摘要
通过对秦岭山区陕西周至县厚畛子镇安沟流域立地条件基本相同的锐齿栎、楸树、油松和日本落叶松4种典型林地土壤微生物数量的定位试验监测,结果表明,当地森林的土壤微生物从数量上主要以细菌为主,约为微生物总量的87.86%～97.65%,其次为放线菌,真菌最少。微生物数量的季节动态明显,夏季高出冬季74.43%～354.05%。纯林与混交林土壤微生物数量关系为：阔叶林纯林〉针叶林与阔叶林1∶3比例混交〉针叶林与阔叶林1∶1比例混交〉针叶林纯林。外源性C、N混合干扰使微生物数量比对照区增加了35.30%～945.88%。枯落叶客置使针叶林纯林的微生物数量增加了25.59%～73.87%,阔叶林减少了29.95%～68.12%。因此采用外源性C、N干扰,客土混合及枯落叶客置的定位模拟试验,进一步探讨不同树种的种间关系,为指导当地人工纯林的管理和更新改造提供理论科学依据和实践指导。
Soil microbes quantities of the four typical plantations were examed： Qvercus aliena var. acuteserrata ,Catalpa f argesii , Pinus tabulae f orrnis and Larix kaemp f eri on the Angou valley Qinling Mountains Shaanxi Province. The results indicated： that the dominant microbe in the soils examined was bacteria ranging from 87. 86% to 97. 65% , followed by actinomyces, and fungus. The seasonal dynamics of the number of microbes in soil was significant. In addition, the number of soil microbes in summer was increased from 74. 43% to 354.05%, compared to that in winter. Soil microbes quantities in the soil of dif ferent forests were in an order of pure broad-leaved forests〉mixed needle-leaved with broad forests proportion of 1 ： 3〉mixed needle-leaved with broad forests proportion of 1： 1〉pure needle-leaved forests. Compared to the control, application of C combined with N increased the number of soil microbes from 35. 30% to 945.88%. Laying litter increased the number of soil microbes in pine forests from 25.59% to 73. 83%, however, which decreased the number of soil microbes from 29. 95% to 68. 12% in broad-leaved forest. Therefore, in this article, we used extral C and N, mixed soil, exchanged litter to analyze the interspecies relationship between different species to provide theoretical direction for local pure plantation management and forest renewal.
出处
《西北林学院学报》
CSCD
北大核心
2008年第2期129-134,共6页
Journal of Northwest Forestry University
基金
国家自然科学基金(30471367)
西北农林科技大学青年学术骨干计划项目(2005)
关键词
土壤微生物
人为干扰
混交林
种间关系
soil microorganism
anthropogenic disturbance
mixed forest
interspecies relationship
