江西省红砂岩地退化过程中土壤理化性质的变化特征  

Variation Characteristics of Soil Physical and Chemical Properties During Red Sandstone Land Degradation in Jiangxi Province

作　　者：杨明[1] 董星宇 郭晓敏[1] 兰龙焱 牛德奎[1] YANG Ming;DONG Xing-yu;GUO Xiao-min;LAN Long-yan;NIU De-kui(College of Forestry/Key Laboratory of Forest Cultivation,Jiangxi Agricultural University,Nangchang Jiangxi 330045,P.R.China;Yuanzhou District Forestry Bureau,Yichun Jiangxi 336000,P.R.China)

机构地区：[1]江西农业大学林学院/森林培育重点实验室,江西南昌330045 [2]江西省宜春市袁州区林业局,江西宜春336000

出　　处：《西部林业科学》2022年第5期68-74,共7页Journal of West China Forestry Science

基　　金：国家自然科学基金项目(31360177,31560150);江西省草地常规监测项目(20201125)。

摘　　要：以江西省不同退化程度(潜在退化、轻度退化、中度退化、重度退化及极度退化)的红砂岩地为研究对象,采集5个红砂岩退化地区(赣东、赣南、赣北、赣中、赣西)的土壤样品,应用空间代替时间的方法,研究红砂岩地不同退化等级下土壤理化性质的变化特征。结果显示:(1)随着土壤退化程度加剧,土壤砂粒含量逐渐增多,由潜在退化的(52.17±9.43)%增大到重度退化的(72.44±1.55)%;土壤粉粒含量、黏粒含量、土壤含水率、总孔隙度、毛管孔隙度、饱和持水量、毛管持水量、有机质、磷素、磷素含量随着退化程度的加深逐渐减少;pH变化差异不显著,土壤呈酸性;与潜在退化土壤相比,轻度、中度和重度退化的土壤总孔隙度分别减小2.29%、36.34%和45.59%;土壤饱和持水量分别减小12.34%、45.11%和54.46%;土壤有机质含量分别减小53.41%、72.69%、77.72%和86.08%,土壤全磷含量分别减小2.44%、39.02%、41.46%和42.68%。(2)通过相关性和主成分分析,不同退化程度下土壤有机质、磷素、饱和持水量、总孔隙度是土壤理化性质的重要因子,是评价土壤退化程度的关键指标。(3)红砂岩土壤退化程度:江西北部高于南部,东部退化程度高于西部,北部和东部红砂岩退化程度较南部和西部严重,南部地区最弱。研究结果为今后红砂岩地区土壤质量的改善和生态系统恢复重建提供理论支撑和依据。Taking the red sandstone lands with different degrees of degradation(potential degradation,light degradation,moderate degradation,severe degradation and extreme degradation)in Jiangxi Province as the research object,the soil of five red sandstone degradation areas in Jiangxi Province(Eastern Jiangxi,southern Jiangxi,northern Jiangxi,central Jiangxi and western Jiangxi)were selected for field sample collection and indoor sample analysis to study the change characteristics of soil physical and chemical properties under different degradation levels of red sandstone land.The results showed that:(1)With the aggravation of soil degradation,the content of soil sand increased gradually,from(52.17±9.43)%of potential degradation to(72.44±1.55)% of severe degradation;Soil silt content,clay content,soil moisture content,total porosity,capillary porosity,saturated water holding capacity,capillary water holding capacity,organic matter,phosphorus and phosphorus content decreased with the deepening of degradation;There was no significant difference in pH change,and the soil was acidic;Compared with potential degradation,the total porosity of light,moderately and severely degraded soil decreased by 2.29%,36.34% and 45.59% respectively;Soil saturated water capacity decreased by 12.34%,45.11% and 54.46% respectively;The content of soil organic matter decreased 53.41%,72.69%,77.72% and 86.08% respectively,and the content of soil total phosphorus decreased 2.44%,39.02%,41.46% and 42.68% respectively;(2)Through correlation and principal component analysis,soil organic matter,phosphorus,saturated water holding capacity and total porosity are important factors of soil physical and chemical properties and key indicators to evaluate the degree of soil degradation;(3)The degradation degree of red sandstone soil in the north of Jiangxi is higher than that in the south,the degradation degree in the East is higher than that in the west,the degradation degree of red sandstone in the north and East is more serious than that in the South and W

关 键 词：红砂岩 土壤退化 土壤理化性质 影响因素 

分 类 号：S714[农业科学—林学]