太湖沉积物微生物生物量及其与碳、氮、磷的相关性

应用生态学报 ›› 2012, Vol. 23 ›› Issue (07): 1921-1926.

太湖沉积物微生物生物量及其与碳、氮、磷的相关性

王娜¹,徐德琳¹,郭璇²,吴筱清¹,安树青^1**

（¹南京大学生命科学学院/湿地生态研究所，南京 210093； ²苏州高新区虎丘区林业站，江苏苏州 215011）

出版日期:2012-07-18 发布日期:2012-07-18

Microbial biomass and its correlations with carbon, nitrogen, and phosphorus in the sediments of Taihu Lake.

WANG Na¹, XU De-lin¹, GUO Xuan², WU Xiao-qing¹, AN Shu-qing¹

(¹Institute of Wetland Ecology/School of Life Science, Nanjing University, Nanjing 210093, China; ²Forestry Station of New District and Huqiu District of Suzhou, Suzhou 215011, Jiangsu, China)

Online:2012-07-18 Published:2012-07-18

摘要/Abstract

摘要： 对太湖沉积物中微生物生物量碳（MB-C)、氮(MB-N)、磷(MB-P)，以及沉积物总有机碳(TOC)、总氮(TN)、总磷(TP)进行测定并进行相关性分析，揭示太湖沉积物微生物对太湖沉积物营养盐的响应及反馈特征.结果表明：沉积物微生物生物量（MB）在湖体沿岸地区大于湖心区，平均值为184.66 mg·kg^-1，MB-C在西部沿岸区以及竺山湾和梅梁湾区域较高，平均值为127.57 mg·kg^-1；MB-N在梅梁湾、贡湖部分区域以及靠近梅梁湾和贡湖的湖心区域和东部沿岸区较高，平均值为19.25 mg·kg^-1；MB-P在东部沿岸区及其附近的湖心区最高，平均值为19.09 mg·kg^-1；沉积物TOC高值区（≥2.30 g·kg^-1）主要集中在竺山湾、西部沿岸区、梅梁湾、贡湖地区，平均值为1.59 g·kg^-1；沉积物TN高值区（≥0.30 g·kg^-1）主要集中在贡湖、梅梁湾、竺山湾部分地区以及西部沿岸区，平均值为0.21 g·kg^-1；沉积物TP高值区（≥1.20 g·kg^-1）主要集中在东部沿岸区以及湖心部分区域，平均值为0.55 g·kg^-1；太湖沉积物TOC/TN在7～19，平均值为8.97，表明太湖沉积物中的有机质具有明显的双重来源，其中陆源有机质主要集中在西部沿岸区；太湖沉积物MB与沉积物TOC和TN呈显著正相关，与沉积物TP相关性不显著；沉积物MB-C/MB-N与沉积物TOC/TN显著相关.太湖沉积物微生物主要受沉积物TOC、TN影响，且沉积物TOC/TN的变化显著影响微生物群落结构.

Abstract: To explore the responses and feedbacks of the microbes in the sediments of Taihu Lake to the sediment nutrients, an investigation was made on the microbial biomass carbon (MB-C), microbial biomass nitrogen (MB-N), microbial biomass phosphorus (MB-P), and their correlations with the total organic carbon (TOC), total nitrogen (TN), and total phosphorus (TP) in the sediments. The microbial biomass in the sediments was 184.66 mg·kg^-1, being higher at the lakeside than in the midlake region. The MB-C was higher in the western coastal region, Zhushan Bay, and Meiliang Bay, with an average of 127.57 mg·kg^-1, MB-N was higher in Meiliang Bay, Gonghu Bay, midlake region close to Meiliang Bay and Gonghu Bay, and eastern costal region, with an average of 19.25 mg·kg^-1, and MB-P was higher in the eastern region and parts of the midlake region, with an average was 19.09 mg·kg^-1. The TOC high value zone (≥2.30 g·kg^-1) was mainly in Zhushan Bay, western coastal region, Meiliang Bay, and Gonghu Bay, with an average of 1.59 g·kg^-1, TN high value zone (≥0.30 g·kg^-1) was mainly in the Gonghu Bay, Meiliang Bay, Zhushan Bay, and western costal region, with an average of 0.21 g·kg^-1, and TP high value zone
(≥1.20 g·kg^-1) was mainly in the eastern coastal region and parts of the mid-lake region, with an average of 0.55 g·kg^-1. The TOC/TN ratio in the sediments was 7-19, with an average of 8.97, which showed that the organic substances in the sediments had obvious dual sources, among which, terrestrial organisms were mainly in the west side of the lake. The microbial biomass in the sediments was significantly positively correlated with sediment TOC and TN but had less correlation with sediment TP, and the MB-C/MB-N was significantly correlated with sediment TOC/TN, suggesting that the microbes in the sediments of Taihu Lake were mainly affected by the sediment TOC and TN, and the changes of the TOC/TN had significant effects on the microbial community structure.

王娜1,徐德琳1,郭璇2,吴筱清1,安树青1**. 太湖沉积物微生物生物量及其与碳、氮、磷的相关性[J]. 应用生态学报, 2012, 23(07): 1921-1926.

WANG Na1, XU De-lin1, GUO Xuan2, WU Xiao-qing1, AN Shu-qing1. Microbial biomass and its correlations with carbon, nitrogen, and phosphorus in the sediments of Taihu Lake.[J]. Chinese Journal of Applied Ecology, 2012, 23(07): 1921-1926.