Method for acquiring basin coverage rate for water conversation

Abstract

The invention provides a method for acquiring a basin coverage rate for water conversation. The method includes the steps: 1) according to four stand types, including coniferous forest, broad-leaved forest, mixed broadleaf-conifer forest and shrubbery, of a basin forest, measuring area, canopy interception rate, saturated soil water-holding capacity and the like of each stand type; 2) superposing according to respective weights to acquire coverage area, capable of realizing water conservation, of one stand type, and determining a coverage rate of each stand for water conservation; 3) fitting to acquire a basin coverage rate used for water conservation. According to the method, the forest coverage rate of a basin for water conservation is obtained by combination of years' precipitation data of the studied basin according to forest area and forest types of a surface water basin, under the guidance of the coverage rate, reasonable planning and purposeful afforestation or deforestation are performed, a water conservation function of forests is developed fully, suitable forest area of the basin is regulated in real time, blind afforestation is avoided, the contradiction of the forests and farmland is alleviated, and the method has great economic significance.

Description

technical field [0001] The invention belongs to the field of area measurement, and in particular relates to a forest area measurement method for water conservation. Background technique [0002] Water conservation is one of the important ecological service functions of forest ecosystems. Taking Henan Province as an example, in 2007, the functional value of forest water conservation accounted for 27% of the total forest service value in the province, ranking first among the eight major forest service function values. It can be seen that forests play an irreplaceable role in water conservation. Relevant studies have shown that in recent years, the shortage of water resources and the ecological and environmental problems it has caused have become one of the most urgent problems to be solved in China. Among them, the reduction of incoming water in mountainous areas and the serious attenuation of water resources are the important reasons for the shortage of water resources. one...

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Problems solved by technology

[0004] In the prior art, the method of determining the suitable watershed coverage rate is usually determined by experience or scenario simulation methods, and only the single forest coverage rate value of the watershed for many years is obtained, ignoring the fact that the water conservation function of different forest vegetation types varies with the size of the forest. The change of age has been unable to meet the needs of long-term planning of watershed land use

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