Impact of farm exclosure on woody species abundance and carbon stock in Tigray, Northern Ethiopia

Figures & data

Figure 1. Map of the study areas.

Table 1. Species composition of the sampled plots in farm exclosures and open farms

	Farm exclosures	Open farms
Total tree/shrub stems	190	120
Species	15	9
Family	10	7
Wood tree (%)	82.8	86.7
Shrub (%)	2.7	8.3
Fruit tree (%)	14.5	5
Dominant species	Faidherbia albida	Eucalyptus camaldulensis

Table 2. Mean woody species basal area, abundance, richness and Shannon index (H’)

	No. of plot	Richness	BA (m^2/plot)	Abundance/plot	Shannon index
Farm exclosure	18	2.72^a	0.55^a	10.67^a	1.74^a
Open farms	18	2.11^a	0.18^c	6.72^b	1.64^a
p Value		NS	<0.01	<0.05	NS

Different letters in the same row are significantly different. NS: not significant.

Table 3. Above-ground biomass (AGB), below-ground biomass (BGB), above-ground carbon stock (AGCS) and below-ground carbon stock (BGCS) in farm types (ton C ha⁻¹)

Farm type	AGB	BGB	TB	AGCS	BGCS	TCS
Exclosure	6.68 (±5.48)^a	2.47 (±2.03) ^a	9.16 (±7.50) ^a	3.34 (±1.01) ^a	1.24 (±2.74) ^a	4.58 (±3.75) ^a
Open farms	1.73 (±1.72)^b	0.64 (±0.64) ^b	2.37 (±2.36) ^b	0.86 (±0.86) ^b	0.32 (±0.32) ^b	1.18 (±1.17) ^b

^{Different letters in the same row are significantly different at p<0.01.}