Grassland

What are the steps in laying out transect lines in grasslands?

1. Lay out 3 parallel line transect lines. 2. Homogenous area = less # of transects; Diverse area = more # of transects. 3. Record/note the GPS coordinates of transects and establish plots. 4. Collect samples along the transect, every 5m (for diverse area); 15–20m (for homogenous areas).

What are the steps in laying out quadrats in grasslands?

1. Lay out 4 replicate quadrats (50cm x 50cm / 1m x 1m) at each sampling plot. 2. Take note of the area. 3. Record ambient parameters for each station: Air and soil temperature, Relative humidity, Soil pH, Soil Moisture, Soil NPK.

What should be done for identification of grass species?

1. Take photos of the spot characters of grasses (stems, leaves, flowers). 2. Identify them in situ so percent cover can be easily computed. 3. Use digital databases, mobile apps and botanical keys to accurately identify the species.

What are the steps in estimating percent cover of grasses?

1. Estimate the percent cover of the plants found in each replicate quadrat. 2. Using the 10 cm grid on the quadrat, score each species in the grid 3. Record estimates onto the data sheet.

How is percentage cover of grass calculated?

Count the number of squares that are more than half covered with grass. Divide that number by the total number of squares in the quadrat and times the whole thing by 100.

What is used in data analysis of grassland ecosystems?

statistical tools to analyze and present data e.g. species composition, spatial distribution, richness, dominance, evenness, diversity, abundance/density, percent cover, zonation pattern, etc.

What are grassland ecosystems characterized by?

diverse plant and animal species adapted to different environmental conditions.

What is the importance of studying grasslands?

1. Essential for conservation 2. Important for ecosystem management 3. Useful for restoration efforts 4. Helps understand ecosystem structure, function, and health

Why is sampling important in grasslands?

1. Species composition 2. Biomass 3. Soil properties 4. Other ecological parameters

What does accurate sampling allow researchers to do?

1. Make meaningful ecological inferences 2. Study plant productivity 3. Analyze animal behavior 4. Determine impacts of environmental stressors

What does systematic sampling help researchers do?

1. Assess species diversity 2. Evaluate soil condition 3. Understand effects of climate change 4. Understand effects of grazing on ecosystems

What is random sampling?

1. Sampling locations are selected randomly 2. Helps avoid bias

What is stratified sampling?

1. Area is divided into sections or strata 2. Ensures all habitat types are represented

What is the quadrat method used for?

1. Uses square frames for sampling 2. Measures abundance, density, and percent cover

What is the transect method used for?

1. Uses straight lines across habitats 2. Observes changes in vegetation patterns

What is the point-intercept method used for?

1. Records species touching specific points 2. Used to estimate vegetation cover

What is replication in sampling?

1. Taking multiple samples 2. Increases reliability and accuracy of results

What materials are used in sampling?

1. Transect tapes (1 per group) 2. Quadrats (1 or 2 per group) 3. Marker flags 4. GPS devices or mobile phones

What is a transect?

Straight line used for systematic sampling

What are the transect layout rules?

1. 4 transect lines per study site 2. One transect per group 3. Transects should be parallel 4. Transects should be separated by reasonable distances

What is the rule for vegetation diversity and transect length?

1. More diverse vegetation = longer transects needed 2. More homogenous vegetation = shorter and fewer transects needed 3. Separate transects should be placed in different vegetation patches

What is used in this field transect setup?

1. Use a 20–30 meter transect 2. Each transect has 4 plots 3. GPS coordinates recorded from beginning to endpoint of transect 4. Marker flags placed at both ends of transect to mark boundaries

What are the steps in establishing plots?

1. Plots: 4 plots are placed along each transect. 2. Each plot contains 4 quadrats. 3. Plots may be placed: alternately, oppositely along transect lines. 4. Sampling intervals: samples are taken at regular intervals. 5. Usual interval = 5 meters. 6. GPS coordinates: record coordinates of each plot for accurate documentation.

What is the purpose of regular sampling intervals?

1. Describes gradients in community structure 2. Shows changes in vegetation distribution

What are the sampling intervals for different area types?

1. Homogenous Area: sampling interval may be 15–20 meters 2. Heterogenous Area: sampling interval may be less than 5 meters 3. Reason: More variable areas require more frequent sampling

What are physicochemical parameters?

Environmental factors measured in the study area

What is the procedure for measuring physicochemical parameters?

1. Use soil and air sensors 2. Record ambient parameters for each station 3. Measurements: Air parameters are measured 5 times across the transect line; Soil parameters are measured 5 times in each plot 4. Record all measured values

What are the air parameters measured?

1. Air Temperature 2. Humidity

What are the soil parameters measured?

1. Soil Temperature 2. Soil pH 3. Soil Moisture 4. Soil EC (Electrical Conductivity) 5. Soil NPK

What are the components of Soil NPK and their functions?

1. Nitrogen (N): leaf growth and chlorophyll production 2. Phosphorus (P): root growth and energy transfer 3. Potassium (K): water regulation and enzyme activity

What is the purpose of plant identification in situ?

1. Identify plant species inside quadrats 2. Needed for accurate computation of percent cover

What apps are used for initial plant identification?

1. PlantNet 2. PictureThis 3. Google Lens

What is used for verification of plant identity?

Co’s Digital Flora of the Philippines

What is the importance of plant identification?

1. Ensures accurate species data 2. Helps determine species composition and dominance

What is percent cover?

Percentage of ground area covered by grass

What are the steps in calculating grass cover?

1. Count squares more than half covered with grass 2. Divide by total number of squares in the plot 3. Multiply by 100

What is the formula for percent cover?

Percent Cover = (Covered Squares / Total Squares) ×100

What is the importance of percent cover?

1. Measures abundance of grass 2. Determines dominant species 3. Describes vegetation distribution