|本期目录/Table of Contents|

[1]李杨,仲波,陈冬明,等.不同浓度和多样性的根系分泌物对土壤团聚体稳定性的影响[J].应用与环境生物学报,2019,25(05):1061-1067.[doi:10.19675/j.cnki.1006-687x.2018.12036]
 LI Yang,,et al.Effects of root exudates of different carbon concentrations and sources on soil aggregate stability[J].Chinese Journal of Applied & Environmental Biology,2019,25(05):1061-1067.[doi:10.19675/j.cnki.1006-687x.2018.12036]
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不同浓度和多样性的根系分泌物对土壤团聚体稳定性的影响
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《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
25卷
期数:
2019年05期
页码:
1061-1067
栏目:
研究论文
出版日期:
2019-10-31

文章信息/Info

Title:
Effects of root exudates of different carbon concentrations and sources on soil aggregate stability
作者:
李杨仲波陈冬明张楠楠孙庚
1中国科学院山地生态恢复与生物资源利用重点实验室,生态恢复与生物多样性保育四川省重点实验室,中国科学院成都生物研究所 成都 610041 2中国科学院大学 北京 101408 3四川省甘孜藏族自治州畜牧业科学研究所 康定 626000 4中国-克罗地亚生物多样性和生态系统服务“一带一路”联合实验室,中国科学院成都生物研究所 成都 610041
Author(s):
LI Yang1 2 4 ZHONG Bo1 2 4 CHEN Dongming3 ZHANG Nannan1 4** & SUN Geng1 4**
1 CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China 2 University of Chinese Academy Sciences, Beijing 100049, China 3 Sichuan Ganzi Tibeta Autonomous Prefecture Institute of Animal Husbandry Science, Kangding 626000, China 4 China-Croatia “Belt and Road” Joint Laboratory on Biodiversity and Ecosystem Services, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
关键词:
土壤团聚体根系分泌物团聚体结构微生物生物量
Keywords:
soil aggregate root exudate aggregate structure microbial biomass
分类号:
Q948.113
DOI:
10.19675/j.cnki.1006-687x.2018.12036
摘要:
土壤团聚体是维持其物理结构和肥力的基础. 为探究根系分泌物的浓度和多样性对土壤团聚体稳定性的影响,通过添加不同碳浓度(0.5 g/kg、1 g/kg)和多样性(3种碳源、9种碳源)人工模拟根系分泌物,研究土壤团聚体稳定性、粒级结构及其内部微生物生物量的变化. 结果显示:(1)与对照相比,添加根系分泌物提高了土壤团聚体的稳定性,平均质量直径(Mean weight diameter,MWD)数值增加了28%-142%,几何平均直径(Geometric mean diameter,GMD)增加了20%-33%;(2)与低碳浓度根系分泌物相比,高碳浓度根系分泌物显著增加团聚体稳定性,且主要是通过增加> 2 mm粒级团聚体的含量和微生物生物量碳;而根系分泌物多样性的增加并未提高团聚体的稳定性,也未增加> 2 mm粒级团聚体的含量和微生物生物量碳,其中在高碳浓度+低多样性处理(High carbon concentrations + low diversity, HC + LD)下> 2 mm粒级团聚体的含量显著增加了560倍,> 2 mm粒级团聚体中微生物生物量碳增加了3.6倍. 本研究表明根系分泌物能够通过刺激微生物生长,增加土壤中大粒级团聚体的含量,进而提高团聚体的稳定性,其效应与根系分泌物的浓度和成分显著相关. (图3 表2 参37 附图1)
Abstract:
Soil aggregates maintain the physical structure and fertility of soil. To explore the effects of different concentrations and the diversity of root exudates on soil aggregate stability, different carbon concentrations (0.5 g/kg and 1 g/kg) and sources (three carbon sources and nine carbon sources) from artificially simulated root exudates were used to study the stability of soil aggregates, the associated size structure, and the changes in soil microbial biomass. The results showed that (1) the addition of root exudates increased the stability of soil aggregates, while mean weight diameter (MWD) increased by nearly 28-142%, and geometric mean diameter (GMD) increased by nearly 20%-33%. (2) The root exudates with high carbon concentrations significantly increased aggregate stability, mainly by increasing the content of soil aggregates > 2 mm and microbial biomass carbon. The increase in root exudate diversity did not increase aggregate stability, and soil aggregates > 2 mm and microbial biomass carbon did not increase. In the high carbon concentration + low diversity treatment, the content of soil aggregates > 2 mm significantly increased 560-fold and microbial biomass carbon in soil aggregates > 2 mm increased 3.6-fold. This study shows that root exudates can increase the content of large-scale soil aggreate by stimulating microbial growth, thereby increasing the aggregate stability, and this effect is significantly correlated with the concentration and composition of root exudates.

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更新日期/Last Update: 2019-10-25