楚科奇海和加拿大海盆表层沉积物中好气异养细菌的地理分布

GEOGRAPHICAL DISTRIBUTION OF GENERAL AEROBIC HETEROTROPHIC BACTERIA IN SURFACE SEDIMENTS FROM THE CHUKCHI SEA AND CANADIAN BASIN

本文用MPN法测定楚科奇海和加拿大海盆表层沉积物中好气异养细菌(GAB)的含量,并对其地理学分布进行分析。结果表明,研究区GAB的检出率高达100%。4℃时GAB的含量范围、平均含量为4.00×102—2.40×106个.g-1、1.71×106个.g-1。25℃时GAB的含量范围、平均含量为2.40×105—2.40×107个.g-1、1.10×107个.g-1。无论是含量范围,还是平均含量,均是25℃时的培养结果大于4℃时的培养结果。GAB含量的地理分布趋势是随纬度增高,含量呈降低趋势。在经度变化上则为由东向西,含量呈降低趋势。对沉积物所处水深的分析,表明其在4℃培养得出来的GAB含量随水深增加有下降的趋势,25℃培养出来的GAB含量受环境影响较小,与水深变化关系不明显。

This paper determined the abundance of General Aerobic heterotrophic Bacteria （GAB） in surface sediments from the Chukchi Sea and the Canadian Basin by using MPN and discussed their geographical distribution. The result showed that the determination percentages of the GAB were high, even till 100%. The abundance range and averages of GAB for 4℃ and 25℃ were 4.00 ×10^2--2.40 × 10^6, 1.71 × 10^6 cell· g^-1 （ wet sample ） and 2.40 ×10^5--2.40 ×10^7, 1.10 × 10^7 cell· g^- 1 （ wet sample ） respectively. Not only the abundance range but also the averages of GAB at 25℃ were higher than that at 4℃. The abundance of GAB in sediments showed a tendency of roughly higher in the lower latitudinal area than in the higher latitude. The abundance of GAB increased from east to west in longitude. With the water depth increasing, the abundance of GAB at 4℃ decreased, but it＇ s different at 25℃. It seemed that warmer circumstantial temperature was more suitable for some GAB.