By ENGR. LYRAE A. CASIDSID EVANGELINE T. CASTILLO, Ph.D./ DENR-ERDB

1. IMPROVED REHABILITATION TECHNOLOGIES FOR HIGHLY VULNERABLE AND SEVERELY ERODED AREA IN TUBORAN, MAWAB, COMVAL, REGION XI By ENGR. LYRAE A. CASIDSID EVANGELINE T. CASTILLO, Ph.D./DENR-ERDB FLORITA E. SIAPNO, Ph.D./DENR-ERDB Presented by LYRAE A.CASIDSID (DENR-ERDB/MDARRC)

2. INTRODUCTION • Soil erosion and degradation in the Philippines is estimated at 8.3 M ha out of 30 M ha total area of the country (EMB,1990 as cited by Lasco and Pulhin, 2006) • In this study, improved rehabilitation strategies/ technologies were employed through the modification of existing technologies like the coco mat technology • Standard methodological procedures of best technologies could be developed from verified technologies that could be employed for large-scale rehabilitation of damaged ecosystems

3. OBJECTIVES General: To come up with successfully rehabilitated damaged areas out of verified technologies and research information that could serve as a basis for large-scale rehabilitation of damaged ecosystems. Specific: 1.To determine the survival, height and diameter growth of trees under two rehabilitation technologies. 2. To determine the cost of the tested rehabilitation technologies. 3. To determine soil erosion of the two rehabilitation technologies and control.

4. METHODOLOGY Location of the study: Tuboran, Mawab, Compostela Valley in Region XI Seedling Production: Four species trees were raised in the nursery for four months; cuttings of forage peanut were likewise propagated in the nursery. Site Characteristics: Barangay Tuboran is characterized by hilly and rolling areas; climate is favorable and belongs to Type II. The site was dominated by cogon and other species with an average slope of 37% and a south eastern aspect. The soil is clay loam to loam and heavy-textured with a depth that ranges from 55-85 cm; bulk density from 0.94 to 1.57 g/cu.cm.; and water holding capacity from 56.30 to 71.05 %.

5. METHODOLOGY Establishment of Random Plots: • Plot 1 – applied with coco mat technology in combination with 120 seedlings of tree species (1 m x 1m spacing) and 3,040 cuttings of forage peanut (0.5m x 0.5m spacing). • Plot 2 - applied with vegetative technology in combination with 120 seedlings of tree species (1 m x 1m spacing)and 3,040 cuttings of forage peanut (0.5m x 0.5m spacing). • Plot 3 – Control Plot ( without intervention) Collection of data: Survival, height and diameter and survival of test plants; Soil Loss and Rainfall Analysis of data: Data were analysed using T-test (2-tailed)

6. RESULTS AND DISCUSSION Figure 1. Mean quarterly survival (%) of trees under two rehabilitation technologies

7. RESULTS AND DISCUSSION Figure 1. Mean quarterly height increment (cm) of trees under two rehabilitation technologies

8. RESULTS AND DISCUSSION Figure 1. Mean quarterly diameter increment (cm) of trees under two rehabilitation technologies

9. RESULTS AND DISCUSSION Table 1. Mean Survival, diameter and height increment of four tree species under two rehabilitation technologies

10. RESULTS AND DISCUSSION Table 2. Total annual soil erosion (tons/hectare/year) of the two rehabilitation technologies and control for two years

11. CONCLUSION AND RECOMMENDATION Rehabilitation of severely eroded area in Tuboran, Mawab, Compostela Valley using coco mat technology had a highly significant effects on the high survival of mahogany, narra and African tulip and highly significant effects on the higher height growth of narra and significant effects for falcata and mahogany, thus, open and damaged site became productive for carbon sequestration and climate change mitigation. Therefore, it is recommended that coco mat technology in combination with the selected tree species be used in the rehabilitation of highly vulnerable and severely eroded areas of Tuboran, Mawab, Compostela Valley condition.

12. DAGHANG SALAMAT

13. Time-Series Satellite Imagery from Google earth (2009-2016) 2010 2009 2014 2016