摘要
利用空间分布代替时间序列的方法,通过建立无退化、潜在退化、轻度退化、中度退化和重度退化5种不同退化程度石灰土的样地,并采集土壤剖面,分析对比了不同退化程度石灰土剖面有机碳和养分含量分布特征。结果表明:不同退化程度石灰土有机碳(SOC)含量与有机碳密度(SOC_i)与土层深度存在极显著负相关关系,即随土层深度增加而降低;轻度退化程度石灰土平均有机碳含量和碳密度最高;不同退化程度石灰土全氮(TN)和碱解氮(AN)含量剖面变化趋势与SOC相似,与土层深度呈极显著负相关性;全磷(TP)和全钾(TK)含量随土层深度的增加而无明显变化,速效磷(AP)和速效钾(AK)含量均随土层深度增加而降低,但均与土层深度无显著相关性;不同退化程度石灰土的C∶N均低于15,说明有机质的分解较容易;5种退化程度石灰土中,SOC和氮素均存在极显著相关关系,与其他养分之间相关性有所差异。
By means of spatial distribution instead of time series,sample plots of lime soils with five different degrees of degradation,such as no degradation,potential degradation,light degradation,moderate degradation and severe degradation,were established.Soil profile samples were collected,and the distribution characteristics of organic carbon and nutrient contents in different degraded soil profiles were analyzed.The results showed that the content of organic carbon(SOC)and organic carbon density(SOC_i)were significantly negatively correlated with soil depth(p<0.01),i.e.SOC and SOC_i decreased with the increase of soil depth;the average organic carbon content and carbon density of lime soil under light degradation degree were the highest;the change trend of total nitrogen and available nitrogen content of lime soil under different degradation degree were similar to that of SOC,and had a very significant negative correlation with soil depth(p<0.01);the content of total phosphorus and total potassium did not change obviously with the increase of soil depth,and the content of available phosphorus and available potassium decreased with the increase of soil depth,but no significant correlation was found between those nutrient contents and soil depth,respectively;The C∶N of lime soil under different degrees of degradation was less than 15,indicating that the organic matter is readily decomposed.There was a significant correlation between SOC and nitrogen in the five degraded lime soils(p<0.01),and the correlation with other nutrients was different.
作者
何铁光
俞月凤
蒙炎成
苏天明
胡钧铭
杜虎
王瑾
李忠义
张野
韦彩会
范适
HE Tieguang;YU Yuefeng;MENG Yancheng;SU Tianming;HU Junming;DU Hu;WANG Jin;LI Zhongyi;ZHANG Ye;WEI Caihui;FAN Shi(Agricultural Resources and Environment Research Institute,Guangxi Academy of Agricultural Sciences,Nanning530007,China;Institute of Subtropical Agriculture,Chinese Academy of Sciences,Changsha410125,China;Landscape College,Hunan Polytechnic of Environment and Biology,Hengyang,Hunan421005,China)
出处
《水土保持研究》
CSCD
北大核心
2019年第4期13-18,共6页
Research of Soil and Water Conservation
基金
国家自然科学基金(31460135)
广西第十八批“十百千人才工程”专项资金
广西农业科学院科技发展资助项目(桂农科2017JM08,桂农科2015JZ17)
关键词
有机碳
剖面分布
石灰土
喀斯特
soil organic carbon
profile distribution
lime soil
karst
