Effects of grazing on photosynthetic characteristics of major steppe species in the Xilin River Basin, Inner Mongolia, China

Title:

Effects of grazing on photosynthetic characteristics of major steppe species in the Xilin River Basin, Inner Mongolia, China

Creator:

Chen, S. P., Bai, Y. F., Lin, G. H., Liang, Y., and Han, X. G.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:ff58cbe7-c14c-4822-968c-6c1dde8ded50
uuid:ff58cbe7-c14c-4822-968c-6c1dde8ded50
issn:0300-3604
doi:10.1007/s11099-005-0088-9

Subject:

intercellular CO2 concentration, net photosynthetic rate, overgrazing restoration, species composition, stomatal conductance, transpiration, and water use efficiency

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Species composition and photosynthetic characteristics of dominant species of ungrazed plot (UG), overgrazed plot (OG), and restored grazed plot (RG) were determined in the Xilin River Basin, Inner Mongolia, China. Both heavily grazing and restoration significantly affected the composition of different species and life forms. Leymus chinensis, Stipa grandis, and Cleistogenes polyphylla, three dominant perennial grasses in UG plot, contributed 58.9 % aboveground biomass to that of whole community, and showed higher net photosynthetic rate (PN), transpiration rate (E), and intrinsic water-use efficiency (WUE). In OG plot, relative biomass of L. chinensis and S. grandis significantly decreased, while relative biomass of three shrubs/sub-shrubs, Caragana microphylla, Artemisia frigida, and Kochia prostrata, obviously increased. Heavy grazing significantly decreased PN, E, and WUE of L. chinensis and S. grandis, while shrubs/sub-shrubs showed significantly higher photosynthetic activity and WUE than the grasses. After 18-year restoration, photosynthetic activities of L. chinensis and S. grandis were significantly higher than those in the OG plot. The proportion of L. chinensis, S. grandis, and C. microphylla significantly increased, and relative biomass of C. polyphylla, A. frigida, and K. prostrata markedly declined in RG plot. We found close relationships between physiological properties of species and their competitive advantage in different land use types. Higher photosynthetic capability means more contribution to total biomass. The variations in physiological characteristics of plants could partly explain the changes in species composition during degrading and restoring processes of Inner Mongolia typical steppes. and S. P. Chen ... [et al.].

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

559-565

Source:

Photosynthetica | 2005 Volume:43 | Number:4

Harvested from:

CDK

Metadata only:

false