Effect of soil pH on soil microbes

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.

Roof and Wall Panel Roll Forming Machine

Roof and Wall Panel are widely used in building: the steel-structured large-scale warehouses, plants, supermarkets,

shopping malls, trade markets, stadiums, holiday villages, sanatoriums, hotels, villas, residences, and different kinds of

greenhouses. What's more, equipment can be designed and manufactured as customers' requests.

No.	Item Name	Lead Time	Package	Qty.	Price/USD FOB Tianjin
1	Roof and Wall Panel Roll Forming Machine	45 working Days	40` Container	1 Set	8800

Roof and Wall Panel Roll Forming Machine Production process

Uncoiling→Feeding material into machine→Roll forming→Measuring length→ Auto cutting→Products

receiving

With the work process of roof and wall panel roll forming machine, we will provide other accessories like

one set Manual Decoiler, one set PLC control station, one oil pump and one set product collect table.

The accessories photos of Roof and Wall Panel Roll Forming Machine

Raw Materials

Equipment and Qty.
Decoiler	1 set
Main roll forming machine	1 set
PLC control station	1 set
Hydraulic station	1 set
Post cut	1 set
Electric motor	1 set
Runout table	1 set

Parameter of Roof and Wall Panel Roll Forming Machine

Processing material: colored steel plate, galvanized plate.

Material thickness: 0.3- 0.8 mm

Material hardness: 195 mpa---350 mpa

Formed width:1015 mm

Forming speed: 12 m/min

Loading capacity:5 T

Uncoiling width:1200 mm

Inner diameter: 450-550 mm

Size of the main part: about 7500 Ñ… 1650 Ñ… 1500

Weight of main part: 3. 5 tons

Voltage: 240 V/50 HZ 3 Phase or as your required

Roller fixer : middle plate

Frame : 350 mm H beam steel welded

Drive mode: case of differential

Material of rollers: 45# steel, surface hard chromium plating

Material of shafts: 45# steel

Diameter of shafts: φ 80 mm

Number of rollers : 13 rollers

Main power: 5.5 kw

Payment terms

Payment: 30% T/T in advance and balance 70% after inspection confirmation before shipment.

Delivery:within 45 working days after receipt of deposit.

Warranty

1. Two years guarantee, and we will provide the technical support for the whole life.

2. Training: the buyer should charge of visa, return ticket, food and accommodation overseas and USD50/person/day for salary, one technician needed.

4. Training time: one week (contains the time of installation and adjustment)

Except the this,we also supply the Wall Partition Roll Forming Machine.

Roof and Wall Panel Roll Forming Machine

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Zhongtuo Roll Forming Machinery Co., ltd , http://www.rollsformingmachines.com