胡杨、梭梭群落土壤理化性质及其相互关系

Soil Physical-chemical Properties of Populus euphratica and Haloxylon persicum Communities and Their Relationship

结合野外调查取样与实验室测定等手段，比较研究了新疆艾比湖湿地自然保护区裸地、梭梭与胡杨样地0～10cm、10～30cm、30～50cm土层土壤氮素含量特征及土壤理化性质。结果表明：裸地、梭梭和胡杨样地内的土壤有机质、硝态氮、铵态氮、亚硝态氮与碱解氮均随着土层深度的增加而递减，具有表聚性特点。土壤中3种无机氮的含量为：硝态氮〉亚硝态氮〉铵态氮，硝态氮最高达到7．512mg·kg^-1，铵态氮最高仅为0．815mg·kg^-1，故硝态氮是土壤无机氮的主要赋存形式。同一土层胡杨氮素总含量高于裸地和梭梭，其有机质含量最高（均值为11．852g·kg^-1）。相关分析表明，除铵态氮外，有机质与全磷和其他氮素间呈显著相关。pH与其他土壤理化性质及氮素含量问均呈不显著相关，碱解氮与土壤理化性质（除pH与电导率外）及其他氮素间均呈极显著相关（P〈0．01）。

By field survey, sampling and laboratory measuring, soil physical-chemical properties at 0 - 10 cm, 10 -30 cm, 30 -50 cm soil depths from the bare, Populus euphratica and Haloxylon persicum in the Ebinur Lake Basin were researched. The results showed that the soil organic matter, NO3^- -N, NH4^＋ -N, NO2^- -N and a- vailable nitrogen were gradually decreased with the soil depth increases, with the properties of surface-aggregation. Proportion of three kinds of inorganic nitrogen in soils, from high to low, is NO3 - - N 〉 NO2 - - N 〉 NH4^＋ - N, the former up to 7. 512 mg · kg^-1 and the third 0.815 mg · kg^-1. NO3^- - N is a major form of soil inorganic nitro- gen. Total nitrogen content in Populus euphratica forestland was higher than those in bare land and Haloxylon persi- cum forestland in the same layers, and its soil organic content was also the highest （ average of 11. 852 g ~ kg - l ）. Correlation analysis showed that except for NH4 ＋ - N, organic matter, total phosphorus and other nitrogen were sig- nificantly correlative, howere, pH and other soil physical-chemical properties were not signifi There was a very significant correlation between available nitrogen, other soil physical-chemical for pH and electronic conductivity） and other nitrogen（P 〈0. O1 ）. cantly correlative. properties （ except