摘要
以毛乌素沙地东南缘沙漠-黄土交错带樟子松林为研究对象,通过采集神木市、榆阳区和横山区樟子松林下7个土层深度(0～200 cm)的土壤,分别对其养分及颗粒组成进行分析.结果表明:毛乌素沙地东南缘樟子松林土壤养分整体水平低,土壤有机质、有机碳、全氮、有效氮、速效磷、速效钾和盐分的平均含量分别为3.03、1.76 g/kg及59.98、19.28、0.97、36.15、0.25 mg/kg,土壤pH呈碱性.由于影响土壤养分分布的因素及其变化的复杂性,土壤养分含量在区域上和剖面上均存在不同程度的差异.土壤养分含量与土壤粒度之间均存在着较好的相关性,大多数养分因子含量与细沙物质呈显著正相关关系,与粗沙物质呈显著负相关关系.总体上,毛乌素沙地东南缘樟子松林土壤肥力质量自东北向西南逐渐增加且土壤养分具有明显的表聚性.
Taking the Pinus sylvestris var.mongolica in the desert-loess interlaced zone of southeastern Mu Us Sandy Land as the study subject,we analyzed the characteristics of soil nutrients and soil grain size composition by collecting soil samples of seven depths(0-200 cm),under the Pinus sylvestris var.mongolica in Shenmu,Yuyang and Hengshan,respectively.Results showed that soil nutrient content was low during the whole study areas.The mean content of soil organic matter,total organic carbon,total nitrogen,available nitrogen,available phosphorus,available potassium and salt weres 3.03,1.76 g/kg and 59.98,19.28,0.97,36.15,0.25 mg/kg,respectively.The soil was alkaline.Due to the complexity of the factors with affecting soil nutrients distribution and their changes,there was certain difference in the content of soil nutrients in space and depth.There was a good correlation between soil nutrient content and the grain size.Concretely,the positive correlation between most of the soil nutrient factors and the content of fine sand was strong,whereas the correlation between the soil nutrients and the content of coarse sand was negative.Overall,the quality of soil fertility of the Pinus sylvestris var.mongolica had gradually increased from northeast to southwest,and the surface soil fertility had an obvious aggregation in the southeastern Mu Us Sandy Land.
作者
杨军怀
拓飞
齐海波
南维鸽
董治宝
YANG Junhuai;TA Fei;QI Haibo;NAN Weige;DONG Zhibao(School of Geography and Tourism,Shaanxi Normal University,Xi'an 710119,China;Green Office of Yulin Municipality,Yulin 719000,Shaanxi China)
出处
《河南科学》
2019年第1期78-85,共8页
Henan Science
基金
中国博士后基金项目(2017M613049)
中央高校基本科研业务费专项资金项目(GK201703050)
陕西省博士后基金项目(2017BSHEDZZ15)
德国政府贷款陕西榆林长城沿线沙地治理及生物多样性保护项目(H152041008)
关键词
养分
粒度
空间异质性
樟子松林
毛乌素沙地
soil nutrient
grain size
spatial heterogeneity
Pinus sylvestris var.mongolica
Mu Us Sandy Land
