Returning farmland to forests is an important means to protect soil fertility. The implementation of conversion of farmland to forests has great benefits for the improvement of soil fertility and moisture. In this place, we can use the soil nutrient speedometer and soil moisture meter to carry out detection and determination. There are many ways to return farmland to forests. The most common ones are based on artificial forestation and rely on natural forces. What is the difference between these two methods? What kind of method is more effective in returning farmland to forests? Today we talk about the effects of the two ways of returning farmland to forests.
1. After abandoning cultivated land, artificially afforested and enclosed watersheds have a higher soil nutrient content than those that rely solely on natural forces for enclosure, and artificially afforestation soils tend to be acidified. Soil total nitrogen, total phosphorus and total potassium content in the artificial afforestation watershed showed a trend of decreasing first and then increasing with the deepening of soil depth, while in the natural enclosed watershed, it showed the first increase and then decrease as soil depth deepens. trend.
2. Organic carbon in soil composition shows that the organic carbon content in the light group is about 1 times higher than the organic carbon content in the recombination under both restoration modes, and the recombination organic carbon content in the soil is nearly 20 in the light group. Times, indicating that the recombinant component is an important organic carbon pool in the soil. Although the concentration of organic carbon in light components is high, the proportion of total organic carbon is very small, accounting for only 3% to 6% of total organic carbon. The content of organic carbon in the reforestation and light groups in the artificial afforestation basin was lower than that in the natural enclosed watershed. The organic carbon content in the soil light group was the largest among the surface layers, while the difference in the middle and lower layers was small. The coefficient of variation of soil organic carbon in the artificial forestation watershed within the three soil depths was greater than that of the natural enclosed watershed.
3. From the perspective of the current recovery of soil total nitrogen, total phosphorus and total potassium, the restoration mode of artificial afforestation in this area is better than that of natural enclosure, and from the aspect of soil organic carbon accumulation, It is a better way to recover from natural enclosure. Due to the small time scale and spatial scale of the study, the extrapolation and application of the results still require further testing and research.
In general, the coefficient of variation under the two recovery modes was roughly expressed as: total nitrogen> total phosphorus> total potassium> pH value, and it showed that the variability of the artificial afforestation basin was greater than the natural seal in each soil depth range. Watershed.
Gsm:29/31/38/42/52/62/82/95
Size :A3/A4/0.914m/1.118/1.2m/1.52m/1.62m/1.7m/1.8m/2m ect ......
regular rolls : 100M 200M 300M 400M 500M 600M 700M 800M 900M 1000M ect ......price per roll
Jumbo roll ,per ton price (excluding cut rolls )
fast dry sublimation paper
Our advantage : Competitive price with high quality , high and stable quality of paper , up 95% transfer rate , good printing effect , not easy wrinkle, paper is smooth and spotless.
Fast Drying Paper,Quick Drying Paper,Sublimation Paper Heat Transfer,Transfer Paper
Guangzhou YESUN Digital Technology Limited , https://www.sublimationpaperfactory.com