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本项研究的目的在于深入了解杨树用材林的生物生产潜力及其变化规律,为制订出能发掘这一潜力的速生丰产栽培技术措施提供依据。试验采用常规方法,测定了试验林的生物量和营养元素含量。获得的结果:不同树种、不同密度和不同林龄间林分生物量及其分布有所差异;健杨、欧美杨、I69/55杨丰产林的平均净初级生产力达13.80吨/公顷年以上;建立了4种杨树的各器官生物量与胸径、树高的相对生长关系式;参试树种均以同化器官的营养元素含量较高,各器官吸收主要营养元素的量,叶>干>根>枝>皮。
The purpose of this study is to understand the biological production potential and the changing rules of poplar woodland in depth, and provide evidence for developing fast-growing and high-yielding cultivation techniques to explore this potential. The conventional methods were used to determine the biomass and nutrient content of the experimental forest. The results were as follows: The biomass and its distribution of stands differed among different tree species, different densities and different stand ages. The average net primary productivity of Poplar, Populus euphratica and Populus tomentosa I69 / 55 reached 13.80 tons / ha, The relative growth relationships of biomass, DBH and tree height of four organs of poplar were established. The content of nutrient elements in the organs of the tested species were higher, and the amount of the main nutrient elements were absorbed by the organs, leaf> stem> root > Branches> skin.