Mangrove ecosystem under pressure by anthropogenic activities: Nitrogen, Carbon, and human perspective
Mangrove ecosystem under pressure by anthropogenic activities: Nitrogen, Carbon, and human perspective Pre-proposal By: Mervin E. Pérez and Xianbin Liu
Contents• Research Problems• Goals and Objectives• Methodology• Activities• Potential Benefits
Research Problems• Watershed without forest cover and presence of agriculture and urban zones promote greater sediments and pollution in mangrove ecosystem.• Reduction in mangrove forests cover result in direct coastal pollution by elimination of buffer zone.• Geochemical cycle arrested by mangroves reduction
Research Problems• Lost of mangrove forests means reduction in species richness for both coastal and terrestrial ecosystems• Reduction in good services by poor knowledge of human perception
Goals and Objectives• Determine sediment accumulation in mangrove forests near urban, rural, and protected areas.• Compare sediments among mangrove forests patches to identify anthropogenic impact (local and watershed scale).• Quantify N and C to verify the stability of the mangrove forests habitat.
Methodology• Collect soil samples using cutting ring N and C compound (g/kg) Soil microbial biomass (g/kg) pH• Litterfall using 0.5 m * 4.0 m basket with a screen net. N and C compound (g/kg) Total amount of litter (g/m2)• Atmospheric deposition using plastic cup container Wet and Dry N deposition (mg/g)
• Objective Identify the impact of watershed condition (e.g. forest cover, agriculture, urban areas) in sediments and pollution on mangrove forests• Hypothesis C and N concentration will be lower in watershed with higher forest cover and lower percentage of urban and pasture zones.
Methodology• GIS tool to analyze watershed deposition. Landsat images (30-m resolution) Classify land cover using training samples (supervised and unsupervised procedures) Normalizae Difference Vegetation Index (NDVI) to compare land cover changes Index-water quality analysis
• Objective Identify if sediments have positive or negative effects on mangrove development.• Hypothesis Considering mangrove as an ecosystem with higher resilience, no differences in seed and seedling development will be recorded among study sites.
Methodology• Seeds and seedling transplant experiment – in and ex situ – Germination rates and survival seedling – Size, basal area, biomass vs C and N
• Objective Identify the perspective of human settlement near mangrove forests.• Hypothesis Mangroves present a great number of ecosystem services but some of them are not perceptible for humans (e.g. C and N cycle), then human perception vary according gender, age and social status.
• Human perspective – Questionnaires – Interviews – Workshop – Volunteer program
Potential Benefits• Determine the stability of the mangrove system• Identify the effect of anthropogenic activities on mangrove ecosystem• Change of paradigm about mangrove ecosystem services• Recommendation to mitigate pollution in mangrove areas