新疆野生樱桃李林自然保护区不同海拔梯度土壤养分特征及相关性分析

为探明新疆野生樱桃李林自然保护区土壤养分在不同海拔的变化特征，以新疆霍城县大西沟野生樱桃李林自然保护区的土壤为研究对象，测定了6个不同海拔梯度0～100 cm土层剖面土壤养分含量，并对土壤养分含量的变化规律及相关性进行分析。结果表明：野生樱桃李林土壤养分含量呈现明显的垂直分布特征，不同海拔梯度土壤有机质（OM）、全氮（TN）、速效氮（AN）、全磷（TP）、速效磷（AP）、全钾（TK）和速效钾（AK）含量随土层深度的增加均呈现出逐渐降低的趋势。野生樱桃李林土壤养分含量分布变化范围为土壤OM含量2.73～128.95 g/kg，土壤TN、TP、TK含量分别为0.55～5.28 g/kg、0.46～3.66 g/kg、1.399～8.786 g/kg，土壤AN、AP、AK含量分别为17.45～146.69 mg/kg、6.31～81.13 mg/kg、6.43～69.94 mg/kg，不同土壤养分含量在土壤表层的占比均较高，说明土壤养分含量主要集中分布在土壤表层。野生樱桃李林各土壤养分之间有明显的相关性，OM与TN、TP和TK呈极显著正相关（P<0.01）；AN与AP、AK、OM、TN和TK呈显著正相关（P<0.05）；AP与AK、OM、TN、TP和TK呈显著正相关（P<0.05）；AK与OM、TN、TP和TK呈极显著正相关（P<0.01）。

Nutrient Characteristics and Correlation Analysis of Soil Under Prunus divaricata in Xinjiang

In order to verify the changing characteristics of soil nutrients at different altitudinal gradients in Xinjiang Prunus divaricata natural reserve, this paper took the soil in Daxigou valley at Huocheng county as research object, and determined soil nutrient contents at 0~100 cm soil profile from 6 different altitudes, and analyzed the changing law of soil nutrient contents and their correlations. The results showed that the soil nutrient contents presented obvious vertical distribution characteristics in Prunus divaricata and the contents of soil OM, TN, AN, TP, AP, TK and AK at different altitudes decreased gradually with the increase of soil depth. Variation range of soil nutrient in Prunus divaricata were as the following: soil OM content was 2.73～128.95 g/kg; soil TN, TP, and TK contents were 0.55～5.28 g/kg, 0.46~3.66 g/kg, 1.399~8.786 g/kg, respectively; soil AN, AP, AK contents were 17.45～146.69 g/kg, 6.31～81.13 g/kg, 6.43～69.94 mg/kg, respectively. The contents of different soil nutrients in soil surface were higher, indicating that the soil nutrients were mainly distributed in soil surface. There were obvious correlation between each soil nutrient, and OM was significantly and positively correlated with TN, TP and TK（P<0.01）. AN was also significantly and positively correlated with AP, AK, OM, TN and TK（P<0.05）. AP was significantly and positively correlated with AK, OM, TN, TP and TK（P<0.05）. AK was significantly and positively correlated with OM, TN, TP and TK（P<0.01）.