Autotrophic and heterotrophic components of soil respiration caused by rhizosphere priming effects in a plantation

被引：0

作者：

Song, Wenchen ^{[1
]}

Tong, Xiaojuan ^{[1
]}

Zhang, Jinsong ^{[2
]}

Meng, Ping ^{[2
]}

Li, Jun ^{[3
]}

机构：

[1] Beijing Forestry Univ, Coll Forestry, Beijing, Peoples R China

[2] Chinese Acad Forestry, Res Inst Forestry, Key Lab Tree Breeding & Cultivat, State Forestry Adm, Beijing, Peoples R China

[3] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing, Peoples R China

来源：

PLANT SOIL AND ENVIRONMENT | 2017年 / 63卷 / 07期

基金：

中国国家自然科学基金;

关键词：

forest ecosystem; nutrient cycling; stable isotope; microorganism; carbon dioxide; C-13; NATURAL-ABUNDANCE; ORGANIC-MATTER; CO2; EFFLUX; RHIZOMICROBIAL RESPIRATION; MICROBIAL BIOMASS; ROOT; FOREST; CARBON; MICROORGANISMS; DECOMPOSITION;

D O I：

10.17221/287/2017-PSE

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

Root-exudate inputs can stimulate the decomposition of soil organic carbon by priming microbial activity, but its ecological significance is still not fully understood. This study evaluated autotrophic respiration and heterotrophic respiration driven by roots using the C-13 natural abundance method in a Robinia pseudoacacia plantation. The results showed that the priming effect existed in deep soil of the plantation. The proportions of autotrophic respiration and heterotrophic respiration deriving from priming effect to total soil respiration varied with soil depth. Rhizomicrobial respiration (RMR) accounted for about 15% of the total soil respiration, and the rate of priming decomposition of soil organic matter (PSOM) was only about 5% of the total soil respiration. RMR was significantly positively correlated with PSOM. Heterotrophic respiration derived by the priming effect was too weak to have a positive impact on atmospheric CO2.

引用

页码：295 / 299

页数：5

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