石羊河尾闾(青土湖)水面形成后土壤养分的空间特征

通过测定青土湖不同土层、不同水面距离的土壤有机质、全氮、全磷、全钾、速效氮、速效磷和电解质，对比不同土层和水面距离的土壤养分差异，分析其空间变异性以及相关关系。结果表明：１）青土湖的土壤各养分含量均较低，水面形成的干扰改变了原状土壤的理化性质，水面的形成对土壤养分垂直分布的影响范围在0~40cm。；2）0-60cm土层深度的有机质、全氮、速效氮、全磷、全钾和土壤溶液电导率分别在距水面100-150m和300 m处达到最大值，在距水面200 m处为最小，呈波浪式变化，这种波浪式变化与其原湖泊沉积和区域气候环境相符合。；32）土壤养分含量存在显著空间变异性，各养分指标含量随土层深度变化规律明显，不同水面距离0～40cm土层土壤有机质、全氮等含量均比40~80cm高，土壤各养分含量除了土壤全钾含量在0~80cm、土壤全磷在60~80cm为弱变异外，其他均属于中等变异。；43）在0~40cm土层深度，有机质与全氮、全钾，速效氮、电导率呈正相关；电导率和速效磷、全磷呈正相关。青土湖的土壤各养分含量均较低，水面形成的干扰改变了原土壤的理化性质，水面的形成对土壤养分垂直分布的影响范围在0~40cm。

The Spatial Characteristics of Soil Nutrients After the Formation of Water in the Tail-streams of Shiyang River (Qintu Lake)

Though measuring soil nutrients of different soil and different surface distances in Qingtu Lake, which were organic matter, total nitrogen, total phosphorus, total potassium, alkaline hydrolysis N, available P and electrolytes, contrasting differences and water away from soil nutrients, and analyzing their spatial variability and correlation, the results showed that: 1) soil nutrient content of Qingtu Lake were low; 21) 0-60cm depth of soil organic matter, total nitrogen, available nitrogen, total phosphorus, total potassium and soil electrical conductivity of the soil solution from the surface, 100-150m and 300 m reached a maximum respectively, 200 m away from the surface of the water was a minimum, wavy change.;This waving changes were consistent with its original lake sediment and regional climate environment ; 32) there was a significant variability of soil nutrient content, each nutrient content of spatial with soil depth varied significantly, different surface distance 0 ~ 40cm of soil organic matter, total nitrogen and other content were high than the 40 ~ 80cm, each nutrient content of the soil except for soil total potassium content in 0 ~ 80cm and total soil phosphorus in 60 ~ 80cm were weak variation, others belonged to moderate variability ; 43) at 0 ~ 40cm soil depth, organic matter and total nitrogen, total potassium, available nitrogen, the conductivity was positively correlated; conductivity and available phosphorus, total phosphorus were positively correlated. The soil nutrient content of Qingtu Lake were low; Interference of the formation of the water changed the physical and chemical properties of the soil, and the scope of the vertical distribution of soil nutrients which was effected by the formation of the water was 0 ~ 40cm.