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Abiotic and biotic factors modulate plant biomass and root/shoot (R/S) ratios in grassland on the Loess Plateau, China
Yang Yang1; Yanxing Dou2; Shaoshan An1,2; Zhaolong Zhu2; An, SS (reprint author), Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Rd Xinong 26, Yangling 712100, Shaanxi, Peoples R China.
SubtypeArticle
2018
Source PublicationSCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
description.correspondentemailshan@ms.iswc.ac.cn
Volume636Pages:621-631
AbstractPlant biomass and the root/shoot ratio (R/S) are key parameters for estimating terrestrial ecosystem carbon (C) stocks. However, how environmental driving factors (abiotic and biotic factors) modulate plant biomass and R/S has not been well investigated on the Loess Plateau. Here, we tested the impacts of abiotic and biotic driving factors on plant biomass and R/S and whether they are in accordance with optimal partitioning theory in natural grassland in this region. The results showed that above-ground biomass (AGB) and below-ground biomass (BGB) were 63.96 g.m(-2) and 311.18 g.m(-2), respectively, and that R/S ranged from 0.13 to 0.46, with high spatial heterogeneity. There was a strong positive linear relationship between AGB and BGB (p < 0.05) in accordance with optimal partitioning theory. A principal component analysis (PCA) indicated that the topographic properties (Slope position, Slope gradient and Altitude) were negatively correlated with the soil physical properties (Ec, Electric conductivity; BD, Bulk density; ST, Soil temperature; and SM, Soil moisture) and positively correlated with the soil chemical properties (SOC, Soil organic carbon; TN, Total nitrogen; SMBC, Soil microbial biomass carbon and SMBN, Soilmicrobial biomass nitrogen), while soil total phosphorus (TP) was not correlated with the soil physical properties (p > 0.05). Structural equation modeling (SEM) suggested that R/S is indirectly driven by plant properties (Height, Density, Coverage), which are determined by soil and topographic properties. However, only 5% of R/S was explained by the soil physical properties and topographic properties, suggesting that these factors had no significant effect on R/S. The data do, however, provide information for quantifying C stocks in natural grassland on the Loess Plateau. Further, ecologists should focus on mechanistic and fresh approaches to understanding the abiotic and biotic factors influencing plant biomass and R/S. (C) 2018 Elsevier B.V. All rights reserved.
KeywordPlant Biomass Root/shoot Ratio Principal Component Analysis Structural Equation Modeling Grassland Loess Plateau
Subject AreaEnvironmental Sciences & Ecology
DOI10.1016/j.scitotenv.2018.04.260
Indexed BySCI
Publication PlacePO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language英语
WOS IDWOS:000436599000061
PublisherELSEVIER SCIENCE BV
Funding OrganizationNational Natural Science Foundation of China [41671280, 41771317] ; National Natural Science Foundation of China [41671280, 41771317] ; Special-Funds of Scientific Research Programs of the State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau [A314021403-C6] ; Special-Funds of Scientific Research Programs of the State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau [A314021403-C6]
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Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8183
Collection水保所科研产出--SCI_2018--SCI
Corresponding AuthorAn, SS (reprint author), Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Rd Xinong 26, Yangling 712100, Shaanxi, Peoples R China.
Affiliation1.Northwest A&F Univ, Coll Nat Resource & Environm, Yangling 712100, Shaanxi, Peoples R China
2.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Rd Xinong 26, Yangling 712100, Shaanxi, Peoples R China
Recommended Citation
GB/T 7714
Yang Yang,Yanxing Dou,Shaoshan An,et al. Abiotic and biotic factors modulate plant biomass and root/shoot (R/S) ratios in grassland on the Loess Plateau, China[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2018,636:621-631.
APA Yang Yang,Yanxing Dou,Shaoshan An,Zhaolong Zhu,&An, SS .(2018).Abiotic and biotic factors modulate plant biomass and root/shoot (R/S) ratios in grassland on the Loess Plateau, China.SCIENCE OF THE TOTAL ENVIRONMENT,636,621-631.
MLA Yang Yang,et al."Abiotic and biotic factors modulate plant biomass and root/shoot (R/S) ratios in grassland on the Loess Plateau, China".SCIENCE OF THE TOTAL ENVIRONMENT 636(2018):621-631.
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