Monitoring Research On The Biomass Of Typical Of Main Forest Types In Xinjiang

The global climate change makes people pay more attention to the carbon sequestration of the forest, while the biomass is an important variable to precisely evaluate the carbon storage and carbon sink of the ecological system of forest. This paper chooses main forest tree species of Larix sibirica Ledeb, Populus alba var pyramidalis Bge and Abies sibirica Ledeb in Xinjiang as the research objects. It analyzes the distribution of biomass of organs of three tree species according to the different ages, studies the distribution and partition of biomass along the time, and establishes the dynamic changes of biomass and carbon storage of Larix sibirica Ledeb, Populus alba var pyramidalis Bge and Abies sibirica Ledeb in Xinjiang to provide the references for the study of forest biomass and productivity in Xinjiang and the basic data for the further estimation of carbon storage and carbon sink of the forest in Xinjiang. The research results are as follows:1. According to the relationship between the biomass (W) and tree diameter (D), tree height (H) and tree age (A) respectively and the relative growth equation and VAR model, this paper establishes the biomass estimation model of each forest organs and the total biomass model.2. The biomass of three types of forest stands is rapidly accumulated during the middle-young stage and the increases of each organ and total biomass are larger than ones during other stages. Where, the aboveground biomass is mainly in the grown and over-grown forests, which occupy73.65%,85.94%and52.07%of the total aboveground biomass. Among all types of biomass organs, the trunk occupies the most, while the leaves occupy the least; but there is the certain difference of different tree species in the distribution of each organ biomass with different ages.3. With increasing of stand age, the root biomass always increased. Of them, the increasing rate of root biomass of middle-age achieve maximum. The biomass proportion of roots with different diameter ranged as stump, middle root and fine root decreased with age increase. But the root stake and capillary root biomass were different, the proportion increase with age increase. Root biomass declined with increasing soil depth. Approximately more than88.83%root biomass distributed in0-40cm soil layer.4. Estimates of three species of biomass and carbon storage, the results can be showed as follow:the biomass of Populus alba var pyramidalis Bge young plantations is23.11t/hm2,the carbon density is11.12t/hm2, biomass of the middle-age forests is51.39t/hm2,the carbon density is26.36t/hm2,and the mature plantations is208.31t/hm2,the carbon density is101.7t/hm2; the biomass of Larix sibirica Ledeb young plantations is4.91t/hm2,the carbon density is2.19t/hm2, biomass of the middle-age forests is44.00t/hm2,the carbon density is19.67t/hm2. the near mature plantations is100.82t/hm2,the carbon density is44.99t/hm2; the mature plantations is271.21t/hm2,the carbon density is120.99t/hm2; the over mature plantations is644.54t/hm2,the carbon density is289.60t/hm2; the biomass and carbon density of Abies sibirica Ledeb young plantations are9.77t/hm2and4.42t/hm2, biomass and density of the middle-age forests is133.43t/hm2and59.84t/hm2, near mature forests are379.85t/hm2and168.59t/hm2, mature forests are568.26t/hm2and253.94t/hm2. Forest biomass, carbon density and carbon storage will increase as the young forests growing and by new management initiatives aiming to improve stand structure.