宁夏典型草原土壤理化性状对不同管理方式的响应  

Response to Different Management Modes of Soil Physical and Chemical Prosperities in Typical Steppe,Ningxia

作　　者：沈艳[1,2] 马红彬[1,2] 谢应忠[1,2] 许冬梅[1,2] 赵菲[1] 

机构地区：[1]宁夏大学草业科学研究所,银川750021 [2]西北土地退化与生态恢复国家重点实验室培育基地,银川750021

出　　处：《水土保持学报》2012年第5期84-89,共6页Journal of Soil and Water Conservation

基　　金：国家自然科学基金项目(31001032);高等学校博士学科点专项科研项目(20096401120002);宁夏大学自然科学基金项目(NDZR10-80)

摘　　要：以宁夏典型草原为对象,研究封育、放牧和水平沟改良管理方式下草原土壤颗粒组成、土壤容重、有机质含量、全氮、水解氮、速效磷和速效钾的分布差异。结果表明,不同管理方式下0-40cm土壤以细沙粒和粗粉粒为主,占颗粒总量的58.46%～77.48%,管理方式对土壤质地无明显影响,但0-15cm土层粘粒和粉粒含量随封育年限的增加呈上升趋势;放牧能显著增加0-5cm土壤容重;管理方式对0-40cm土层有机质、全氮、水解氮、速效磷和速效钾含量影响显著,以封育15,20,25年和水平沟改良10年的草地土壤养分含量较高,放牧草地最低;各管理方式下土壤养分含量表现为随土层深度增加而下降;典型草原土壤理化性状间存在显著相关性。The typical steppe was as the studied object.The spatial differentiation of soil particle composition,soil bulk,organic content,total nitrogen,hydrolysable nitrogen,rapid available phosphorus and available potassium under different management modes including enclosure,grazing and horizontalditch were studied.The results showed that thin sand grains and silt were main particles about 58.46%~77.48% of 0-40 cm soil layer under different management modes.The effects on soil bulk by management modes were significant,but not significant on soil texture.The clay content was increasing in 0-15 cm soil layer with enclosure time.The soil organic content,total nitrogen,hydrolysable nitrogen,rapid available phosphorus and available potassium were significantly affected by management modes,the soil nutrients in grasslands of enclosure for 15,20,25 years and in horizontalditch for 10 years were higher than in other management modes,and the grazing grassland was the lowest.All soil nutrients decreased with the soil depth increasing.There were positive relationships among soil physical and chemical properties.

关 键 词：典型草原 土壤颗粒组成 土壤养分 管理方式 

分 类 号：S158.3[农业科学—土壤学]