characterized. The packed column experimental results showed that P removal performance followed the order: E-biochar < D-biochar < C-biochar < Fe-biochar < AC. Specifically, the sorption capacity of 1 mg/L of P in packed columns was 0.0036 mg P/g E-biochar, 0.0111 mg P/g D-biochar, 0.0369 mg P/g D-biochar, 0.077 mg P/g Fe-biochar, and 0.088 mg P/g AC, respectively. The largest SSA (1012 m²/g) and pore volume (0.57 cm³/g) of AC accounted for the most outstanding P removal efficiency mainly by physical sorption, while electrostatic interaction explained the high P removal by Fe-biochar (SSA as low as 32.4 m²/g). Our findings provide direct practical implications for effectively removing P in water by cost-effective CMs.
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