MICROBIAL COMMUNITY STRUCTURE AND PH RESPONSE IN RELATION TO SOIL ORGANIC-MATTER QUALITY IN WOOD-ASH FERTILIZED, CLEAR-CUT OR BURNED CONIFEROUS FOREST SOILS
MICROBIAL COMMUNITY STRUCTURE AND PH RESPONSE IN RELATION TO SOIL ORGANIC-MATTER QUALITY IN WOOD-ASH FERTILIZED, CLEAR-CUT OR BURNED CONIFEROUS FOREST SOILS
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DOI：
10.1016/0038-0717(94)00140-v
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发表时间：
1995-02-01
影响因子：
9.7
通讯作者：
FRITZE, H
中科院分区：
文献类型：
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作者：
BAATH, E;FROSTEGARD, A;FRITZE, H
腐殖质磷脂脂肪酸（PLFA）分析用于清除，木灰施肥（应用量：1000，2500，5000公斤公顷-1），或规定烧毁（无论是在站立和清除）针叶林，研究处理对微生物生物量和群落结构的影响。与对照相比，木灰施肥、皆伐和两种不同的火烧处理的微生物量（PLFA总量）显著降低。真菌出现更严重的减少，这些治疗比细菌，揭示了一个减少指数的真菌：细菌PLFA相比，控制。利用PLFA模式对群落结构进行了评价。最大的治疗效果是由于在研究的两个领域的燃烧，这导致增加16：1 Ω 5和比例下降18：2 Ω 6。皆伐和不同数量的灰应用程序导致类似的变化，在PLFA模式的燃烧处理，但这些都不太明显。试图将PLFA模式的变化与土壤pH值、细菌pH响应模式（使用胸苷掺入法测量）或底物质量（使用IR光谱法测量）相关联，但仅部分成功。相反，我们假设PLFA模式的土壤生物的变化有关的改变基板量，即处理后的基板的可用性。
Humus phospholipid fatty acid (PLFA) analysis was used in clear-cut, wood-ash fertilized (amounts applied: 1000, 2500, and 5000 kg ha-1), or prescribed burned (both in standing and clear-cut) coniferous forests to study the effects of treatments on microbial biomass and community structure. The microbial biomass (total PLFAs) decreased significantly due to the highest rate of wood-ash fertilization, clear-cutting and the two different fire treatments when compared to control amounts. Fungi appeared more seriously reduced by these treatments than bacteria, as revealed by a decreased index of fungal:bacterial PLFAs when compared to the controls. The community structure was evaluated using the PLFA pattern. The largest treatment effect was due to burning in both areas studied, which resulted in increases in 16:1 omega5 and proportional decreases in 18:2omega6. Clear-cutting and the different amounts of ash application resulted in similar changes in the PLFA pattern to the burning treatments, but these were less pronounced. Attempts to correlate the changes in the PLFA pattern to soil pH, bacterial pH response patterns (measured using thymidine incorporation), or substrate quality (measured using IR spectroscopy) were only partly successful. Instead, we hypothesize that the changes in the PLFA pattern of the soil organisms were related to an altered substrate quantity, that is the availabilty of substrates after the treatments.