Singh J S, Kashyap A K
Department of Botany, Banaras Hindu University, Varanasi 221005, India.
Microbiol Res. 2007;162(3):276-83. doi: 10.1016/j.micres.2006.06.008. Epub 2006 Jul 27.
Population dynamics of methane-oxidizing bacteria (MOB) was measured for 2 consecutive years for four forest and one savanna sites in seasonally dry tropical regions of India. The soils were nutrient-poor and well drained. These sites differed in vegetational cover and physico-chemical features of soils. There were significant differences in MOB population size during the 2 years (mean 0.40 and 0.48 x 10(5) cells g(-1) dry soil), and at different sites (mean 0.38-0.59 x 10(5) cells g(-1) dry soil). The mean population size of MOB was higher (P<0.05) in dry seasons than in the rainy season at all the sites. There was a significant season and site interaction, indicating that the effect of different seasons differed across the sites. There was a positive relation between soil moisture and MOB population size during summer (the driest period) and a negative relation during the rest of the year. The number of MOB was consistently higher for the Kotwa hill base site than rest of the sites having higher soil organic C and total N. The results suggested that in seasonally dry tropical forests the moisture, C and N status of the soil regulates the population size of MOB (methanotrophs) in the long term.
在印度季节性干燥热带地区的四个森林和一个稀树草原地点，连续两年对甲烷氧化细菌（MOB）的种群动态进行了测量。土壤养分贫瘠且排水良好。这些地点在植被覆盖和土壤理化特征方面存在差异。两年间MOB种群大小存在显著差异（平均为0.40和0.48×10⁵个细胞 g⁻¹干土），不同地点间也存在差异（平均为0.38 - 0.59×10⁵个细胞 g⁻¹干土）。在所有地点，MOB的平均种群大小在旱季均高于雨季（P<0.05）。存在显著的季节和地点交互作用，表明不同季节的影响在各地点间有所不同。在夏季（最干旱时期），土壤湿度与MOB种群大小呈正相关，而在一年中的其他时间呈负相关。科特瓦山基地点的MOB数量始终高于其他土壤有机碳和总氮含量较高的地点。结果表明，在季节性干燥的热带森林中，从长期来看，土壤的水分、碳和氮状况调节着MOB（甲烷氧化菌）的种群大小。
