黔东南不同植被类型下土壤养分及颗粒态有机碳差异分析

Fertility characteristics and particulate organic carbon of different types of vegetation in Qiandongnan

以贵州黔东南不同植被类型下森林土壤为研究对象,通过野外调查与室内分析相结合的方法,对黔东南不同植被类型林下土壤混合样（0～20 cm）养分含量和土壤酸度进行研究.结果表明：4种典型植被土壤均呈较强的酸性,pH值在4.46～5.38之间.4种植被类型林下土壤有机质大小关系为阔叶混交林（52.16 g/kg）＞杉木林（50.16g/kg）＞针阔混交林（40.07 g/kg）＞马尾松林（30.61g/kg）;全氮含量最低的是马尾松林（1.13g/kg）,最高的是阔叶混交林（2.31g/kg）.全磷与全氮大小关系均表现为：阔叶混交林＞针阔混交林＞杉木林＞马尾松林;土壤全钾含量依次为阔叶混交林（14.33g/kg）＞杉木林（12.30g/kg）＞马尾松林（11.35g/kg）＞针阔混交林（10.5g/kg）;不同植被类型林下土壤颗粒态有机碳大小为：马尾松林＞针阔混交林＞阔叶混交林＞杉木林.

Forest soil under different types of vegetation in Qiandongnan area was investigated in the study. Nutrient content and soil acidity of mixed forest soil samples from various types of vegetation （0-20 cm） were studied by methods of field investigation and indoor analysis. The results showed that, soil samples of four kinds of typical vegetation had strong acidity, pH value of them was 4.46-5.38. Soil organic matters of four types of vegetation showed broadleaf mixed forest （52.16 g/kg）〉 Chinese fir forest （50.16 g/kg） 〉 mixed needle forest （40.07 g/kg） 〉 Chinese red pine （30.61 g/kg）; The horsetail pine had the lowest total nitrogen content （1.13 g/kg）, and the broadleaf mixed forest had the highest total nitrogen content （2.31 g/kg）; Total phosphorus and total nitrogen were shown as broadleaf mixed forest 〉 mixed needle forest 〉 Chinese fir forest 〉 Chinese red pine; Total potassium in four types of vegetation was shown as broadleaf mixed forest （14.33 g/kg） 〉 Chinese fir forest （12.30 g/kg）〉 Chinese red pine （11.35 g/kg） 〉 mixed needle forest （10.5 g/kg）; Particulate organic carbon in four types of vegetation was shown as Chinese red pine 〉 mixed needle forest 〉 broadleaf mixed forest〉 Chinese fir forest.