In 2022, MTP collaborated with Guangxi Bangliang Gibbon National Nature Reserve and planted 544 trees in Dadu Tun. The tree species are Choerospondias axillaris and Ficus, microcarpa. The total area of trees planted is 0.55 hectares. The forest site is located in a key area of the habitat of Cao Vit Gibbon.
In February 2023, the weeding work was carried out on the plot. The team visited the site in June and October again, and conducted the forest survey. The sampling ratio of trees was 13.8%, and the overall survival rate was 72.72%. There was a drop from the survival rate of 77.46% in 2022, which was casued by the death of a few Choerospondias axillaris in the site. The amounts of Choerospondias axillaris and Ficus microcarpa was even initailly, but now the Choerospondias axillaris left was one third of the Ficus microcarpa. The average height of Choerospondias axillaris and Ficus microcarpa was respectively 1.84 m and 1.86 m, which were higher than 2022. The growing speed is common for the trees in these areas. Comparing the two tree species, the survival rate of Choerospondias axillaris was worse than Ficus microcarpa, but the survived Choerospondias axillaris grew better than Ficus microcarpa.
. The Average Heights of Choerospondias axillaris and Ficus microcarpa measured respectively in 2022 and 2023, Unit: m
The Average Basal Diameter and Diameter at Breast Height of Choerospondias axillaris and Ficus microcarpa, Unit: cm
The grass was growing very fast on the site, blocking the growth of the trees. More weed control work is needed. The multch films on the bottom of the trees remained, but there were a lot traces of animal activities on the grassland. The Fig trees in the middle of the site were badly damaged. The wounds looked like caused by the rodents such as Rhizomys.
Grass Growing Wildly on the plot of Nong Yu Mi, photo taken in October 2023
Gnawing Traces on Trunk and the Hole on the Bottom
The forest site is very difficult to reach and thus making it also very difficult to carry out the maintenance work. But it’s in the overlapping area of the habitat for three gibbon family groups, so very essential to the Cao Vit Gibbon Conservation. The team will continue forest visits, survey and maintenance work in 2024.