CN-121995000-A - Whole tree water utilization efficiency continuous monitoring system based on multi-type sensor integration

Abstract

The invention relates to the technical field of tree physiological monitoring and accurate agriculture, in particular to a whole tree water utilization efficiency continuous monitoring system based on multi-type sensor integration, which comprises a multi-sensor collaborative monitoring system and a multi-time sequence data fusion algorithm, wherein the multi-sensor collaborative monitoring system comprises a liquid flow monitoring unit, a trunk radial growth monitoring unit and an environment monitoring unit, and the multi-time sequence data fusion algorithm comprises time scale matching and a dynamic WUE model; the method has the advantages that the method integrates trunk liquid flow, radial growth, temperature and humidity and other multi-type sensors, 24-hour continuous monitoring of multi-source physiological and ecological data can be realized, the single equipment can be operated for a long time after being installed, the monitoring efficiency can be remarkably improved, the cost of manpower and material resources is greatly reduced, in addition, the long-term stable data obtained through the method can reflect the dynamic rule of the tree WUE, and convenience is created for accurately analyzing the response of the tree WUE to environmental changes.

Inventors

• GUO XINWEI
• WU ZHIXIANG
• SUN RUI
• YANG CHUAN

Assignees

• 中国热带农业科学院橡胶研究所

Dates

Publication Date

20260508

Application Date

20251207

Claims (10)

1. 1. The continuous monitoring system for the water utilization efficiency of the whole tree based on the multi-type sensor integration is characterized by comprising a multi-sensor collaborative monitoring system and a multi-time-sequence data fusion algorithm, wherein the multi-sensor collaborative monitoring system comprises a liquid flow monitoring unit, a trunk radial growth monitoring unit and an environment monitoring unit, the multi-time-sequence data fusion algorithm comprises time scale matching and a dynamic WUE model, the liquid flow monitoring unit is used for measuring the liquid flow of the trunk, the trunk radial growth monitoring unit is provided with a high-precision automatic radial growth measuring instrument at the chest height and continuously records the stem circumference change of the trunk, the environment monitoring unit synchronously collects the trunk temperature and humidity parameters, in the time scale matching, the daily accumulation calculation is carried out on the water utilization of the tree and the daily carbon retention data are matched, and in the dynamic WUE model, a ratio function of the water utilization of the tree and the carbon retention is constructed.
2. 2. The continuous monitoring system for the water utilization efficiency of the whole tree based on the multi-type sensor integration according to claim 1, wherein the working method of the liquid flow monitoring unit specifically comprises the steps that double probes are arranged at the chest height, the temperature difference between the two probes is automatically recorded through a data acquisition device, the liquid flow density of the trunk is calculated according to Granier empirical formulas, and then the water utilization amount of the tree is calculated based on the area of trunk strakes.
3. 3. The continuous monitoring system for the water utilization efficiency of the whole tree based on the multi-type sensor integration of claim 1, wherein after the trunk radial growth monitoring unit converts the acquired stem circumference data into breast diameter data, a zero growth model is utilized to identify the structural growth and stem shrinkage stages, the daily growth quantity of the stems is identified based on the structural growth and stem shrinkage stages, and the change quantity of the daily edge area is calculated based on the daily growth quantity of the stems.
4. 4. The continuous monitoring system for the water utilization efficiency of the whole tree based on the multi-type sensor integration according to claim 1, wherein the collected trunk temperature and humidity parameters are used for analyzing the response of the water utilization strategy to environmental changes.
5. 5. The continuous monitoring system for the water utilization efficiency of the whole tree based on the integration of multiple types of sensors according to claim 2, wherein the length of the double probes is 20mm.
6. 6. The continuous monitoring system for the water utilization efficiency of the whole tree based on the multi-type sensor integration according to claim 2, wherein the collection frequency of the data collector is 10Hz, and the collected data are averaged and stored once at intervals of 30 minutes.
7. 7. The continuous monitoring system for the water utilization efficiency of the whole tree based on the multi-type sensor integration according to claim 2, wherein the daily accumulated water consumption is calculated according to the water utilization amount of the tree.
8. 8. The continuous monitoring system for the water utilization efficiency of the whole tree based on the multi-type sensor integration according to claim 3, wherein the daily transpiration of the tree is calculated by correcting the area of the side material in real time by utilizing the relation between the breast diameter and the area of the side material.
9. 9. The continuous monitoring system for whole tree water utilization efficiency based on multi-type sensor integration according to claim 3, wherein tree biomass daily gain and carbon holding amount are calculated by utilizing tree species specific biomass differential speed growth equation and carbon holding amount.
10. 10. The continuous monitoring system for the water utilization efficiency of the whole tree based on the multi-type sensor integration according to claim 1, wherein the resolution of the high-precision automatic radial growth measuring instrument is less than or equal to 2.5 μm.

