Effect of soil pH on soil microbes
Soil pH is considered by scientists to be an important factor affecting the survival and development of soil microorganisms. We can use soil testers to determine soil pH. In soil microorganisms, soil bacteria and fungi occupy dominant positions in both alkaline and acidic soils. Soil pH can interfere with the composition and diversity of soil microbial communities by affecting the composition, chemical properties and utilization efficiency of the soil matrix.
According to the DGGE fingerprint of fungal fragments, the changes of soil fungal community structure in different Chinese fir forests were analyzed using PCA. The results showed that the change trend was contrary to bacteria, and the soil fungal diversity index of natural forest and mixed forest of Chinese fir and broadleaf was lower than that of soil. Continuous plantation of Chinese fir plantation. The use of culturable techniques by Li Yanmao et al. found that the number of soil bacteria decreased and the number of soil fungi increased significantly in the Chinese fir plantation along with the continuous planting generation. However, this phenomenon was not explained. In this paper, correlation analysis showed that there was a significant positive and negative correlation between soil pH and soil bacterial, fungal community structure and diversity index.
The research in this paper shows that the soil pH value of natural forest and mixed forest of Chinese fir and broadleaf tree is higher than that of continuous plantation Chinese fir plantation. Continuous planting of pure Chinese fir forest will lead to soil acidification. Compared with broad-leaved trees, coniferous litter is rich in waxes, resins, and lignin to decompose to produce acidic substances. Large-area planting of single coniferous species can lead to soil acidification due to litterfall and amount, which is widespread in southern China. . However, when the broad-leaved species are introduced into the management of Chinese fir plantation, this phenomenon can be reversed. Visible, afforestation management measures can affect the composition of the litter caused by changes in soil pH, and then change the composition of soil microbial community structure.
Soil carbon-nitrogen ratio is another important factor affecting the change of soil microbial community structure. The results of this study showed that soil fungal community structure and diversity index were significantly positively correlated with soil C/N. Using the same method, Yao et al. showed that soil fungal diversity changed with increasing soil C/N, and that high C/N soil matrix may be rich in lignin and polyphenols, which can induce certain fungi Grow.
In addition, using the PFLA method, Hackl et al. evaluated changes in the diversity and abundance of fungi in 12 forest soils. The results showed that the organic matter in the forests of coniferous forests had a high carbon-nitrogen ratio and also a richer fungal group. They speculated that Some fungal groups adapt to the high C/N of conifer forest soils, transforming more soil organic carbon through their mycelium.
3600Psi Threaded Ball Valves,Seal Welded Floating Ball Valve,2Pc Carbon Steel Ball Valve,Fire Safe Ball Valve 3600 Psi
ZHENGQIU VALVE GROUP CO.,LTD , https://www.sealweldballvalve.com