摘要
为了探讨三峡库区万州区新田国有林场马尾松近熟林低效林改造的效果,试验设置了常规抚育间伐、近自然经营、林下清理和原始状态(对照)4种处理,研究各种低效林改造措施对马尾松林地土壤养分的影响。结果表明,各处理随着土层的加深,土壤pH值和全钾逐渐上升,但变化很小,而且各处理之间无显著差异;土壤的有机质、全氮、碱解氮、有效磷、速效钾含量呈显著减小的趋势,0～20cm,土壤有机质、碱解氮、全氮、有效磷、速效钾含量显著高于其他土层;全磷各土层之间无显著差异。在低效林改造措施中,常规抚育间伐有利于枯枝落叶中磷素的分解与转移,近自然经营促进了钾素的释放,林下清理提高了有机质、氮素的转化与分解。三峡库区万州区马尾松林地土壤有效氮磷钾的分布主要在表层土壤。
Four management patterns of conventional intermediate cutting,nearly natural management,cleaning under forest and CK were tested to study the effect on soil nutrients of low efficient P.massoniana forest in Wanzhou District of the Three Gorges Reservoir Area.The results showed that the pH and total K content of different treatments gradually rose with depth increase of soil layer,but the change wasa little.There was no obvious difference in pH and total K between different treatments.The organic matter,total N,alkaline hydrolyze N,available P,and rapidly available K content in soil samples of different treatments significantly reduced with depth increase of soil layer.The organic matter,alkaline hydrolyze N,total N,available P and rapidly available K content in soil layer with 0~20 cm was significantly higher than other soil layers,but there was no significant difference in total P content between different soil layers.The conventional intermediate cutting pattern was beneficial to P decomposition and transfer from dry branches and fallen leaves.The nearly natural management pattern could promote K release.The cleaning under forest pattern could improve transformation and decomposition of organic matter and nitrogen.Therefore,strengthening management of pH,N,P and K is the important measure to effectively manage P.massoniana forest in Wanzhou District of the Three Gorges Reservoir Area during P.massoniana growth because of the available N,P and K content is mainly distributed in the surface soil.
出处
《贵州农业科学》
CAS
北大核心
2012年第4期121-126,共6页
Guizhou Agricultural Sciences
基金
国家公益性行业科研专项"三峡库区流域生态修复关键技术研究与示范"(201004039)
重庆市科技攻关项目"提升林地生产力复合经营技术研究"(CSTC
2009AB1115)
重庆三峡库区森林生态保护与恢复市级重点实验室(CSTC
2007CA1001)
关键词
马尾松
低效林改造
三峡库区
土壤养分
Pinus massoniana
reconstruction of low efficient forest
the Three Gorges Reservoir Area
soil nutrient
