The ecological role of castor
Ecological role
Soil and water conservation
China has about 320 million acres of sloping land, while the southern part of the country occupies about 160 million acres of land, accounting for 50% of the country. China's sloping farmland has a wide distribution, large area, and high sediment yield. The management of the southern sloping arable land mainly adopts the engineering measures of “slope changing laddersâ€. The investment per mu is at least 1,000 to 3,000 yuan, and the national financial resources cannot be fully solved within a limited time.
Ramie has a long history of planting in the southern sloping fields. Because of its flourishing foliage and well-developed root systems, the effect of controlling soil erosion is remarkable. From 1986 to 1989, the observation of ramie soil and water conservation was carried out. The observation result was: Planting first. In the year, the runoff coefficient and erosion intensity were basically the same between the farmland of the slope and the original slope; from the second year of planting the castor, both the gentle slope and the steep slope, the annual runoff coefficient was less than 0.06, and the annual soil erosion intensity was less than 19t/km2, is a slight erosion, so ramie has a very good effect to keep water and soil.
At the same time, it is also an excellent economical plant that can be used to develop hemp textiles. Ramie is a cost-saving macro, ecological and economical benefit coexistence of the southern plowing, and it also meets China's national power plant measures, and has broad prospects for promotion.
Reduce soil erosion
The experimental observation data of Wumu Beach soil and water conservation station in Dazhu County in the central basin of the basin showed that the amount of soil erosion decreased from moderate to slight in the first year of planting ramie and in the fifth-degree slope farmland. The annual soil erosion per square kilometer fell from 4095 tons to 210 tons (95% drop), which is the allowable loss (less than or equal to 500) range: from the second year, the annual soil erosion amount is close to zero.
In the first 15 years of sloping arable land, the amount of soil erosion was reduced from extremely strong to light, with a drop of three levels. The annual soil erosion per square kilometer decreased from 11,040 tons to 725.4 tons, a decrease of 93.4%; In the second year, the annual soil erosion per square kilometer was less than 6 tons. In the first 25 years of sloping arable land, in the first year of planting ramie, the amount of soil erosion dropped sharply to intensity, falling by two levels. The annual amount of soil erosion per square kilometer fell from 19,725 tons to 5,529 tons, a drop of 72%; from the second year At the beginning, the annual soil erosion per square kilometer is below 20 tons.
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