论文部分内容阅读
在川中丘陵区柏木低效人工林中,选择人工采伐形成的4种不同大小的林窗(50 m2、100 m2、150 m2、200 m2),以未改造的柏木纯林为对照,研究不同大小林窗内土壤理化性质、土壤动物群落数量和多样性特征情况.结果显示:150 m2林窗对土壤容重、总孔隙度、毛管孔隙度和土壤含水量改善效果最好,并且有利于土壤有机质、全磷和有效磷含量的积累;对照样地和4种不同面积林窗共捕获土壤动物3 072头,分属4门8纲23目41科,昆虫纲为优势种群,占类群总数的47.8%,其中150 m2林窗下土壤动物数量和多样性最高.土壤动物与环境因素相关分析表明,土壤含水量、毛管孔隙度、总孔隙度、水解氮和有效磷与土壤动物多样性关系密切.主成分分析表明,150 m2林窗对土壤理化性质和土壤动物多样性综合影响效果最好,其次是200 m2林窗和100 m2林窗,50 m2林窗的改良效果不明显.上述结果表明,林窗式改造对柏木低效林土壤理化性质、土壤动物群落数量和多样性特征产生了一定影响,并且随林窗面积的不同而发生变化;综合来看150 m2林窗的改造效果最佳.
In the low-efficiency plantations of Kashiwagi in hilly area of Sichuan Basin, we selected four different size gaps (50 m2, 100 m2, 150 m2 and 200 m2) formed by artificial cutting, The physical and chemical properties of soil, the numbers and diversity of soil animal community in Kobayashi show that: the 150 m2 gap can improve the soil bulk density, total porosity, capillary porosity and soil water content, and is beneficial to soil organic matter, Total phosphorus and available phosphorous content. In total, 3 072 soil animals were captured in the control plots and 4 different area gaps, belonging to 4 orders, 8 classes, 23 orders and 41 families. Insecta was the dominant species, accounting for 47.8% of the total. , Among which, the number and diversity of soil fauna under 150 m tree gap windows were the highest.The correlation analysis between soil fauna and environmental factors showed that soil water content, capillary porosity, total porosity, hydrolyzed nitrogen and available phosphorus were closely related to soil animal diversity. The composition analysis showed that 150 m2 forest window had the best combination of soil physical and chemical properties and soil animal diversity, followed by 200 m2 forest window and 100 m2 forest window, while the improvement effect of 50 m2 forest window was insignificant. The above results showed that forest Window type The transformation had certain influence on the soil physical and chemical properties, the number of soil animal community and the diversity characteristics of low-impact cypress wood, and varied with the area of the albedo. In conclusion, the transformation of the 150-m2 forest window was the best.