Method for evaluating influence of termites on decomposition of forest rotten wood

Abstract

The invention relates to a method for evaluating the decomposition of forest rotten wood, in particular to a method for evaluating the influence of termites on the decomposition of forest rotten wood, which comprises the following steps of: selecting 12 or more than 6 common arbor and shrub species in a region, manufacturing two identical samples to be tested, packaging one part of the samples by adopting a mesh bag made of a nylon mesh with the aperture of 4mm, and packaging the other part of the samples by adopting a mesh bag made of a nylon mesh with the aperture of 4mm; the sample is used as a decomposition sample control group without isolating termites, and the other part is used as a treatment group for isolating the termites by adopting a mesh bag sealing sample made of a stainless steel mesh with the aperture of 0.5 mm; in the typical forest stand with the same microtopography, a rotten wood decomposition sample plot is established, and sample decomposition information is recycled and detected regularly; and after the decomposed samples of the control group and the treatment group are recovered, determining the mass loss, and comparing the sample decomposition rates of the treatment group and the control group to determine the influence of the termites on the decomposition of the rotten wood. The method can accurately evaluate the influence of termites on forest rotten wood decomposition, and has the advantages of being economical, practical, convenient to operate, convenient to popularize and apply and the like.

Description

technical field [0001] The invention relates to a method for evaluating the decomposition of decayed forest wood, in particular to a method for evaluating the influence of termites on the decomposition of decayed forest wood. Background technique [0002] Termites are an ancient group of social insects that feed mainly on cellulose-like substances. In the digestive system of termites, there is a complete cellulase system. Termites can rely on the cellulase secreted by the symbiotic bacteria secreted by themselves to decompose the lignocellulosic substances in the food, and have the ability to quickly break down rotting wood. In recent years, due to factors such as extreme climate, natural disasters, and interspecific tree competition and death, there are a large number of decayed wood residues on the forest surface. Therefore, people pay attention to the impact of termites on the decomposition of decayed wood, and a lot of research has been done on its mechanism. However, ...

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Problems solved by technology

However, the impact on the decomposition process of decayed wood in forests is difficult to accurately quantify and cannot be scientifically evaluated, and cannot meet the needs of production for the decomposition of decayed wood and the prediction of the material cycle function of the ecosystem

[0003] At present, the evaluation methods of the impact of termites on the decomposition of forest decayed wood mainly include the following methods: (1) Based on the feeding marks and degree of termites in decayed wood, but due to the different degrees of preference of termites to different qualities and the influence of bark, The traces of termite feeding usually occur on the sapwood and heartwood of rotten wood, which are difficult to observe and measure with the naked eye, and there is variability; (2) artificial observation of termite feeding and feeding amount is subjective, and it is difficult to provide a unified standard. It leads to difficult and accurate evaluation conclusions; (3) The mainstream judges the impact of termites on the decomposition rate of rotting wood, by artificially delimiting the level of termite feeding, for example, level 1 is 50%. Such a standard can only roughly evaluate the impact of termites on the decomposition of forest decayed wood, but it is difficult to achieve accurate quantification; (4) The method of quantifying the number of termites is used to evaluate However, due to the depletion of nutrients in the decayed wood and the reduction in the number of termites in the middle and late stages of decomposition, the impact of termites in the decomposition of decayed wood cannot be well quantified. In addition, its high input cost makes it impossible to popularize it.

[0004] According to the literature search, there are few studies on the impact of termites on the decomposition of decayed wood.

The research on termites is mostly related to termite gut fungi and fungi in rotten wood, termite control and termite-resistant materials. In 2010, Qiu Haolin et al. set up a bait wood matrix to study the contribution of termites to the decomposition of litter litter by the lure method. These studies all used human visual inspection or uniform bait, which had low accuracy and reliability and could not be used. Scientifically and accurately quantify the impact of termites on the rate of decomposition of rotting wood of common tree species in real forests

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