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Changes in Chemical and Microbial Soil Parameters Following 8 Years of Deadwood Decay: An Experiment with Logs of 13 Tree Species in 30 Forests
Ecosystems ( IF 3.4 ) Pub Date : 2020-09-21 , DOI: 10.1007/s10021-020-00562-z
Cynthia Minnich , Derek Peršoh , Christian Poll , Werner Borken

Deadwood may alter the chemical and microbial properties of forest soils. However, it is unclear how downed deadwood (logs) of different tree species affect nutrients, microbial activity and biomass in different forest soils and regions. We investigated the effect of logs on underlying soils after 8 years of decomposition in an experiment consisting of 13 log tree species replicated at 30 forest sites across three German regions with distinct climate and geology. Soils beneath logs were compared to soils without recognizable influence of deadwood (control) 8 m away. Carbon, nitrogen, phosphorous and calcium concentrations increased by 5–18% in the soils under logs, whereas soil potassium, magnesium, iron, manganese and aluminum were not or slightly negatively affected by logs. Soils beneath logs exhibited 33%, 18% and 54% higher carbon mineralization, microbial biomass and ergosterol (component of fungal cell membranes) contents, respectively. Despite major differences in decay rates, the effect on soil properties hardly differed among the 13 log tree species. The effect of logs on microbial and chemical soil parameters increased with decreasing concentration of carbon, nitrogen, phosphorous and pH in the prevailing forest soils. Consequently, the strongest effects of logs on soil parameters occurred in plots with low soil nutrient contents and low soil pH. Our results suggest that logs of all tree species primarily increase the microbial activity and nutrient contents of acidic and nutrient-poor soils.



中文翻译:

枯木腐烂8年后化学和微生物土壤参数的变化:以30种森林中13种树种的原木为实验

沉材可能会改变森林土壤的化学和微生物特性。然而,目前尚不清楚不同树种的沉木(原木)如何影响不同森林土壤和地区的养分,微生物活性和生物量。我们在一个实验中调查了原木对8年分解后底层土壤的影响,该实验由在德国三个不同地区的30个森林地点复制的13种原木树种组成,具有不同的气候和地质条件。将原木下面的土壤与没有可辨认的8 km外的硬木(对照)影响的土壤进行比较。原木下的土壤中碳,氮,磷和钙的浓度增加了5-18%,而土壤钾,镁,铁,锰和铝不受原木的影响或受到轻微的负面影响。原木下面的土壤占33%,碳矿化,微生物生物量和麦角固醇(真菌细胞膜的成分)含量分别增加18%和54%。尽管腐烂率存在重大差异,但在13种原木中,其对土壤特性的影响几乎没有差异。随着主要森林土壤中碳,氮,磷和pH值的降低,原木对微生物和化学土壤参数的影响增加。因此,原木对土壤参数的最强影响发生在土壤养分含量低和土壤pH值低的地块。我们的结果表明,所有树木的原木主要增加酸性和营养贫瘠土壤的微生物活性和营养成分。13种原木对土壤特性的影响几乎没有差异。随着主要森林土壤中碳,氮,磷和pH值的降低,原木对微生物和化学土壤参数的影响增加。因此,原木对土壤参数的最强影响发生在土壤养分含量低和土壤pH值低的地块。我们的结果表明,所有树木的原木主要增加酸性和营养贫瘠土壤的微生物活性和营养成分。13种原木对土壤特性的影响几乎没有差异。随着主要森林土壤中碳,氮,磷和pH值的降低,原木对微生物和化学土壤参数的影响增加。因此,原木对土壤参数的最强影响发生在土壤养分含量低和土壤pH值低的地块。我们的结果表明,所有树木的原木主要增加酸性和营养贫瘠土壤的微生物活性和营养成分。在土壤养分含量低,土壤pH值低的地块上,测井对土壤参数的影响最大。我们的结果表明,所有树木的原木主要增加酸性和营养贫瘠土壤的微生物活性和营养成分。原木对土壤参数的影响最大,发生在土壤养分含量低,土壤pH低的地块。我们的结果表明,所有树木的原木主要增加酸性和营养贫瘠土壤的微生物活性和营养成分。

更新日期:2020-09-22
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