喀斯特坡耕地不同微地貌土壤养分效应  

Effects of Different Karst Slope Farmland Microtopography on Soil Nutrients

作　　者：李昌兰[1] 戴全厚[1] 程富东[1] 

机构地区：[1]贵州大学林学院,贵阳550025

出　　处：《中国农学通报》2015年第14期219-225,共7页Chinese Agricultural Science Bulletin

基　　金：国家自然科学基金"喀斯特坡耕地土壤养分地下孔(裂)隙流失特征与机理"(41461057);国家"十二五"科技支撑计划"草海湿地生态系统恢复与重建关键技术研究与示范"(2011BAC02B02);贵州省重大应用基础专项"喀斯特石漠化生态修复及生态经济系统优化调控研究"(黔科合JZ字[2014]2002);贵州省喀斯特生态与环境专业学位研究生工作站(贵州省教育厅;2014);贵州省社发攻关项目"铅锌矿;矿山废弃地植被恢复技术研发与示范"(黔科合SZ[2009]3003)

摘　　要：为探索喀斯特坡耕地不同微地貌类型与土壤养分间的相互关系,采用网格取样法对不同微地貌土壤养分进行了研究。结果表明,不同微地貌下土壤主要养分含量不同,土壤有机质平均含量的变化范围为61.14~191.34 g/kg,土壤全氮平均含量的变化范围是1.50~3.58 g/kg,土壤全磷平均含量的变化范围为0.67~1.31 g/kg,土壤全钾平均含量的变化范围为13.7~36.4 g/kg,土壤碱解氮、速效磷和速效钾平均含量的变化范围分别为210.96~320.88、1.47~3.91、94.61~226.76 mg/kg,其大小关系均表现为土面〉土槽〉土窝〉土被。相关分析显示,在研究区域内,地形因子与微地貌土壤养分之间没有明显的相关性,喀斯特坡耕地土壤养分含量空间分布与微地貌类型关系密切。To explore relationship between different karst slope farmland microtopography and soil nutrients,soil nutrients of different karst slope farmland microtopography were surveyed using grid sampling method.Results showed that different karst slope farmland microtopography had different soil nutrients, the averagerange of total organic matter content in soil was 61.14-191.34 g/kg, the average range of total nitrogen contentin soil was 1.50- 3.58 g/kg, the average range of total phosphorus content in soil was 0.67- 1.31 g/kg, theaverage range of total potassium content in soil was 13.7- 36.4 g/kg. The average ranges of soil nitrogen,phosphorus and potassium content were 210.96- 320.88, 1.47- 3.91 and 94.61- 226.76 mg/kg, respectively,exhibiting the following rules： soil surface〉 soil bin〉 soil nest〉 soil mulch. Correlation analysis showed thatthere was no significant correlation between microtopography soil nutrients and topographic factors, but karstslope farmland soil nutrients were closely related to microtopography types.

关 键 词：喀斯特 坡耕地 微地貌 土壤养分 

分 类 号：S158.2[农业科学—土壤学]