以豫南山区20年生的不同林分类型为研究对象，通过野外调查和室内分析，对林地地表层细根结构参数和土壤理化特性指标以及两者之间的关系进行研究。结果表明：麻栎—马尾松混交林土壤全氮质量分数、有效氮质量分数和有机质质量分数均高于麻栎林和马尾松纯林，且主要集中在林地0～10 cm土层中；各根系结构参数值均随土层深度增加而减少；根质量密度最大的林分类型为马尾松纯林，达到2．268 mg· cm－3；各林分类型林地表层的根系以直径在0．3～0．7 mm的细根为主。土壤有机质质量分数和土壤有效氮质量分数均与根质量密度、根长密度、根表面积密度和根体积密度存在显著的相关关系（ P＜0．05）；土壤密度与根系结构参数存在不显著的负相关关系（ P＞0．05）；三次曲线能很好的拟合土壤有效氮质量分数与根长密度、根表面积密度、根体积密度的关系，而对土壤有机质质量分数和根系各参数拟合效果较好的是幂函数或S形曲线。%We analyzed data from 20-year different forests types in southern mountains of Henan Province by using sampling and laboratory analysis methods to study the values and relationships between the root structural parameters , and soil physical-chemical characteristics of near-surface.The contents of soil total nitrogen , available nitrogen and organic matter of Quercus acutissima-Pinus mas onina a mixed forest were better than those of Quercus acutissima forest and Pinus massoniana forest, and were mainly distributed in 0-10 cm depth, and all values of root structural indicators decreased with soil depth .The value of root biomass in Quercus acutisis ma-Pinus masos niana mixed forest was 2.268 mg· cm-3 , largest than the other for-est types, and the roots of near-surface were fine roots with the average root diameters of 0.3-0.7 mm.Soil organic matter and soil available nitrogen had significant correlation with root length density , root surface area density and the volume den-sity ( P0.05) , and cubic model could fit the relation of the available nitrogen with soil volume density well , soil root length density and root surface area density , while soil organic matter and root parameters were better fitted with a power function and S-shaped curve.
展开▼
