Study on the Correlation between Root Respiration and Soil Environment
1 Research method
Due to the close relationship between the root system and the soil, the essence of the early research method for measuring root respiration was how to distinguish it from soil respiration or by estimating the ratio of root respiration to soil respiration. Therefore, the initial root respiration measurement methods are basically Method theory derived from soil respiration. Later, with the development of experimental methods and test instruments, researchers gradually adopted some methods for the direct determination of root respiration. However, there is still a lack of uniform standards for quantitative measurement of root respiration.
In general, the methods for determining the root respiration of plants are divided into indirect and direct methods. The indirect methods include root exclusion, boring method, gap space method, and trunk girdling method. The direct method has an in vitro method. And whole root assay. Measurement methods include root analyzers, CO2 analyzers, oxygen electrodes, infrared gas analyzers, isotope markers, PVC tube gas chambers, etc., of which root analyzers are most commonly used, and the most accurate results are measured by researchers based on the purpose of the study. And test conditions, etc. determine the appropriate research methods.
2 Problems with Root Respiratory Research
There are many methods to measure root respiration, but there are still many problems in the existing research process of root respiration. For example, the measurement methods of respiration are relatively extensive, and most of them are measured by indirect methods. There is a corresponding difference in actual operation. With errors, it is difficult to accurately determine the root CO2 flux. The physiological process of root respiration is dynamic and has great spatio-temporal variability, making it difficult to practice. Respiration is carried out at all times, increasing the difficulty and accuracy of defining the threshold for the consumption of photo-contracts by the breath, and it is also very difficult to determine the specific temporal and spatial changes.
In view of the current lack of mature method for root respiration measurement, the future research should improve the accuracy of root respiration measurement, carry out research on the spatial distribution of respiratory system in roots, and actively research and develop measurement instruments suitable for different domestic ecosystems and different regions to formulate a unified measurement standard. And methods are pressing issues that need to be resolved. In addition, further research on different climatic zones, different types of crops, different stages of growth and development, different site conditions, different soil depths, different roots of different agricultural measures, and regulatory mechanisms will also lay the foundation for further development in this field.
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