广西石漠化地区土壤理化性质特征  

Characteristics of Soil Physical and Chemical Propeties in the Rocky Desertification Area of Guangxi

作　　者：邓利[1] 彭小裕 黎良财[1] Deng Li;Peng Xiaoyu;Li Liangcai(Guangxi Eco-engineering Vocational and Technical College,Liuzhou,Guangxi 545004,China)

机构地区：[1]广西生态工程职业技术学院,广西柳州545004

出　　处：《伊犁师范大学学报（自然科学版）》2022年第2期29-34,共6页Journal of Yili Normal University：Natural Science Edition

基　　金：广西林业厅项目(桂林办字〔2017〕12号).

摘　　要：依托广西岩溶地区第三次石漠化监测规划,采用野外取样调查和实验室检测分析方法,开展广西石漠化地区土壤理化性质及植被覆盖程度、地形因子对土壤肥力影响状况研究.结果表明:土壤主要为中壤土,多为偏碱性土,均为石灰土.随植被覆盖程度增加,土壤自然含水量、水解氮和速效钾含量表现为“N”字形变化,其中“N”字形的第二个拐点均出现在植被覆盖程度为30%~60%范围处,水解氮与植被覆盖程度成显著正相关.随着坡度增加,水解氮和速效磷总体呈现先降后升再降低的趋势.土壤自然含水量最大值出现在缓坡处且此处的pH值最低,土壤pH值与坡度呈显著正相关,与土壤自然含水量呈显著负相关.土壤自然含水量、水解氮、速效磷和pH值在上、中和下三种坡位处,其含量均呈现由少到多的增加趋势.Based on the third rocky desertification monitoring program in Karst areas of Guangxi,the field sampling survey and laboratory testing and analysis methods were adopted to study the effects of soil physical and chemical properties,vegetation coverage and topographic factors on soil fertility in rocky desertification areas of Guangxi.The results show that the soil is mainly middle loam,alkalescent soil and calcareous soil.With the increase of vegetation coverage,the content of natural water content,hydrolyzed nitrogen and available potassium in soil showed“N”shape changes,and the second inflectation point of“N”shape all appeared in the range of 30%-60%vegetation coverage,and there was a significant positive correlation between hydrolyzed nitrogen and vegetation coverage.With the increase of slope,hydrolyzed nitrogen and available phosphorus tended to decrease first,then to increase and then to decrease.The maximum natural water content of soil appeared on the gentle slope and the pH value was the lowest.There was a significant positive correlation between soil pH value and slope,and a significant negative correlation with soil natural water content.The content of soil natural water content,hydrolyzed nitrogen,available phosphorus and pH value increased from less to more in the upper,middle and lower slope positions.

关 键 词：石漠化地区 土壤理化性质 植被覆盖程度 坡度 坡位 

分 类 号：S715.4[农业科学—林学]