Water conservation forest density configuration method based on soil moisture vegetation carrying capacity

Abstract

The invention discloses a water conservation forest density configuration method based on soil moisture vegetation carrying capacity. The method comprises following steps of 1) determining soil effective water capacity under slope specific site condition; 2) determining the relation between specific standing forest annual evapotranspiration and the biggest leaf area index (LAI) within the year; 3) determining the relation between the soil thickness and the LAI under the specific site condition; and 4) according to the relation between the LAI of the standing forest and the density (or cover degree) thereof, solving the proper density (or cover degree) of the standing forest. According to the invention, limitations in barren mountain forestation practice where the local annual precipitation is taken as the sole key factor are overcome; the dynamic relation between soil moisture supplying and moisture consumption of trees at different ages is also considered; and the result can be directly applied or popularized to operation and management practices of water conservation forest in semiarid and semihumid mountainous areas in northern China.

Description

technical field [0001] The invention relates to a water source conservation forest density allocation method based on soil water vegetation bearing capacity, in particular to a water source conservation forest density allocation method in semi-arid and semi-humid mountainous areas in northern my country. Background technique [0002] In the semi-arid and semi-humid northern mountainous areas of my country, water is the limiting factor that determines the growth, distribution and success of afforestation, while the soil moisture and vegetation carrying capacity is the core and key to maintain the healthy growth of trees and determine the reasonable density of forest stands . [0003] In the practice of afforestation on barren hills in the past few decades, because the limitation of soil water availability on tree growth and the water balance of forest land were not fully considered, the forest land density was too large or the forest land soil was caused by the growth of trees...

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Problems solved by technology

In the silvicultural practice of water conservation forests in northern my country and the research on the carrying capacity of soil moisture and vegetation, more emphasis is placed on the limiting effect of the average annual rainfall (400 mm) in the watershed on tree growth and afforestation, without considering the mountainous area under the given rainfall conditions The influence of slope site factors (such as soil thickness) on soil effective water capacity rarely involves the dynamic relationship between soil water supply and water consumption of trees of different ages, which makes it difficult to directly apply and extend theoretical results to specific sites in mountainous areas Forest stand management and management in production practice

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