四川省人工防护林退化研究

A Study of Man-made Shelter Forest Decline in Sichuan Province

防护林是四川主要林种,面积达全省一半以上。四川人工防护林面积占防护林面积的17.33%,以有林地为主,优势树种以柏木为主。本文在结合四川人工防护林的特点和退化防护林的定义,分析评价四川人工防护林退化的主要指标以及程度,得出四川人工防护林退化面积44.85万hm2,蓄积4 526.86万m3,并从自然因素、经营技术、社会因素分析其退化原因。

Shelter forest is one of the main forest categories in Sichuan Province, occupying an area of more than half of all forests. Its dominant tree species is cypress and its area accounts for 17.33% of the total shelter forest area. Based on the features of man-made shelter forest and the definition of the shelter forest decline, in the paper studies were made of an assessment index system and the degree system of man-made shelter forest decline in Sichuan province. Through analysis, man-made shelter forest decline area was 448.5 thousand hectares and its volume was 45 million 268 thousand and 600 cubic metres in Sichuan province. Finally, analysis was made of the causes of man-made shelter forest decline from natural factors, social factors and management technology.