| Pinus koraiensis is top communication species in eastern part of Northeast forest, but the quantities decreased for many years. Korean pine plantation was cultivated after our country rebuilt, and a part of them have been mixed with natural invaded vegetations,which formed as natural mixed forest. For better understanding of Korean pine planation in carbon storage, pinus koaiensis with 20 and 42 years, Betula platyphlla-pine mixed forest, Quercus mongolica-pine mixed forest were selected in Lao Shan experiment station of Northeast Forestry University. Methods of diameter-class standard tree and plot harvest were used to measure the biomass of leaves,branches, woods,fruits and roots, as well as carbon storage. Soil respiration and soil respiration, litter carbon storage and decomposition rate were measured, and thus carbon input and output of these studied ecosystems were calculated, results showed that:1) Total carbon storage of Korean pine plantation with 20 years was 134.10Mg·hm-2, of which biomass carbon storage accounted 20.82%, soil carbon storage 78.75%, litter carbon storage 0.43%. For 42 years Korean pine planation, total carbon storage was 323.34Mg·hm-2, of which biomass carbon storage accounted 25.95%, soil carbon storage 73.5%, litter carbon storage 0.55%. Total carbon storage of Betula platyphlla-pine mixed forest with 20 years was 141.39Mg·hm-2, of which biomass carbon storage accounted 19.91%, soil carbon storage 79.60%,, litter carbon storage 0.49%. For 42 years Betula platyphlla-pine mixed forest, total carbon storage was 351.12Mg·hm-2, of which biomass carbon storage accounted 24.93%, soil carbon storage 74.31%, litter carbon storage 0.76%. Total carbon storage of Quercus mongolica-pine mixed forest with 20 years was 193.23 Mg·hm-2, of which biomass carbon storage accounted 17.95%, soil carbon storage 81.69%,, litter carbon storage 0.36%. For 42 years Quercus mongolica-pine mixed forest, total carbon storage was 377.23Mg·hm-2, of which biomass carbon storage accounted 25.42%, soil carbon storage 73.87%, litter carbon storage 0.71%. Compared thses three kinds of forest carbon storage, carbon storage in mongolica-pine mixed forest was highest, then in betula platyphlla-pine mixed forest, korean pine planation the lowest. Compared carbon storage in soil, biomass and litterfall in these three pine mixed ecosystems, soil carbon storage>biomass carbon storage)litterfall carbon storage.2) Soil carbon storage was accounted for large part of total carbon storage in pine forest, with 73.5%-74.31% for 42 years pine forest, and 20 years planation accounted more. Layer L(not decomposed layer) accounted for 4.29%, layer F(half-decomposed layer) 5.56%, layer H(humus layer) 13.96%, layer B(mineral layer) 76.19%. Soil carbon content increased with soil depth, and had an exponential relationship with its depth. Soil carbon sotrage had a closely relationship with soil density, soil depth and soil carbon content.3) Litterfall carbon storage was composed of litter leaves, branches and fruits, etc. Leave carbon storage accounted for 36.65%, branch 27.31%, fruit 22.64%, etc.Carbon decomposition rate was different for its forest types, carbon releasion rate in pure pine planation was 43.33%, for first year about 24.25%, the second 19.08%. Weight losing rate in betula platyphlla-pine mixed forest was 50.19%, for 30.72% the first year,19.47% the second. Weight losing rate in mongolica-pine mixed forest was 52.83%, for 32.49% the first year,20.41% the second. Compared thses three kinds of forest carbon release rate, mongolica-pine mixed forest was the highest, then in betula platyphlla-pine mixed forest, koreain pine planation the lowest.4) Soil respiration rate was 3.44μmol·m-2·s-1in koreain pine planation,4.00μmol·m-2·s-1 in betula platyphlla-pine mixed forest,4.13μmol·m-2·s-1 in mongolica-pine mixed forest. Soil respiration in mongolica-pine mixed forest was highest, then in betula platyphlla-pine mixed forest, pine planation the lowest. Soil repiration changed with seasonal trends. The highest value of soil respiration occurred in august for the first year, and june and august for the second. The lowest soil respiration occurred in the beginning of the growing season and october. Soil respiration in the three forest types was related with air temperature, soil temperature, and soil water content, which clearly explained that environmental factors effected, soil respiration rate.5) Differences between the biomass carbon storage and soil respiration in these three pine planation was new add carbon storage. New carbon storage was 1.30Mg·hm-2·a-1 for pure pine forest,1.54Mg·hm-2·a-1 for betula platyphlla-pine mixed forest,1.89Mg·hm-2·a-1 for mongolica-pine mixed forest. Compared to other published results, new add carbon storage in our study was a little lower, which maybe ascribed to low age reason. |
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