摘要
了解不同海拔华北落叶松人工林土壤养分特征规律,为揭示土壤-海拔生态学功能具有重要作用。本文以山西吕梁关帝山自然保护区八道沟和柴禄沟落叶松人工林为研究对象,采用随机取样法取样,测定土壤总氮、有效钾、土壤有机质、有效磷、土壤总磷和铵态氮含量,分析土壤养分水平和垂直空间变异性。结果表明:(1)关帝山八道沟、柴禄沟土壤有机质含量分别为77.38 g/kg、55.38 g/kg,两区域有机质含量充沛,其余土壤各养分含量也相对较高。(2)通过半方差函数分析两区域土壤养分,得出除柴禄沟土壤有机质含量拟合程度不高外,两区域的土壤其余养分拟合模型理想,八道沟土壤总氮和有机质含量空间变异小于柴禄沟。(3)分析两区域典型林分的土壤养分空间分布图可知,两区域土壤各养分含量表现为在东北方向上占绝对优势。八道沟土壤各养分空间分布较为复杂。(4)根据土壤各类养分含量Pearson相关性分析发现,土壤养分两两之间存在相关性,具有协同效应。土壤有机质与有效钾呈极显著负相关,土壤有效磷与土壤铵态氮呈极显著负相关性。(5)对土壤养分含量随海拔梯度变化分析可知,土壤养分含量大体上均随海拔梯度的增加而增加,土壤铵态氮含量与土壤总氮和有机质含量随海拔梯度变化趋势相同。
Understanding of the soil nutrient characteristics of Larix principis-rupprechtii plantation at different altitudes plays an important role in revealing the soil-altitude ecological function.Taking Badaogou and Chailugou sample plots of Larix gmelinii plantation in Guandi Mountains as research objects,the contents of total nitrogen,available potassium,soil organic matter,available phosphorus,total phosphorus and ammonium nitrogen were determined by a random sampling method,the horizontal and vertical spatial variability of soil nutrients were analyzed.The results showed that:(1)The soil organic matter contents of Badaogou sample plot and Chailugou sample plot in Guandi Mountain were 77.38 g/kg and 55.38 g/kg respectively.The organic matter contents of the two sample plots were abundant,and the other soil nutrient contents were relatively high.(2)The semi-variance function was used to analyze the soil nutrients of the two plots.The results showed that except for the low fitting degree of soil organic matter content in the Chailugou plot,the fitting model of the remaining soil nutrients in the two plots was ideal,the spatial variation of soil total nitrogen and organic matter content in the Badaogou plot was smaller than that in the Chailugou plot.(3)By analyzing the spatial distribution maps of soil nutrients in the two plots of typical forests,it was found that the soil nutrient content in the two plots was absolutely dominant in the Northeast direction.The spatial distribution of soil nutrients in Badaogou sample plot was complex.(4)According to Pearson correlation analysis of the soil nutrient content,it was found that there was a correlation between soil nutrient content and soil nutrient content,and there was a synergistic effect.Soil organic matter was negatively correlated with available potassium,and soil available phosphorus was negatively correlated with soil ammonium nitrogen.(5)Through analyzing the changes in the soil nutrient contents with the elevation gradients,it could be concluded that the soil nutrient content increased with the elevation gradient on the whole,and the change trend of soil ammonium nitrogen content was the same as that of soil total nitrogen and organic matter content with the elevation gradient.
作者
赵伟文
梁文俊
魏曦
ZHAO Wei-wen;LIANG Wen-jun;WEI Xi(College of Forestry,Shanxi Agricultural University,Taigu,Shanxi 030801,China)
出处
《江西农业大学学报》
CAS
CSCD
北大核心
2019年第6期1103-1112,共10页
Acta Agriculturae Universitatis Jiangxiensis
基金
国家自然科学基金项目（31971644,31901365,31500523）
山西农业大学引进人才科研启动项目（2014YJ19）
山西省优秀博士来晋工作奖励资金科研项目（SXYBKY2018032）~~
关键词
华北落叶松
海拔
土壤养分
空间变异
Larix principis-rupprechtii
altitudes
soil nutrient
spatial variation
