LY/T 3196-2020Technical regulations for carbon accounting of bamboo forest (English PDF)

4.1 Preparation

In accordance with the provisions of Chapter 4 of LY/T 2259-2014.

4.2 Carbon storage measurement of individual standing bamboo

4.2.1 Standard bamboo biomass modeling sample collection

According to LY/T 2259-2014, 5.7.

4.2.2 Modeling method of standard bamboo biomass

4.2.2.1 Modeling method of standard bamboo on-ground biomass

In accordance with the provisions of Chapter 6 of LY/T 2258-2014.

4.2.2.2 Modeling method of standard bamboo underground biomass

In accordance with the provisions of Chapter 8 of LY/T 2258-2014.

4.2.3 Biomass measurement of standing bamboo

Substitute the diameter at breast height (and bamboo height, age) of standing bamboo into the model established in 4.2.2 to measure the biomass of standing bamboo.

4.2.4 Lizhu's carbon storage measurement

The carbon storage of Lizhu is calculated according to formula (1).

C individual plant = B individual plant CC (1) where.

C Individual plant-the carbon storage of standing bamboo (tC);

B Individual plant-the biomass of standing bamboo (t);

CC--The carbon content in standing bamboo biomass, dimensionless.

4.3 Carbon measurement at the stand level of bamboo forests

4.3.1 Principles of carbon storage measurement

To ensure the accuracy requirements of carbon storage measurement, the method of stratified sampling (classified sampling) should be used to investigate the carbon storage of forests.

Bank, which is based on the principle that the main attributes of the forest stand (tree species composition, plant number density, diameter at breast height, bamboo height, etc.) are the same or relatively consistent.

Line layered measurement. During the investigation, the data of each wooden ruler is recorded in Appendix A.

4.3.2 Quadrat setting

4.3.2.1 Arbor layer

Set up quadrats in layers, 3~5 quadrats in each layer, and the distance between the quadrats is not less than 1 km. According to the dominant bamboo species Characteristics, the size requirements of the plots for different bamboo forest types are as follows.

The area of the large-diameter scattered bamboo and bamboo plots shall not be less than 400 m2; the medium-diameter scattered bamboo and bamboo plots shall not be less than 100 m2, and the number of plants in the plot is not less than 30; the plot area of the small-diameter scattered bamboo forest is not less than 25 m2, and the number of plants in the plot is not less than 30 Strain.

The area of the large-diameter clustered bamboo forest plot is not less than 900 m2 or contains more than 30 clusters and the number of standing bamboos is not less than 150.

The plot area of the middle-diameter clustered bamboo forest is not less than 400 m2 or contains more than 30 clusters and the number of standing bamboos is not less than.200.

The plot area of the small diameter clustered bamboo forest is not less than 100 m2 or contains more than 30 clusters and the number of standing bamboos is not less than 300.

product.

The square size of mixed bamboo and bamboo forests, refer to scattered bamboo and bamboo forests.

The shape of the sample should be set as a square or rectangle.

4.3.2.2 Shrub layer

In each arbor layer sample plot, at least 3 plots are randomly set up, and the area of each plot is not less than 25 m2.

4.3.2.3 Herb layer

In each arbor layer sample plot, at least 3 plots were randomly set up, and the area of each plot was not less than 1 m2.

4.3.2.4 Litter layer

In each arbor layer sample plot, set up 5 litter collection boxes in the middle of the sample square and at the intersection of the diagonals. Each collection box the area is 0.5 m2~1 m2.

4.3.2.5 Dead wood layer

In each arbor layer sample plot, 3 small plots are randomly set, and the area of each plot is not less than 1 m2.

4.3.3 Measurement of bamboo forest stand level biomass carbon storage

4.3.3.1 Arbor layer

In accordance with the provisions of 5.1.1 and 5.2.1 of LY/T 2988-2018.

4.3.3.2 Shrub layer

In accordance with the provisions of 5.1.2 and 5.2.2 of LY/T 2988-2018.

4.3.3.3 Herb layer

In accordance with the provisions of 5.1.3 and 5.2.3 of LY/T 2988-2018.

4.3.4 Measurement of litter carbon storage

According to the regulations of 5.3 of LY/T 2988-2018.

4.3.5 Measurement of carbon storage of dead wood

In accordance with the provisions of 5.4 of LY/T 2988-2018.

4.3.6 Measurement of soil carbon storage

In accordance with the provisions of 5.5 of LY/T 2988-2018.

4.3.7 Measurement of carbon storage of bamboo forest ecosystem

The carbon storage of bamboo forest ecosystem is the biomass carbon storage of bamboo forest trees, shrubs and herb layers and litter, dead wood and soil the sum of soil carbon storage is calculated according to formula (2).

4.4 Measurement of carbon storage in bamboo forests above the stand scale

4.4.1 Satellite data acquisition and vegetation index calculation

In accordance with the provisions of QX/T 188.

4.4.2 Establish a remote sensing inversion model of biomass

Use the remote sensing vegetation index matching the carbon storage density in 4.3 with its geographic location to establish a remote sensing response to bamboo forest carbon storage Model and fit according to formula (4).

4.4.3 Retrieval of bamboo forest biomass density and carbon storage measurement of the entire area grid (pixel) Using the inversion model established in 4.4.2, combined with the need to measure the vegetation index of each grid (pixel) of the bamboo forest According to the data, the bamboo forest carbon storage density of each grid (pixel) in the entire area is inverted, and the whole area is measured according to formula (5) and formula (6).

Carbon storage of each pixel in each region.

4.4.4 Analysis of the degree of spatial variability (spatial autocorrelation) of carbon storage

Based on the bamboo forest carbon storage of each pixel retrieved in 4.4.3, a semivariogram model of bamboo forest carbon storage is established, and it must reflect the degree of spatial variability of carbon storage--variation range.

4.4.5 Resampling to obtain bamboo forest carbon storage above the stand scale

In the variable range of carbon density spatial autocorrelation, the inverted carbon storage is resampled to obtain the bamboo forests of the scale above the stand.

Carbon storage. The spatial resolution of the resampled bamboo forest carbon storage must be smaller than the variable range.

Appendix A

(Informative appendix) Survey table for each bamboo inspection ruler