"Mr. Ackerman, do you think that if we plant a row of anti-sarin here now, it will still be effective?"

They are back under the original wind outlet, but the wind and sand here are completely different from the wind conditions when they came here before, the wind here has become much stronger, and the wind speed is also a little faster, these are obviously related to the current wind and sand situation in Niamey, if it is not for the increase in the wind here, the sand and dust situation in the capital Niamey will not become so serious. Pen ~ fun ~ pavilion www.biquge.info

Ackerman shook his head, "No! The situation here is much worse than before, and if we plant trees here, the effect will be very poor, because the wind speed through the wind outlet has become faster, so their height has also become much higher, and we have planted trees here, and the effect is not half of last year's. ”

Lin Quan nodded, Ackerman's judgment was basically consistent with his judgment, and Lin Quan also knew that if he continued to plant trees here, the effect would not be particularly good, because the geographical advantage here was gone.

"Alas! It seems that the only way to do this is to go from the inside out! ”

Lin Quan sighed, the current situation can only start from the stupidest way, that is, to start planting trees outside Niamey.

Niamey is located next to the Niger River, but the main urban areas are on the north side of the river, and the south is dominated by large tracts of farmland.

Therefore, the impact of wind and sand on their lives is relatively large, and the impact on agriculture can only be said to be slightly smaller.

But the impact of the wind and sand on life, will bring people a very intuitive feeling, even those who do not farm, can also intuitively feel the inconvenience of these sand cities to their lives, and the farmers who farm because of their relatively low status, and do not have much right to speak, so they are often forgotten, which makes this problem exist before when we do not pay much attention, and now after a little aggravation, everyone feels very uncomfortable.

A little further north of Niamey are large mountains, which are not very tall, but they are very troublesome, because most of them are rocky, bare kinds, which do not do anything to block the wind and sand, and if trees can be planted on them, then the wind and sand situation in Niamey will be solved by half.

But this is obviously just a hypothesis, the conditions are very harsh, and there is no water at all, so the plants basically cannot survive, so there is no way to talk about planting trees in the mountains.

So Lin Quan can only compromise, planning to build a sand-proof forest outside the city of Niamey, this sand-proof forest is about less than five kilometers away from the city, although the effect is not particularly good, but it can reduce some of the sand and dust that has a greater impact on the lives of urban residents, as long as this sand-proof forest grows, the tall trees should be able to reduce the wind and sand blowing to the capital Niamey by half, but the sand-proof forest in the high place is powerless.

Therefore, the agricultural areas in southern Niamey will still be affected, which is equivalent to saving the city and not agriculture, which is of course a situation that the Nigerien Ministry of Agriculture does not want to see, so this can only be regarded as a stopgap measure.

"Plant a sand forest five kilometers outside the city, and then turn over the mountains, and plant a sand forest on the other side of the mountain, so that the wind and sand situation can be partially solved, and the impact of Niamey will be reduced a lot, but this can not completely solve the city's sand and dust situation, we must green this mountain, if this work can be done, the effect is the best, but the difficulty of this task is also the highest!"

Lin Quan looked at Ackerman and a few others, and then drew three lines on the map, these three lines were basically their defense line, and what they had to do was to plant the anti-sand forest in these three places.

"This anti-sand forest near Niamey is the best to do, the water source here is relatively sufficient, this should be the focus of our current work, we first have to plant this anti-sand forest on this side of Niamey, and then the second step is to go to the opposite side of the mountain to plant trees, and finally to solve the most difficult one, what do you think?"

Lin Quan is the team leader, and everyone basically doesn't have any opinions on what he says.

So the matter was settled, and after Steiger reported the matter, the Ministry of Agriculture of Niger immediately began to arrange manpower to prepare to cooperate with their work.

"What kind of trees should I plant in Niamey?"

Lin Quan now has a problem, generally speaking, it is better to plant taller and denser trees in the sand-control forest, because the higher the trees, the better the effect.

Sand and dust is actually different from the general wind, there is sand in the dust, and the sand is relatively heavy, so when they move, there is always sand falling from the sky, and then there is also sand on the ground being swept up to the sky, so the weather in Sand City will get bigger and bigger after the desert, and finally it will become a sandstorm, and after leaving the desert, the sand and dust will get smaller and smaller, and finally disappear.

And because the sand is heavy and moves slowly, if the trees are high enough to intercept a huge part of the dust, the trees need to be relatively high.

The first thing that comes to mind is the poplar tree, which is very tall and has dense leaves, but their sand control effect does not seem to be as good as that of another tree, that is, the cypress tree in the coniferous forest!

Poplars are broad-leaved forests, and the leaves flutter with the wind, and the gaps will be larger, while cypress trees are coniferous forests, and when the wind blows, it is not the leaves that are shaking but the whole tree is shaking, but even so, the sand and wind are not easy to penetrate, and they have a strong windproof effect.

In this comparison, it seems that cypress trees are more suitable than poplar trees, but everything has two sides, as a coniferous forest growing in temperate or cold regions, the growth rate of cypress trees is relatively slow, and relatively speaking, the growth rate of aspen trees is undoubtedly much faster, and at present, for Niger, planting a sand-proof forest, naturally the sooner the effect is better, the longer the time drags on, the longer they need to endure, even if they can't completely help them solve the problem, As long as it can reduce some of the impact of wind and sand, it is good news for them.

If you plant cypresses, when they grow, it is estimated that it will take more than ten or twenty years, and the people of Niger must not have such a good patience to wait, so although cypress trees are good, they are not Lin Quan's first choice, and the first choice is poplar trees.

However, cypress trees can also be planted partially, if the budget is sufficient!