Assessment of the living and total biomass of microbial communities in the background chestnut soil and in the paleosols under burial mounds
Assessment of the living and total biomass of microbial communities in the background chestnut soil and in the paleosols under burial mounds
复制标题
板栗背景土和墓葬古土壤中微生物群落的活生物量和总生物量评估
DOI：
10.1134/s1064229311120064
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发表时间：
2011
影响因子：
1.4
通讯作者：
V. Demkin
中科院分区：
文献类型：
--
作者：
T. Khomutova;N. Kashirskaya;V. Demkin
测定了伏尔加河下游干草原现代栗子土和青铜和早期铁器时代（5000-1800年前）古土壤中总微生物生物量的磷脂和碳含量。根据微生物细胞中磷脂含量与有机碳含量的比值，计算微生物活生物量的碳含量，并与研究土壤中微生物总生物量和总有机碳含量进行比较。背景栗子土A1、B1和B2层的磷脂含量分别为452、205和189 nmol/g；在古土壤中，它是现在水平的28-130%。在5000年和2000年前埋藏的古土壤中测量到了最大的含量，在气候湿度增加的时期。背景栗子土微生物总生物量分别为5680 （A1层）、3380 （B1层）和4250 （B2层）μ C/g；而在古土壤中，这一数值要低2.5-7.0倍。背景土上层活微生物生物量占总生物量的比例远低于土丘下古土壤；其变化范围分别为8.5 ~ 15.3%和15 ~ 81%。活微生物量占背景栗子土总有机碳含量的比例约为4-8%。在铁器时代早期（2000年和1800年前）埋藏的古土壤中，这一数值不超过3-8%；在青铜时代（5000-4000年前）的古土壤中，它达到了总有机碳的40%。
The contents of phospholipids and carbon of the total microbial biomass were determined in the modern chestnut soil and in the paleosols buried under mounds of the Bronze and Early Iron Ages (5000–1800 years ago) in the dry steppe of the Lower Volga River basin. Judging from data on the ratio between the contents of phospholipids and organic carbon in the microbial cells, the carbon content of the living microbial biomass was calculated and compared with the total microbial biomass and total organic carbon in the studied soils. In the background chestnut soil, the content of phospholipids in the A1, B1, and B2 horizons amounted to 452, 205, and 189 nmol/g, respectively; in the paleosols, it was 28–130% of the present-day level. The maximum content was measured in the paleosols buried 5000 and 2000 years ago, in the periods with an increased humidity of the climate. In the background chestnut soil, the total microbial biomass was estimated at 5680 (the A1 horizon), 3380 (B1), and 4250 (B2) μg C/g; in the paleosols, it was by 2.5–7.0 times lower. In the upper horizons of the background soil, the portion of the living microbial biomass in the total biomass was much less than that in the paleosols under the burial mounds; it varied within 8.5–15.3% and 15–81%, respectively. The portion of living microbial biomass in the total organic carbon content of the background chestnut soil was about 4–8%. In the paleosols buried in the Early Iron Age (2000 and 1800 years ago), this value did not exceed 3–8%; in the paleosols of the Bronze Age (5000–4000 years ago), it reached 40% of the total organic carbon.