Study On Biomass And Carbon Storage Of Haloxylon Ammodendron Community In Gurbantunggut Desert

Haloxylon ammodendron(H. ammodendron) was the edificators and dominant species in Gurbantunggut desert,it is important to research biomass and carbon pool of H. ammodendron community. The study was conducted on the basis of 10 permanent plots in study area,and each tree in the plots was measured. We had estmiated biomass and carbon storage of H. ammodendron community with the measured value of carbon content and wood density. Through measurement data and model analysis,basic conclusions are as follows:(1) The carbon storage of each component aboveground increased proportionally with the increasing of tree age class, especially in the age class 8th to 9th were increased rapidly. The total carbon storage of each component descending order: the trunk, stem diameter ≥3 cm branch, stem diameter 1-3cm branch, stem diameter<1 cm branch, assimilation branches. The carbon storage increased slowly and evenly with the increasing of wood density. Carbon density of different slope:windward >interdune> leeward. The total carbon density of different age class H. ammodendron changed as a curve, and the biggest was the fourth, and it increased smoothly from first to fourth, while decreased smoothly from fourth to eighth.(2) Carbon content of the root moved between 0.4968 and 0.5105, and increased with the increasing of age class, and descended order: taproot(>5mm), root(2-5mm), fine root(<2mm). The carbon storage of the root increased with the increasing of its wood density, and the added value from eighth to nineth age class is lager than other age class, the maximum was the nineth. The carbon density of underground changed as a curve with the increasing of age class, and the maximum was the fourth.(3) Carbon content of the different components litter decreased rapidly in the initial decomposition process, and tended towards stability. There were difference in the carbon content among different components, and the maximum was thick branch(0.5322), while the minimum was assimilation branch(0.5164). The decomposition rate in experimental station was obviously greater than the desert, and the maximum was assimilation branch, while the minimum was root, then followed thin branch and thick branch. The decomposition rates per year descended order: assimilation branch(0.1970), thin branch(0.1875), thick branch(0.726), root(0.1441).(4) Carbon content of two soils were 0.257 and 0.373g/kg, and the salt was greater than the sand. There have obviously difference in soil carbon density between the two soils, and were 0.203, 0.427, respectively. The soil carbon density of the investigated depth changed between 0.01-0.17kg/m2. The carbon storage of 0-10 cm soil made up 23.7%-32.8% of the total, and more than 82.4% in 0-50 cm. The carbon storage of the salt and the sand were 4.27, 2.03t/hm2 respectively.(5) The carbon content of shrub and herb is 0.4384, 0.3913, respectively. The carbon storage of H. ammodendron community in the Gurbantunggut desert was revealed,which was 1919×104t in total,with a density of 5815.7183kg·hm-2,and 1.53% higher using actual carbon content than the default value(0.5). The study has supplied a gap in the study of carbon storage in the Gurbantunggut desert.