Description

Whole tree water utilization efficiency continuous monitoring system based on multi-type sensor integration Technical Field The invention relates to the technical field of tree physiological monitoring and accurate agriculture, in particular to a continuous monitoring system for the water utilization efficiency of a whole tree based on multi-type sensor integration. Background The tree Water Utilization Efficiency (WUE) is used as a key physiological index for measuring the relationship between carbon fixation and transpiration water consumption of plants (or an ecological system), and is a core index in forestry and agricultural water management. Although the existing mainstream WUE measurement methods, such as vane gas exchange, stable isotope, and vorticity correlation methods, can provide effective data under certain conditions, there are limitations in terms of temporal continuity, spatial representativeness, and scale transfer. Specifically, the leaf gas exchange method can provide instantaneous WUE data, but cannot meet the long-term and continuous monitoring requirements, and the stable isotope method and the vorticity correlation method can provide data with high spatial resolution, but have scale transfer barriers when converting into individual tree WUE changes, and have higher sampling and analysis cost. Therefore, the prior art has two major core problems of space limitation and time dispersion. To solve the above problem, a learner has tried to calculate the dynamic rule of the whole tree WUE based on a combination of the biometric investigation method and the flow technique, but this method can only provide dynamic data on a month scale, and there is still a big limitation in higher time resolution. This is due to the fact that the data obtained by the biometric investigation method also does not have high time continuity and is prone to large human errors during the measurement process, which may lead to erroneous decisions. In view of this, we propose a continuous monitoring system for the water utilization efficiency of the whole tree based on the integration of multiple types of sensors to solve the existing problems. Disclosure of Invention The invention aims to provide a continuous monitoring system for the water utilization efficiency of the whole tree based on multi-type sensor integration, so as to solve the problems in the background art. The technical scheme is that the whole tree water utilization efficiency continuous monitoring system based on multi-type sensor integration comprises a multi-sensor collaborative monitoring system and a multi-time sequence data fusion algorithm, wherein the multi-sensor collaborative monitoring system comprises a liquid flow monitoring unit, a trunk radial growth monitoring unit and an environment monitoring unit, the multi-time sequence data fusion algorithm comprises time scale matching and a dynamic WUE model, the liquid flow monitoring unit measures trunk liquid flow by adopting a thermal diffusion method, the trunk radial growth monitoring unit is provided with a high-precision automatic radial growth measuring instrument at the chest height and continuously records trunk circumference change, the environment monitoring unit synchronously collects trunk temperature and humidity parameters, the tree water utilization amount is calculated in daily accumulation and matched with daily carbon holding amount data in time scale matching, and a ratio function of the tree water utilization amount and the carbon holding amount is constructed in the dynamic WUE model. Further, the working method of the liquid flow monitoring unit specifically comprises the steps that the double probes are arranged at the chest height, the temperature difference between the two probes is automatically recorded through the data acquisition device, the trunk liquid flow density is calculated according to Granier empirical formulas, and then the water utilization amount of the tree is calculated based on the trunk side material area. Further, after the trunk radial growth monitoring unit converts the acquired stem circumference data into breast diameter data, the zero growth model is utilized to identify the structural growth and the stem shrinkage stage, the daily growth quantity of the stems is identified based on the structural growth and the daily edge area change quantity is calculated based on the daily edge area change quantity. Further, the acquired trunk temperature and humidity parameters are used for analyzing the response of the moisture utilization strategy to environmental changes. Further, the length of the double probe was 20mm. Further, the acquisition frequency of the data acquisition device is 10 Hz, and the acquired data are averaged once at intervals of 30 minutes and stored. Further, a daily cumulative water consumption is calculated from the water utilization amount of the tree. Further, the daily transpiration quantity of the tree is calculated by co