不同土地利用方式对喀斯特峰丛洼地土壤团聚体碳、氮、磷分布特征的影响

发布时间：2018-04-08 20:11

  本文选题：茂兰喀斯特　切入点：土地利用　出处：《江苏农业科学》2017年06期

【摘要】：以贵州茂兰喀斯特自然保护区耕地、退耕还草地、退耕还林地、灌丛和原生林为研究对象,研究不同土地利用方式对0~20 cm土层土壤团聚体有机碳、全氮、全磷的分布特征以及对团聚体中有机碳、全氮、全磷含量的影响。结果表明,与耕地相比,退耕还草地、退耕还林地、灌丛和原生林明显提高了原状土壤及各粒径团聚体土壤有机碳、全氮的含量,而全磷含量则相反;随着粒径的逐渐减小,有机碳、全氮含量在0.25~0.50 mm粒级团聚体中最高。相关分析表明,土壤有机碳、全氮含量均与5、2~5、1~2、0.25~0.50、≤0.25 mm粒级团聚体之间呈极显著相关关系,其中与5粒级团聚体呈极显著负相关,而与0.5~1.0 mm粒级团聚体不相关;全磷含量与有机碳、全氮含量及2~5、0.25~0.50 mm粒级呈极显著负相关,与5、2~5 mm粒级团聚体呈显著相关,而全磷含量与0.5~1.0 mm、≤0.25 mm粒级团聚体间不相关。
[Abstract]:Using cultivated land, grassland, shrub and native forest in Maolan Karst Nature Reserve, Guizhou Province as the research object, the soil aggregate organic carbon and total nitrogen in 0 ~ 20 cm soil layer were studied by different land use methods.Distribution of total phosphorus and its effect on organic carbon, total nitrogen and total phosphorus content in aggregates.The results showed that, compared with cultivated land, returning farmland to grassland, returning cropland to forest, shrub and native forest significantly increased the contents of organic carbon, total nitrogen and total phosphorus in undisturbed soil and aggregates of various particle sizes, but the total phosphorus content decreased gradually with the grain size decreasing.The content of organic carbon and total nitrogen was the highest in 0.25m 0.50mm agglomerates.Correlation analysis showed that soil organic carbon and total nitrogen content were significantly correlated with 0.25 0.50, 鈮，

本文编号：1723156