不同发育阶段杉木人工林土壤有机质特征及团聚体稳定性

发布时间：2017-12-27 08:12

本文关键词：不同发育阶段杉木人工林土壤有机质特征及团聚体稳定性　出处：《生态学杂志》2016年08期 　论文类型：期刊论文

【摘要】：为比较不同发育阶段杉木人工林土壤团聚体稳定性和有机质变化规律,选取杉木幼龄林、中龄林和成熟林为对象,研究不同发育阶段杉木林土壤总碳、总氮、可溶性有机质、微生物生物量、团聚体分布和稳定性。结果表明:随着林分的发育,表层土壤总氮含量呈增加趋势,总碳先减少后增加,3个发育阶段20~100 cm土层的总碳变化不大。可溶性有机质含量和微生物生物量均随土壤加深而显著下降,0~20 cm土层可溶性有机碳含量随着林龄增加而下降,中龄林微生物生物量碳明显低于幼龄林和成熟林,活性有机质与土壤总碳、总氮、土壤容重、p H值和含水量均存在不同程度相关关系,说明杉木人工林土壤活性有机质含量受多个土壤因素的影响。5 mm大团聚体数量和平均重量直径随林分发育呈增加趋势,团聚体破坏率下降。团聚体的稳定性随土层加深而显著下降,中龄林和成熟林深层土壤0.25 mm水稳性团聚体比例、平均重量直径、几何重量直径均大于幼龄林,团聚体破坏率低于幼龄林,表明杉木林分的发育有利于底层土壤结构的稳定。土壤团聚体稳定性与土壤粉粒含量、活性有机碳组分、总碳、总氮呈显著正相关。杉木人工林发育到成熟林阶段,土壤碳和氮得到积累,土壤团聚体稳定性显著提高。
[Abstract]:To compare the different stages of Chinese fir plantation soil aggregate stability and organic matter changes and development, selection of young Chinese fir plantation, forest and mature forest as the object of study, different developing stages of Chinese fir forest soil total carbon, total nitrogen, soluble organic matter, microbial biomass, aggregate distribution and stability. The results showed that the total nitrogen content of surface soil increased with the growth of stand, and the total carbon decreased first and then increased. The total carbon of 20~100 cm soil layer changed little during the 3 development stages. Soluble organic matter content and microbial biomass were significantly decreased with the increase of soil depth, soil soluble organic carbon content of CM 0~20 decreased with age increasing, the microbial biomass carbon in forest was significantly lower than that of young forest and mature forest, and water content were correlated in different degrees of active organic matter and total carbon, total nitrogen, soil the soil bulk density, P value of H, indicating that the soil labile organic matter content of Chinese fir plantations is affected by soil factors. The number of 5 mm large aggregates and the average weight diameter increased with the growth of the stand, and the aggregate destruction rate decreased. Aggregate stability decreased with the increase of soil depth, the middle age forest and mature forest soil of 0.25 mm water stable aggregate ratio, mean weight diameter, geometric weight diameter than the young forest, aggregate destruction rate is lower than that of young forest, Chinese fir forest development is conducive to the bottom soil structure stability. The stability of soil aggregates was significantly correlated with the content of soil powder, active organic carbon, total carbon and total nitrogen. Cunninghamia lanceolata plantation was developed to mature forest stage, soil carbon and nitrogen were accumulated, and soil aggregate stability increased significantly.
【作者单位】：福建农林大学林学院;福建农林大学莘口教学林场;
【基金】：国家科技支撑计划子课题(2015BAD09B010102) 国家自然科学基金项目(31370531;U1405211)资助
【分类号】：S714.2
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