Carbon stock in topsoil, standing floor litter and above ground biomass in <i>Tectona grandis</i> plantation 10-years after establishment in Ile-Ife, Southwestern Nigeria

Abstract

This paper provides information on carbon stock at the habitat level in the above ground biomass (ABG), standing floor litter and soils in a 10 year-old Tectona grandis plantation following restoration of a degraded secondary forest at Obafemi Awolowo University, Ile-Ife Nigeria. Four sample plots 25 m x 25 m, two in Tectona grandis plantation and two in a nearby degraded secondary forest were studied. Soil samples were randomly collected at 0-20 cm and bulk density determined. Standing floor litter was randomly collected at five points every three months for one year, sorted into different litter components. Soil and standing floor litters carbon concentration and C stock were determined. Above ground biomass (ABG) and carbon stock were significantly (p=0.003 and p=0.0001) higher in the plantation, the order is ABG > soil > standing floor leaf litter > standing floor wood litter. Soil C stock varies from 10.47 t ha-1 in the plantation to 10.58 t ha-1 C in the forest. Above ground biomass, standing leaf and wood litter were estimated as 18.26-5.81, 0.49-0.36, 0.06-0.08 t ha-1 C, respectively (plantation to secondary forest). Reforestation after 10 years has increased C stocks by 45% in ABG in the plantations.

Carbon Sequestration Potentials of Woody Plant Species in Makurdi Zoological Garden Benue State Nigeria

“…Tree aboveground biomass per plot was estimated by the summation of the TAGB of all individual trees in the plot. The total AGB for the studied area (1512.7 tonha -1 ) was higher when compared with [25] assertion that the global AGB in tropical dry and wet forest range between 30-275 tonha -1 and 213-1173tonha -1 respectively and that recorded in Ile-Ife (54.52 tonha-1 ) and reported by [26] but was smaller when compared with other studies. [14] estimated above ground biomass to be an average 215 mg tonha -1 and 192 mg tonha -1 for undisturbed tropical forest of Asia and the world respectively and also with study carried out by [27] that the total AGB of Oluwa forest of Ondo state was 162,826.343 tonha -1 that is, 162 mg tonha -1 .…”

“…E.g. 152 mg t c/ha for cocoa agroforestry in South Cameroon [28]; 66-88 mg t c/ha for rubber plantation in Cameroon [29] but however higher than the value of carbon stock recorded in Ile-Ife (28.18) reported by [26]. A total of 3331.04 ton ha -1 of CO 2 was estimated to have been sequestered in the area.…”

Litter fall and standing crop litter of<i> Bambusa vulgaris</i> Schrad. ex J.C. Wendl. stands in secondary rainforest in Ile-Ife, Nigeria

“…Data on standing crop litter in the bamboo and even in the tropics were generally lacking. Odiwe et al (2012) have pointed out that the amount of standing floor litter is influenced by the recovery from disturbance (reforestation). The variation in the litter fall production of bamboo stands compared to tree species in the secondary rainforest in this study area may be attributed to the nature of species (Borisade and Odiwe, 2018), differences in biomass production (Hosking, 2003), canopy development (Shanmughavel et al, 2001) and percentage of deciduousness (Odiwe and Muoghalu, 2003).…”

Evaluation of Carbon Stock across Different Forest Physiognomy in a Tropical Rainforest Ecosystem at Obafemi Awolowo University Ile-Ife, Nigeria

“…Chavan and Rasal [34] reported total standing carbon stock for Mangifera indica to be 82.83 Mg C ha -1 in India. Odiwe et al [21] reported aboveground carbon stock in Tectona grandis plantation to be 38.33 Mg C ha -1 in Nigeria. Chittachumnonk et al [22] in their study on carbon sequestration of T. grandis plantations in Thailand reported aboveground carbon stocks of 78.15 Mg C ha -1 .…”