Patent ID: 11921097
Assignee: SICHUAN PROVINCIAL INSTITUTE OF FORESTRY AND GRASSLAND INVENTORY AND PLANNING
Field: Measurement (Instruments)
Classification: CPC G  Y | IPC G

Claim 0:
1. A method for dynamic measurement of individual tree carbon sink, comprising following steps:
(1) equipment arrangement: arranging a communication relay device and a tree diameter measuring sensor for measuring a diameter at breast height of a target individual tree, connecting a data collection terminal to the tree diameter measuring sensor through communication, and connecting the tree diameter measuring sensor to the communication relay device through communication;
(2) automatically collecting individual tree data, and transmitting the individual tree data to the communication relay device;
(3) computation of individual tree carbon sink: computing a height, a volume, a biomass, and a carbon storage of the target individual tree by using the data collected in step (2);
(3.1) computing the height of the target individual tree by using a tree height curve of current tree species in a local region, with the diameter at breast height as an independent variable and the height as a dependent variable;
(3.2) computing the biomass of the target individual tree: performing step (3.3) if an allometric growth equation method is used, and performing step (3.5) if a biomass expansion factor method is used;
(3.3) computing the biomass by using an allometric growth equation, with the diameter at breast height and the height as independent variables and the biomass as a dependent variable, wherein a computational formula is as follows:

W=a(D2H)b 

where W is the biomass of the target individual tree, H is the height of the target individual tree, D is the diameter at breast height of the target individual tree, a and b are coefficients;
(3.4) computing the volume of the target individual tree by using a binary volume table for the local region, with the diameter at breast height and the height as independent variables and the volume as a dependent variable, wherein a computational formula is as follows:

V=aDbHc 

where V is the volume of the target individual tree, H is the height of the target individual tree, D is the diameter at breast height of the target individual tree, and a, b, and c are coefficients;
(3.5) computing the biomass by using the biomass expansion factor method, with the volume as an independent variable and the biomass as a dependent variable, and looking up tables to obtain three default data including a wood density, a root-crown ratio, and a biomass expansion factor, wherein a computational formula is as follows:

W=V×WD×BEF×(1+R)

where WD is the wood density of the target individual tree, BEF is the biomass expansion factor that converts trunk biomass of the target individual tree to aboveground biomass and that is dimensionless, and R is the root-crown ratio of the target individual tree;
(3.6) converting forest biomass into the carbon storage by using a carbon content of forest biomass, and converting the carbon storage into a carbon dioxide equivalent, wherein a computational formula is as follows:

Cs=(44/12)×W×CF 

where Cs is the carbon storage of the target individual tree, and CF is the carbon content of the target individual tree;
(4) detecting state changes of the target individual tree, and performing step (6) if a monitoring state of the target individual tree changes, otherwise performing step (5);
(5) continuous monitoring of the target individual tree carbon sink: continuously receiving the data collected in step (2) at a set monitoring frequency and performing step (3), while storing the data;
(6) verification on the monitoring state of the target individual tree: verifying the state of the target individual tree on site, determining on site whether the monitoring state of the target individual tree changes due to equipment reasons or the state of the target individual tree changes, and performing step (1) if the monitoring state of the target individual tree changes due to equipment reasons and the monitoring continues, or ending the process if the state of the target individual tree changes or the monitoring does not continue.