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[1]李杨 仲波 陈冬明 张楠楠** 孙庚**.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):1-10.[doi:10.19675/j.cnki.1006-687x.2019.01035]
 LI Yang,ZHONG Bo,et al.Effects of the root exudates of different carbon concentrations and diversity on soil aggregate stability *[J].Chinese Journal of Applied & Environmental Biology,2019,25(05):1-10.[doi:10.19675/j.cnki.1006-687x.2019.01035]
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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:
1-10
栏目:
研究论文
出版日期:
2019-08-25

文章信息/Info

Title:
Effects of the root exudates of different carbon concentrations and diversity on soil aggregate stability *
作者:
李杨12 仲波12 陈冬明3 张楠楠1** 孙庚1**
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
Author(s):
LI Yang1 2 ZHONG Bo1 2 CHEN Dongming1 ZHANG Nannan1** SUN Geng1**
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
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 aggregates root exudates aggregate structure microbial biomass
DOI:
10.19675/j.cnki.1006-687x.2019.01035
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 C kg-1、1 g C kg-1)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的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。
Abstract:
Soil aggregates are the basis for maintaining their physical structure and fertility. To explore the effects of root exudates concentration and diversity on soil aggregate stability, the study added different carbon concentrations (0.5 g C kg-1, 1 g C kg-1) and diversity (3 carbon sources, 9 Carbon source) artificially simulated root exudates to study the stability of soil aggregates, the size structure and the changes of microbial biomass inside. The results showed that: 1) Compared with the control, the addition of root exudates increased the stability of soil aggregates, the MWD increased by nearly 28%-142% and the GMD increased by nearly 20%-33%; 2) Compared to high carbon concentrations, the root exudates with low carbon concentration significantly increased aggregates stability, and mainly by increasing the content of >2 mm size aggregates and microbial biomass carbon; while the increase in root exudate diversity did not increase aggregates stability, the >2mm size aggregates and microbial biomass carbon were not increased, While under the high carbon concentration + low diversity treatment, the content of >2mm size aggregates was significantly increased by 560 times and the microbial biomass carbon in the >2mm aggregates increased by 3.6 times. This study shows that root exudates can increase the content of large-scale aggregates in the soil by stimulating microbial growth, thereby increasing the stability of aggregates, and its effect is significantly correlated with the concentration and composition of root exudates.

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备注/Memo

备注/Memo:
收稿日期 Received: 2018-12-17 接受日期 Accepted: 2019-02-27
国家科技部重点研发项目(2016YFC0501803)、国家自然科学基金项目(31570517)、中国科学院STS(KFJ-STS-ZDTP-022-4)、四川省科技厅项目(2017SZ0080, 2017NFP0223, 2018NFP0107, 2018SZ0329)和九寨沟灾后恢复重建项目世界自然遗产恢复与保护研究资助
通讯作者 Corresponding author (E-mail: sungeng@cib.ac.cn, zhangnannan@cib.ac.cn)
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更新日期/Last Update: 2019-03-13