【摘要】 为了探明不同密度马尾松人工林的土壤肥力,在桂西北乐里林场的同一坡面上,选择6年生不同密度(处理1为1 050株/hm2、处理2为1 125株/hm2、处理3为1 200株/hm2、处理4为1500株/hm2)样地,研究其土壤(0~40cm土层)的肥力状况。结果表明:1)各密度土壤pH为4.91~5.35,但差异不明显。2)各密度土壤有机质含量为10.28~34.70g/kg,平均值依次为处理1>处理2>处理4>处理3。3)各密度土壤N/P/K全量依次为0.67~1.60g/kg、0.49~0.99g/kg和11.02~21.56g/kg,平均值依次为处理1>处理2>处理3>处理4。4)各密度土壤速效N/P/K含量依次为79.4~143.0mg/kg、0.6~2.0mg/kg和194.5~959.2mg/kg,平均值依次处理1>处理2>处理3>处理4。5)各密度土壤有效Ca/Mg/Cu/Zn/B的含量依次为397.8~959.2mg/kg、90.1~164.9mg/kg、0.45~1.25mg/kg、0.54~2.25mg/kg和0.11~0.21mg/kg,除Ca含量为处理1>处理2>处理3>处理4外,有效Mg/Cu/Zn/B含量与密度的关系不明显,差异微小。更多还原

【Abstract】 The soil fertility(0~40cm soil layers)of P.massonianaplantations with six-year old at the same slope surface of Leli forest farm under four different stand densities(treatment 1with 1050trees/hm2,treatment 2 with 1 125trees/hm2,treatment 3 with 1 200trees/hm2 and treatment 4 with 1500trees/hm2) was determined to explore the effects of different stand densities on soil fertility of P.massonianaplantations.The results showed that:1)There is no obvious difference in pH among four stand densities;2)The range of soil organic matter content of different treatments is 10.28~34.70g/kg,and the average value is treatment 1> treatment 2 > treatment 4 > treatment 3;3)Total N,P and K content of four different treatments is 0.67~1.60g/kg,0.49~0.99g/kg and 11.02~21.56g/kg respectively,and the average value is treatment 1 > treatment 2 > treatment 3 > treatment 4;4)The available N,P and K content of four different treatments is 79.4~143.0 mg/kg,0.6~2.0 mg/kg and194.5~959.2 mg/kg separately,and the average value is treatment 1 > treatment 2 > treatment 3 >treatment 4;5) The available Ca, Mg,Cu,Zn and B content of four different treatments is397.8~959.2mg/kg,90.1~164.9mg/kg,0.45~1.25mg/kg,0.54~2.25mg/kg and 0.11~0.21mg/kg respectively,and the Ca content is treatment 1 >treatment 2 >treatment 3 >treatment 4but there are no obvious differences in Mg,Cu,Zn and B content among four different treatments.更多还原