Climate and land management affect nutrient cycling in grassland ecosystems. We aimed to understand whether temperate and tropical grasslands differ in terms of soil organic carbon (SOC), nitrogen (N), and phosphorus (P) concentrations, and their C:N:P stoichiometric ratios in grazed and ungrazed natural grasslands and pastures. For this, we used a meta-analysis approach (1296 records, 241 papers), and regression models to explain the observed patterns in terms of mean annual precipitation (MAP), mean annual temperature (MAT), altitude, and latitude. SOC, N, and P concentrations were higher in temperate regions than in tropical ones, and they negatively correlated with MAT and MAP. The grassland type effect was more significant for tropical regions. In tropical regions, soil C:N ratios were higher in ungrazed than in grazed pastures, and soil N:P ratios in ungrazed sites were higher in pastures than in natural grasslands. Grazing increases soil N and SOC for natural grasslands in temperate regions. Our findings suggest that soil stoichiometric C:N:P stoichiometric signatures in grasslands differed between tropical and temperate regions on a global scale. P is a key element in regulation and restriction on soil C and N cycling in tropical regions but less in the temperate ones. Our findings suggest the direction of effects of grazing or grassland type on C:N:P stoichiometric signature. Since imbalances in soil stoichiometric ratios may have implications for ecosystem functioning, the assessment of these patterns could serve as a valuable tool for management and conservation of grasslands and pastures in both tropical and temperate regions.

Today humanity faces several complex problems, two of which are global warming and the loss of biological diversity. An agroecological matrix approach, conceives the territory as patches of natural and cultivated vegetation, interconnected to maintain watershed integrity. Many ethnic groups maintain a high biological heterogeneity as in the case of the agrological matrix. This study analyzed features and trends in a specific agroecological matrix, integrating local and scientific knowledge with environmental and social information, as a complex system. For the last 15 years we studied agroecological spaces used by the Ntaj’uy (Zoque-Popoluca) people in Los Tuxtlas, Veracruz, Mexico. Participatory methods were used to understand social interactions and land management decisions. Ecology field methods allowed us to assess soil loss, litter production, water quality, and vegetation structure. Soil erosion, vegetation fragmentation and social marginalization are the most important problems in the region; the tropical sub-evergreen forest has decreased by about 60%, the deciduous forest is down by 80%, and cultivated pastures have increased over 400%. Coffee and milpa agroecosystems could be improved, through product diversification, along with interconnectivity among vegetation patches, to prevent environmental degradation, and improve conditions to reach food sovereignty and income diversification, in a context of Ntaj’uy self-determination in their territories.