不同发育阶段杉木人工林土壤团聚体分布特征及其稳定性研究

发布时间：2019-04-12 19:54

【摘要】：为研究杉木人工林土壤团聚体分布特征及其稳定性,探索杉木人工林土壤结构状况,以不同发育阶段杉木人工林0—100cm土层为研究对象,采用干筛法测定土壤团聚体组成,采用湿筛法测定团聚体稳定性,结果表明:在干筛处理下,各发育阶段杉木人工林土壤团聚体以大团聚体(0.25mm)为主,大团聚体比例皆达80%以上,中龄林和成熟林土壤大团聚体比例在各土层中均高于幼龄林,且在0—20cm土层差异显著(P0.05);在各土层中,不同发育阶段杉木人工林5mm粒径的土壤团聚体皆占较高比例,且不同发育阶段对5mm粒径的土壤团聚体组成比例有显著影响。在湿筛处理下,各发育阶段水稳性大团聚体(0.25mm)比例随土层加深而显著降低,0—80cm各土层内,中龄林和成熟林土壤水稳性团聚体比例高于幼龄林,且在0—20cm和20—40cm土层中龄林比幼龄林分别高41.79%和39.06%,差异显著;各发育阶段杉木人工林土壤团聚体破坏率(PAD)特征与水稳性大团聚体相反;平均重量直径(MWD)和平均几何直径(GMD)随土层加深而显著下降,其中中龄林和成熟林土壤团聚体GMD在0—100cm各土层内均显著高于幼龄林。据此认为,杉木人工林土壤团聚体稳定性随土层加深而降低,中龄林和成熟林土壤结构优于幼龄林。
[Abstract]:In order to study the distribution and stability of soil aggregates in Chinese fir plantation and to explore the soil structure of Chinese fir plantation, the composition of soil aggregates in 0-100cm soil layer of Cunninghamia lanceolata plantation at different development stages was determined by dry sieving method. The stability of aggregates was determined by wet sieving method. The results showed that the soil aggregates of Chinese fir plantation were mainly macroaggregates (0.25mm) under dry sieving treatment, and the proportion of macroaggregates was more than 80%. The ratio of soil macroaggregates in middle-aged forest and mature forest was higher than that in young forest in each soil layer, and the difference in 0-20cm soil layer was significant (P0.05). In different soil layers, the proportion of soil aggregates with 5mm particle size in different development stages of Cunninghamia lanceolata plantation was higher, and the composition ratio of soil aggregates with 5mm particle size was significantly influenced by different developmental stages of Cunninghamia lanceolata plantation. Under wet screen treatment, the ratio of water-stable macroaggregates (0.25mm) decreased significantly with the deepening of soil layer, and the ratio of water-stable aggregates in middle-aged forest and mature forest was higher than that in young forest in each layer of 0-80cm, and the percentage of water-stable aggregate in middle-aged and mature forest was higher than that in young forest. Moreover, in 0-20cm and 20-40cm soil layers, the age forest was 41.79% and 39.06% higher than that of the young forest, respectively, and the difference was significant. The (PAD) characteristics of soil aggregate failure rate of Cunninghamia lanceolata plantation at different development stages were opposite to those of water-stable macroaggregates. The mean weight diameter (MWD) and the average geometric diameter (GMD) decreased significantly with the deepening of soil layer, and the GMD of soil aggregates in the aged and mature forests was significantly higher than that in the young ones in all soil layers of 0-100cm. It was concluded that the soil aggregate stability of Chinese fir plantation decreased with the deepening of soil layer, and the soil structure of middle-aged forest and mature forest was better than that of young forest.
【作者单位】：福建农林大学林学院;国家林业局杉木工程技术研究中心;
【基金】：国家重点研发计划项目(2016YFD0600301) 福建农林大学科技创新专项(KF2015034)
【分类号】：S714.2

【相似文献】