Recently, Professor Cheng Lei Laboratory of School of life sciences, Zhejiang University, based on previous work and related experimental data, discussed the theoretical basis and computational method of deep soil response to climate change. The results, in the form of technical comments, were published in the International Journal of Science in the journal Science in February 23rd.
In summer, people usually experience this: the hotter the weather, the more water they drink, the more they sweat; and the more dogs we see around us, the more they puff and puff their tongues.
And in our land, like people, in the process of global warming and rising temperatures,
Therefore, there are pessimists saying that we must control carbon emissions. Because of the increase of temperature, microbial metabolism will accelerate, carbon emissions will increase, and global warming will further intensify.
And some optimists say it's okay, microbes help fix more carbon in the soil, and global warming is not that scary.
So, climate and soil, a
Break up existing data
Long before Cheng Lei Labs published this technical review, American researcher Hicks Pries and others have published a cover article in Science. Science 3555: 1420. This paper reports the production of CO2 (mainly microbial respiration) in 1 m depth soil under artificial warming, and estimates all soil depth microgenesis. Temperature sensitivity of object respiration
The Q10 value is the multiplier of the increase in the respiration rate of the microorganism at 10 degrees centigrade. This temperature sensitivity value is a very important parameter for predicting the climate model.
But through careful analysis of the original data, laboratory researchers find that there is a large gap between the Q10 values calculated by the existing calculation methods, and this error will cover the difference between the upper and lower soil layers, thus affecting the prediction of climate change.
Therefore, in the study, the laboratory proposed to improve the calculation method of Q10, and proposed a generalized linear model to calculate and analyze the temperature sensitivity of carbon dioxide produced by deep soil. In turn, it solves the problem of temperature sensitivity calculations that deviate significantly from theoretical values due to variations in experimental observation data. The laboratory director says this helps to reveal more accurately the response of deep soils to climate change. It has important guiding significance for climate change model to take deep soil into account to predict future climate change.
The paper also proposed the lagging effect of deep soil response to climate change (thermal lag). Because of the dynamic change of global climate system and the influence of soil heat conductivity and soil thickness, the underlying soil temperature change is lagging behind the surface soil. This delay effect is of great significance for the future field experiment of soil warming.
90 guy crack calculation problem, a status on Science
With cutting-edge theoretical discussions, the lab's results were approved by the Science. No rejection, little modification, and a quick vote, which surprised the doctor, Xiao Jing, on the Lunar New year:
In this group, members often have such a puzzle: ask a teacher with questions, sometimes the teacher will not tell students the answer directly, instead, they will give them some documents, so that they can find their answers by themselves.
In the eyes of teacher Cheng Lei, writing papers is not the ultimate goal of doctoral training.
Cheng Lei said that thesis writing is actually a process of sublimation. Students are standing at the forefront of science, linking existing fragmented knowledge, putting forward problems in logical form, solving problems, continuing learning, summarizing rules, presenting research and constantly climbing the peak of science.
Now, this young team composed of post-90s, or even 95 years old, has been working on the soil ecosystem regulated by microbes and the response mechanism of carbon cycle to climate change. On the basis of the theoretical framework for the response of soil carbon cycle to climate change (Cheng et al). Science 337:1084), by combining field experiments, theoretical modeling, big data integration and microbial functional genomics, the laboratory revealed the microbiological mechanism of the underlying soil carbon cycle to climate warming (Cheng et al). ISME Journal 11:1825), and further puts forward the importance of carrying out theoretical and experimental study of deep soil layer and the whole effect of climate change, especially in the study of different ecosystems in different locations, will help to further predict the change of soil organic carbon in the global scale of. However, the related research has a certain challenge in both theoretical and experimental techniques.