新疆甘家湖梭梭林林地土壤养分、盐分的累积特征

Characteristics of Soil Nutrient,Salt Accumulation of Ganjiahu Haloxylon National Nature Reserve in Xinjiang

以新疆甘家湖梭梭林自然保护区植被盖度C≥70%（HC）、50%≤C〈70%（MC）、30%≤C〈50%（LC）和无林地（NL）4种林地类型土壤为研究对象,分析测定了土壤养分和盐分在0~100 cm空间上的分布特征。结果显示：4种盖度林地土壤有机质质量分数均不高,仅有2.70~6.90 g·kg-1。土壤中全效氮、磷和速效氮、磷、钾质量分数与有机质质量分数呈极显著正相关（P〈0.001）,且全氮、全磷质量分数与有机质质量分数的比值相近（0.033 0、0.033 2）。HC、MC、LC和NL林地土壤的速效磷和速效钾表聚现象明显,

With vegetation coverage C ≥ 70% （ HC）, 50% ≤ C〈70% （ MC）, 30% ≤ C〈50% （ LC ） and non-wood land （NL） in four types of woodland in Xinjiang Ganjiahu Haloxylon Nature Reserve, we measured and analyzed the spatial distribu- tion characteristics of soil nutrients and soil salinity from 0 to 100 cm. The organic matter contents of four woodlands were all not high, with 2.70-6.90 g kg-1. The correlation between the contents of total nitrogen, phosphorus and available nitrogen, phosphorus, potassium with organic matter in soil was positive significant （ P〈0.001 ）, and the ratios of total phosphorus and nitrogen with organic matter were similar （0.033 0, 0.033 2）. Available phosphorus and available potassium were obvious in the soil surface, and the soil available phosphorus content in 0〈H≤20 cm soil layer of HC, MC, LC and NL accounted for 28.2%, 40.5%, 40.5% and 28.2% respectively, and available potassium content accounted for 41.8%, 30.1%, 34.2% and 40.6%, respectively, pH value of soil profile in four Haloxylon woodlands was greater than 8, and total salt content in 0〈H≤10 cm and 60 cm〈H≤ 100 cm soil layers were higher than that in 20 cm〈H≤60 cm middle layer. Cl- and SO2- were the main anions, and Na＋ and Ca2＋ were the main cations in the soil. Therefore, the soil quality of woodland with higher organic matter and available nutrient content of woodland, but with lower soil salinity, was better than that of non-wood land.