Low-density planting method for rain-fed haloxylon ammodendron sand-fixation forest

Abstract

The invention discloses a low-density planting method for a rain-fed haloxylon ammodendron sand-fixation forest. The low-density planting method for the rain-fed haloxylon ammodendron sand-fixation forest comprises the following steps: 1) haloxylon ammodendron afforestation: (1) seedling selection, (2) hole digging, (3) seedling planting, and (4) water replenishing; 2) sand barrier arrangement: after afforestation is completed, arranging a sand barrier which is an equilateral triangle with the specification of 3 m on the outer periphery of each bushwood, arranging fixing piles at intervals of1 m, smashing the fixing piles into the ground by 20-30 cm with a hammer, and finally, firmly fixing plastic nets which are equilateral triangles on the sand surface. A combined body is formed by tussocky haloxylon ammodendron and the plastic net sand barriers, a plurality of combined bodies form a whole body, when passing, wind and running sand are forced to flow around the whole body, the wind speed is reduced, the running sand and fine particulate matters are accumulated in the bushwood and on the periphery of the bushwood, a geomorphologic landscape with uniformly distributed bushwood andbare patches is formed, limited nutrients and water resources are centralized under the bushwood to ensure stable and healthful growth of the haloxylon ammodendron sand-fixation forest, and double purposes of wind prevention and sand fixation and ecological restoration are achieved.

Description

Technical field [0001] The invention belongs to the technical field of desertification prevention and control, and in particular relates to a low-density establishment method of rain-fed Haloxylon ammodendron sand-fixing forest. Background technique [0002] my country is one of the countries seriously affected by desertification in the world. The country’s desertified land area is 1,721,200 square kilometers, accounting for 17.93% of the total land area. Land desertification is currently the most serious ecological problem, which seriously threatens national ecological security and restricts social economy. sustainable development. The construction of artificial sand-fixing forests is the main measure for the restoration of vegetation in sandy areas and the prevention of the expansion of land desertification. my country has nearly 60 years of history of artificial sand-fixing vegetation construction, which has effectively curbed the development of desertification and promoted the...

AI Technical Summary

Problems solved by technology

In the previous practice of sand fixation and afforestation, Haloxylon planting at intervals of 1×1m, 1×2m, and 2×2m was used to quickly fix quicksand. This mode has the following disadvantages: (1) Due to the rapid decline of groundwater level However, it cannot be used, and only limited precipitation is used to maintain growth. The density of afforestation is high, and the soil moisture is seriously insufficient; (2) the sand surface is stable after afforestation, and the leaching process of rainfall and dustfall promotes the formation of physical crusts on the sand surface, making it difficult for rainfall to Infiltration into the deep layer, the shallow layer of soil moisture is serious, the root system of Haloxylon is deep, it is difficult to make full use of rainfall to replenish the moisture in the soil; (3) stable sandy surface and shallow soil moisture are conducive to the growth of annual herbs , a large number of annual herbs compete with Haloxylon for water resources

Other sand fixation measures are engineering auxiliary measures + Haloxylon planting mode. Engineering auxiliary measures mainly include: clay ribbon sand barrier, grass grid sand barrier, plastic / nylon mesh grid sand barrier, etc. The disadvantages of these measures are: ( 1) The cost of sand fixation is high, and it is difficult to implement in a large area; (2) The stable sand surface forms a physical crust, which makes it difficult for rainfall to infiltrate, and the utilization rate of rainfall by Haloxylon is not high; (3) The timeliness of the sand barrier is short, and the sand barrier is aging Severe wind erosion

The disadvantage of this sand-fixing measure is that the density of afforestation per unit area in the forest belt area is high. As the sand-fixing forest grows, the water resources are insufficient. At the same time, when the windy and dusty weather occurs, when the airflow encounters a relatively dense forest belt, part of the airflow will rise upwards. , the other part of the airflow sinks to the roots of the trees with relatively sparse branches and leaves, the wind erosion under the clusters is intensified, and the soil nutrients and water are lost, resulting in the degradation of the sand-fixing forest and the reduction of its protection ability

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