摘要
分析了宜昌13个典型土壤剖面土壤有机质、全氮、全磷的含量及其与环境因子的相关关系。结果表明,宜昌土壤表层有机质、全氮、全磷含量表现出显著的水平分异特征,并且在10~20 cm土层变异性达到最大,变异系数分别为94.2%、72.6%、63.1%。整体上各土层土壤养分变异系数随剖面深度增加呈减小的趋势。大部分土壤全氮与有机质的消长趋势基本一致,并表现出从表层往下减少的趋势,尤其以黄棕壤与棕壤最为典型,全磷沿土壤剖面没有明显的变化规律。棕壤、黄棕壤和水稻土的有机质、全氮含量较为丰富,主要与地表植被、气候条件、土壤结构、人工有机肥料投入等因素有关。土壤有机质、全氮均与土壤含水量呈显著正相关,与土壤容重呈显著负相关,与土壤质地没有明显相关性。土壤全磷含量与土壤有机质、全氮含量没有明显相关性,主要与土壤母质磷素矿物含量及土壤自身的发育过程有关。黄壤与红壤的土壤养分含量较低,与土壤自身发育过程及不合理的开发利用活动有关。
Based on the data from 13 typical soil sampling sites in Yichang district,the contents of soil organic matters(SOM),total nitrogen(TN) and total phosphorus(TP) and their influencing factors were studied.The results showed that the contents of SOM,TN and TP of soil in the surface layer had a significant variation in horizontal distribution.The variation in the 10~20 cm depth reached a maximum and the variation coefficients of SOM,TN,and TP were 0.942,0.726 and 0.631,respectively.On the whole,variation of each soil layer showed a declining trend with the increase of soil depth.TN and SOM had a similar changing tendency in most of the soil types and their profile distribution generally presented a declining trend from top to bottom,especially for the yellow brown soil and brown soil.However,there was no markedly changing law in the profile distribution of TP.Brown soil,yellow brown soil and paddy soil had relatively high contents of SOM and TN,which had been attributed to a variety of factors including vegetation,climate,soil structure and application of fertilizer.Both SOM and TN had a significant positive correlation with soil moisture,a significant negative correlation with soil volume weight,and no marked correlation with soil texture.The content of TP,had no significant correlation with that of SOM and TN,it was cottributed to the content of TP in phosphorus mineral and the development process of soil.The low nutrient content in yellow and red soil could be attributed to the soil growth process and unreasonable land utilization.
出处
《湖北农业科学》
北大核心
2012年第24期5628-5632,共5页
Hubei Agricultural Sciences
基金
2012年宜昌市科学技术研究与开发项目(A2012-304)
关键词
土壤养分
有机质
全氮
全磷
相关分析
宜昌
nutrient in soil
soil organic matters
total N
total P
correlation analysis
Yichang
