Spatial Variability of Soil Organic Carbon Under Maize Monoculture in the Song-Nen Plain,Northeast C

来源 :土壤圈(意译名) | 被引量 : 0次 | 上传用户:ggb1977
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Soil organic carbon (SOC) and its relationship with landscape attributes are important for evaluating current regional,continental,and global carbon stores.Data of SOC in surface soils (0-20 cm) of four main soils,Cambisol,Arenosol,Phaeozcm,and Chernozem,were collected at 451 locations in Nongan County under maize monoculture in the Song-Nen Plain,Northeast China.The spatial characteristics of soil organic carbon were studied,using geographic information systems (GIS) and geostatistics.Effects of other soil physical and chemical properties,elevation,slope,and soil type on SOC were explored.SOC concentrations followed a normal distribution,with an arithmetic mean of 14.91 g kg~(-1).The experimental variogram of SOC was fitted with a spherical model.There were significant correlations between soil organic carbon and bulk density (r=-0.374~(**)),pH (r=0.549~(**)),total nitrogen (r=0.781~(**)),extractable phosphorus (r=-0.109~*),exchangeable potassium (r=0.565~(**)),and cation exchange capacity (r=0.313~(**)).Generally,lower SOC concentrations were significantly associated with high elevation (r=-0.429~(**)).Soil organic carbon was significantly negatively correlated with slope gradient (r=-0.195~(**)).Samples of the Cambisol statistically had the highest SOC concentrations,and samples of the Arenosol had the lowest SOC value.
其他文献
采用溶胶-凝胶法制备了PbF2·SiO2纳米晶玻璃陶瓷块体;利用TG-DSC和IR技术分析了干凝胶在热处理过程中有机基团的分解及内部原子键合方式的演变;结合XRD和TEM研究了凝胶玻璃
程序代码中蕴含着软件开发人员最原始的开发理念、设计思想和编程习惯等信息,将数据挖掘用于分析处理这种编码痕迹以便提取出潜藏着的有用知识是一个有着广阔前景的新的研究
目的 在北京大学医学物理和工程实验室研发的一个基于平板探测器的锥形束X线计算机断层扫描成像装置和单光子发射计算机断层扫描成像组成的双模态小动物成像系统中,提出一种
为了改善CoFe2O4的磁性能,以柠檬酸、硝酸钴、硝酸铁为原料,用低热固相反应与sol-gel法相结合,制备了CoFe2O4晶体(样品).借助于热分析、XRD、SEM和振动样品磁强计(VSM)等测试
采用AlCl3-NaCl熔盐置换扩散工艺在AZ91D镁合金表面制备了镁铝金属间化合物涂层,并利用扫描电镜和XRD时镁铝金属间化合物进行表征.结果表明,熔盐自发置换扩散铝涂层在400℃、
儿童语言能力包括语言理解、构音能力、语言表达和交流等,评价儿童语言的发展也要从这几个方面入手。传统的智力测试均包括语言内容,但也有一些专门测试语言的方法。测试语言
The cationic ring-opening polymerization of 1-azabicyclo[4.2.0]octane,commonly called conidine(1)was studied with some chiral tricyclic amino acid esters(6a-6f)
开鲁盆地陆西凹陷是一个典型的中生代单断箕状盆地,充填了厚达3 000余米的下白垩统并表现出良好的沉积旋回特征.依据钻井取心资料、测井和地震资料以及分析化验资料,将下白垩
Adsorption and desorption are important processes that influence the transport,transformation,and bioavailability of hexachlorobenzene (HCB) in soils.To examine