| dc.description.abstract |
Fine root dynamics improves soil health and resilience, reducing climate
change and providing clear air condition. However, belowground carbon storage
potential of green landscape especially through fine root production (FRP) remains
poorly explored. Hence, to investigate the fine root dynamics and storage capacity in
the green landscape was conducted in the three campuses of Bahir Dar University
namely: Peda, Gish-Abay and Zenzelma campuses. The study focuses on fine roots <2
mm in diameter and aimed to estimate FRP and its turnover rate (ToR) using the
ingrowth core method of experimental research design with systematic root sampling
technique and the data was analysed by using general linear model of multivariate
analysis. In total 96 sampling plots was used and 288 consecutive monthly samples
were collected over the course of a year. The samples were taken at four different soil
depths (0–10, 11–20, 21–30 and 31–40). Additionally, I was compared the monthly
production of fine roots by using 120 root samples collected from different growth
month intervals of (1, 2, 3, 6 & 12) (November, December, January, April and
October). The mean annual fine root dynamics were calculated using the Decision
Matrix method used to calculate the decomposed root by subtracting continuous
biomass from interval biomass production and finally got the annual production.
Annual fine root production (AFRP) from 0–40 cm soil depth was higher (796 gm
1
) in the open grassland (OGL) than (631 gm
-2
yr
-1
) from under the canopy of scattered
trees (UCS) in the continuous root harvesting month of a year. However, in the same
depth from interval root sampling months (928 and 714gm
-2
yr
-1
) in the OGL and UCS
respectively. Vertical distribution of FRP was higher in a soil depth of 0–10 cm
(50.5%) than 11–20, 21–30, and 31–40 cm (28%, 15.3% and 6.1%) in the OGL and
55% in 0–10 cm than 11–20, 21–30 and 31–40 cm (29.1%, 12.3% and 3.2%) in the
UCS from the continuous growing month. Vertical fine root distribution from an
interval sampling technique shows the same trend with the continuous growing
period. The higher AFRP was occurred in the summer season (221 gm
) and
decomposition was peaked in summer (127 gm
-2
) in the OGL. Fine root ToR in the
OGL is 2.7 yr
-1
and 2.5yr
-1
for UCS. |
en_US |