三倍体毛白杨速生林土壤养分因子及pH值动态变化  

Dynamics of soil nutritional factors and pH value of triploid Populus tomentosa plantation

作　　者：赵雪梅[1] 孙向阳[1] 王海燕[1] 田赟[1] 康向阳[2] 

机构地区：[1]北京林业大学水土保持学院,北京100083 [2]北京林业大学生命科学与技术学院,北京100083

出　　处：《生态学报》2010年第13期3414-3423,共10页Acta Ecologica Sinica

基　　金：国家"十一五"科技支撑资助项目(2006BAD32B01);国家林业局专项课题资助项目(2002-66)

摘　　要：通过连续4a测定2年生三倍体毛白杨(B304)及其对照二倍体(1319)林地内0-20cm、20-40cm和40-60cm土层中土壤理化指标(包括pH值、有机质、全N、碱解N、全P、有效P、全K和速效K含量),以明确三倍体毛白杨种植对土壤养分及其理化性质的影响。试验结果表明,(1)在4a生长期内林地土壤的pH值呈现碱性增强变化;B304的平均pH值由8.13升至8.43,1319由8.12升至8.78,虽然二者没有显著差异,但三倍体对林地的pH值影响相对较小,更利于土壤酸碱平衡及土壤缓冲力的稳定性;(2)土壤中有机质及碱解N含量呈现先降低后升高的变化特点,品种间差异不显著;(3)在2006年,毛白杨林地土壤中有效P和速效K含量显著下降,降幅均为0-20cm>20-40cm>40-60cm;(4)年份、土层及年份和土层的交互作用对毛白杨土壤pH值及所测定的全部养分因子影响均达显著水平(P<0.05);而品种、年份、土层三者的交互效应对土壤pH值、有机质、全N、全P和速效K的含量影响也达到了显著性水平。体现了三倍体毛白杨速生林种植对当地不同土层理化性质和养分因子影响的时间效应,生产中应采取积极措施改善或减缓土壤环境恶化,促进林木更好生长。A split-plot field experiment with 2 years old triploid Populus tomentosa clone（B304）as experimental material and diploid clone（1319）as control was conducted in Wei County,Hebei Province.The dynamics of some soil physical-chemical properties in triploid Populus tomentosa plantations during the first four years of cultivation were examined.The results showed that：（1）Both clones＇ soil pH increased after planting and the pH value of triploid Populus tomentosa（the mean was 8.43 in 2008）was lower than the control one（the mean was 8.78 in 2008）,which was more conductive to soil acid-base balance ability and buffer power.（2）Soil organic matter and available N content first decreased,but then increased in the three soil layers and no significant difference was found between the two clones.（3）After two years of planting,high demand on soil nutrients was found in triploid Populus tomentosa,especially on available P and readily available K whose content decreased significantly in the order of 0-20cm 20-40cm 40-60cm.（4）Significant differences caused by year,soil layer and their interaction effect were found for all nutrients＇ content and pH value and the same result was also observed for the interaction effect among year,layer and clone.

关 键 词：毛白杨 三倍体 PH值 土壤养分 动态变化 

分 类 号：S714[农业科学—林学]