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1. Full Name: Nguyen Viet Khoa
2. Sex: Male
3. Date of birth: 07th December, 1980
4. Place of birth: Hanoi
5. Admission decision number: 2385/SĐH dated 29/6/2007
6. Changes in academic process: (none)
7.Official thesis title: “Studying and evaluating CO2 sequestration capacity and soil amelioration of Hybrid Acacia ( Acacia mangium x Acacia auriculiformi forests in some Northern mountainous provinces of Vietnam”
8. Major: Soil and water environment
9. Code 62 85 02 05
10. Supervisors: Pro. PhD. Le Van Khoa
11. Summary of the new findings of the thesis:
Establishing relationship between biomass of individual trees, biomass of of forest plantation, CO2 sequestrated by individual tree; forest plantation Hybrid Acasia with diameter D1/3, height and age of tree, density per hecta. That is bassis for establishing tables for fresh biomass mass, CO2 sequestrated by individual trees and forest plantation based on above mentioned key survey elements. Evaluating soil amelioration capacity of Hybrid Acacia Forest, with the folowing conclusions:
Average ratio of dry biomass compared to fresh biomass is 45,97%, approximately 46%.
In the individual tree of Hybrid Acacia, the carbon amount mainly concentrated in trunk (average is 54,31%), following is root (average is 16.40%), branch (average is 15,16%), leaves (on average is 8,58%), and lowest concentration
is tree cover (average is 5,54%). The CO2 absorbed through components is equivalent to carbon quantity inside such components.
The common coefficient of correlative equation between carbon and fresh living mass of individual tree is 0,24. The formula of absorbed CO2 = 0,88xP fresh can be applicable to make practical calculations.
Nine correlative equations of individual tree’s living mass with survey elements has been identified and 15 tables for living mass together with join and private carbon for each soil layer have also been specified. The error varies from 5,83% to 13,22%.
The Acacia mangium x Acacia auriculiformis has improved some physical characteristics of soil such as content of cấp hạt sét and reduction of natural weight of soil.
The fertility of soil for Acacia mangium x Acacia auriculiformis is also remarkable improved: improved pHkcl of humus total, N,P,K in total and increased irrigation capacity compared to the practice.
CEC, Ca2+ ,Mg2+ have been remarkably improved compared to the practical condition.
There is much more number of total microorganism, fix nitrogen microorganism in the Acacia mangium x Acacia auriculiformis forest compared to practical condition.
12. Practical applicability, if any:
Acacia mangium x Acacia auriculiformi forest owners, management/science agencies are able to apply research results to estimate fresh biomass mass, CO2 sequestrated by individual trees and forest plantation based on key survey elements.
13. Further research directions, if any: No
14. Thesis-related publications:
Nguyen Viet Khoa, evaluating soil environment of some agroforestry cultivation models in Luc Ngan District, Bac Giang province, Science and technology Journal of Agriculture and Rural Development, No2, 2007, page 67-72
Nguyễn Viết Khoa, Võ Đại Hải, Studying Carbon sequestration capacity by Acacia mangium x Acacia auriculiformis forest in the Northern Provinces of Vietnam; Science and technology Journal of Agriculture and Rural Development, No4, 2008, page 77-81
Nguyễn Viết Khoa, Research result on Biomass of Acacia mangium x Acacia auriculiformis forest In Hoa Binh and Phu Tho provinces; Science and technology Journal of Agriculture and Rural Development, No8, 2010, page 78-83.
Nguyễn Viết Khoa, Evaluating soil improvement capacity by (Acacia mangium x Acacia auriculiformis forest in Hoa Binh and Phu Tho Provinces; Science and technology Journal of Agriculture and Rural Development, No8, 2010, page 82-87.
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