山丹县退化防护林分布特征及土壤状况分析

Analysis on Distribution Characteristics and Soil Conditions of Degraded Shelter Forests in Shandan County

山丹县防护林建设对县域发展做出了积极贡献,但受多种因素影响,近年来防护林出现大面积退化。以山丹县2022年森林资源和国土资源调查结果为依据,对县域内退化防护林进行全面调查,统计退化面积、林种类型、退化程度、分布特征等。结果表明:全县退化防护林面积达到4384.77 hm^(2),其中农田牧场防护林占80.59%,防风固沙林占19.41%;轻度退化8.28%,中度退化63.55%,重度退化28.17%;重度退化林地土壤有机质含量和养分指标含量显著低于中度和轻度退化林地(P<0.05),极显著低于未退化林地(P<0.01)。综合来看,山丹县退化防护林以中度退化为主,多为农田牧场灌木防护林,且退化程度越高,土壤状况越差,应结合调查结果及时开展精准修复。

Shelter forest construction in Shandan County has made positive contribution to county development,but affected by many factors,the shelter forests have been degraded in a large area in recent years.Based on the survey results of forest resources and land resources in Shandan County in 2022,a comprehensive survey was carried out on the degraded shelter forests in the county,and the degraded area,forest type,degradation degree and distribution characteristics were counted.The results showed as follows:the area of degraded shelter forests in the county reached 4384.77 hm^(2),of which farmland and pasture shelter forests accounted for 80.59%and windbreak and sand-fixing forests accounted for 19.41%;the mild degradation accounted for 8.28%,the moderate degradation accounted for 63.55%,and the severe degradation accounted for 28.17%;the soil organic matter content and nutrient index content of severely degraded forest land were significantly lower than those of moderately and mildly degraded forest land(P<0.05),and significantly lower than those of non-degraded forest land(P<0.01).In summary,the degraded shelter forests in Shandan County are mainly moderately degraded,mostly farmland and pasture shrub shelter forests.The higher the degree of degradation is,the worse the soil condition gets,and timely and accurate restoration should be carried out based on the investigation results.