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标题

一个温带草原上土壤病毒和细菌多度对 若干环境变化因子的响应

作者

张粉果 朱璧如 张全国 张大勇

机构

北京师范大学生物多样性与生态工程教育部重点实验室

摘要

依托内蒙古多伦全球变化多因子实验,调查了温带草原土壤病毒和细菌的多度对长期割草、氮磷营养添加、 水分增加、增温处理这几个环境变化因子的响应.发现多伦草地土壤的干土样本中病毒和细菌多度分别为2×108 和 2×107·g-1.割草以及氮或磷资源添加对病毒和细菌多度没有显著影响.相当于年均降水量1/3的水分增加导致细菌多 度增加近58%,1.6℃左右的增温处理导致细菌多度上升31%;这二者对病毒多度没有显著影响.研究结果表明:包括湿 度和温度在内的环境因子,而非资源水平,更可能是该区域土壤细菌生长的限制性因子;水分增加和升温应该可以通过 增加细菌数量而对病毒产生间接的正面作用,但它们很可能同时对病毒产生了直接的负面影响(比如更高的死亡率),这 些影响相互抵消.这些结果暗示病毒对气候变暖与土壤微生物响应之间的反馈关系可能有重要影响.

关键词

病毒多度;细菌多度;病毒-细菌多度比;割草;添加氮;添加磷;添加水分;增温

引用

张粉果, 朱璧如, 张全国, 张大勇.一个温带草原上土壤病毒和细菌多度对 若干环境变化因子的响应[J]. 北京师范大学学报(自然科学版),2015,51(6):595-601.

基金

国家自然科学基金资助项目(31222010,31421063)

分类号

Q938.1

DOI

10.16360/j.cnki.jbnuns.2015.06.011

Title

Soil viruses and bacteria responses to several environmental change factors in a temperate steppe

Author

ZHANG Fenguo, ZHU Biru, ZHANG Quanguo, ZHANG Dayong

Affiliations

MOE Key Laboratory for Biodiversity Science and Ecological Engineering, Beijing Normal University

Abstract

The abundances of soil viruses and bacteria in a 7-year field experiment which addresses the long-term ecosystem consequences of mowing, nutrient addition, water addition, and temperature elevation in a temperate steppe in northern China are reported here. The estimated viral and bacterial abundances in this field were 2 × 108 and 2× 107 /g dry soil, respectively. The viral and bacterial abundances were not altered by mowing or nitrogen / phosphorus addition. Water addition and temperature elevation increased significantly bacterial abundance (by 58% and 31%, respectively), with no significant changes in viral abundance, which implies negative direct effects of these two environmental factors on viral survival or growth. These results suggest that bacterial growth in this soil may have been limited by environmental conditions such as moisture content and temperature, but not by resource availability. We also discussed the role viruses may play in the feedback between climate warming and microbial responses.

Key words

viral abundance; bacterial abundance; virus-to-bacterium ratio; mowing; N addition; P addition; water addition; warming

cite

ZHANG Fenguo, ZHU Biru, ZHANG Quanguo, ZHANG Dayong. Soil viruses and bacteria responses to several environmental change factors in a temperate steppe[J]. Journal of Beijing Normal University(Natural Science),2015,51(6):595-601.

DOI

10.16360/j.cnki.jbnuns.2015.06.011

Copyright © 2014 Journal of Beijing Normal University (Natural Science)
Designed by Mr. Sun Chumin. Email: cmsun@mail.bnu.edu.cn