| Manglietia glauca was belonged to Magnoliaceae evergreen broad-leaved species, which originated in Vietnam, Indonesia and other Southeast Asian countries. As one of precious species that successfully introduced in China, Manglietia glauca had provided advantages such as rapid growth, strongly adaptability and straight stem characteristic. In this research,10-year-old Manglietia glauca was mainly researched on biomass productivities, nutrient characteristics and carbon storages at fast-growing stage. The trial site was selected in Jiepai branch, Gaofeng forest Farm. The purpose of the research was to reveal Manglietia glauca plantation’s biomass productivities, nutrient and carbon accumulation characteristics and to provide a scientific basis for Manglietia glauca’s management in the future. The main results were as follows:(1) The average biomass of10-year-old Manglietia glauca was65.506kg/tree. The production in forest stand was93.544t/hm2. The proportion of trunk, bark, live branch, dead branch, leaf and root biomass were respectively58.7%,7.64%,8.59%,5.29%,4.74%,15.04%. The litter layer biomass was8.913t/hm2, including56.6%of leaves and43.4%of branches.(2) In10-year-old Manglietia glauca plantatin, forest stand annual net productivity was9.354t/(hm2·a). Different organs have different accumulation rates, stem occupied the most quickly accumulation speed (5.491t/hm-2·a-1); the following were root and branch, which respectively1.407t/(hm2·a) and1.299t/(hm2·a); the most slowly organs were leaf and bark, which respectively0.443t/(hm2·a) and0.715t/(hm2·a). (3) There were10nutrient elements in each organ which tested, they were N, P, K, Ca, Mg, Fe, Mn, Cu, Zn and B. Each organ’s nutrient elements content order roughly:leaf> bark> branch> root> trunk. Among major elements, N contained the highest content, the following was Ca or K, and the lowest content was P or Mg. Among trace elements, the highest content was Mn or Fe, the following was B or Zn, Cu got the lowest.(4) Total nutrient accumulation of forest stand was1000.49kg/hm2, including85.9%of tree layer (859.5kg/hm2) and14.09%of litter layer (141.01kg/hm2). The annual net nutrient accumulation of tree layer is85.95kg/(hm2.a), different organ’s annual net accumulation order roughly:stem> leaf> bark> root> branch. To produce1ton dry-matter, Manglietia glauca would need8.94kg of5major elements (N, P, K, Ca and Mg)(5) Compared to first-rotation stand,10-year-old Manglietia glauca plantation’s soil organic carbon and whole nitrogen increase5.76%～36.61%and5.36%～18.63%respectively. Valid-N content increase17.33%to22.15%. Soil total phosphorus and valid-P contents were also effective present the increasing trend.(6) Total carbon storage of Manglietia glauca plantation ecosystem was138.482t/hm2, which contained35.41%of tree layer’s carbon storage (49.036t/hm2). Different organ’s carbon storage’s order was stem>root>branch>bark>leaf. Also it contained3.17%of litter layer’s carbon storage (4.395t/hm2) and61.42%of soil layer’s carbon storage (85.05t/hm2).(7) Annual carbon net fixation of Manglietia glauca plantation was8.130t/hm2, including60.32%of tree layer’s annual carbon net fixation (4.904t/hm-2·a-1) and39.68%of litter layer’s annual carbon net fixation (3.226t/hm·a-1).10-year-old Manglietia glauca plantation could absorb19.592t/hm-2·a-1of CO2, in which tree layer could absorb17.98t/hm2and litter layer could absorb11.83t/hm2.It showed that, Manglietia glauca was a precious specie that could grow fast, contain high productivity and carbon sinks, also it could improve soil fertility. Reasonable operate and develop Manglietia glauca plantation could enhance carbon sink function, maintain and improve soil fertility, improve forest productivity. It can achieve the combining of Manglietia glauca’s utilization and preservation. Preservation promotes preservation. It can ensure the sustainable preservation and efficient utilization of Manglietia glauca. |
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