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首页> 外文期刊>Plant and Soil >Allocation of carbon in a mature eucalypt forest and some effects of soil phosphorus availability.
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Allocation of carbon in a mature eucalypt forest and some effects of soil phosphorus availability.

机译：成熟桉树森林中碳的分配以及土壤磷有效性的一些影响。

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Pools and annual fluxes of carbon (C) were estimated for a mature Eucalyptus pauciflora forest near Canberra, with and without phosphorus (P) fertilizer addition to determine the effects of soil P availability on the allocation of C in the stand. Aboveground biomass was estimated from allometric equations relating stem and branch diameters of individual trees to their biomass. Biomass production was calculated from annual increments in tree diameters and measurements of litter fall. Maintenance andconstruction respiration were calculated for each component using equations given by Ryan [Tree Physiology (1991) 9, 255-266]. Total belowground C flux was estimated from measurements of annual soil CO2 efflux less the C content of annual litter fall (assuming forest floor and soil C were at approximately steady state for the year that soil CO2 efflux was measured). The total C content of the standing biomass of the unfertilized stand was 138 t/ha, with ?0% aboveground and 20% belowground. Forest floor C was 8.5 t/ha. Soil C content (0-1 m) was 369 t/ha, representing 70% of the total C pool in the ecosystem. Total gross annual C flux aboveground (biomass increment + litter fall + respiration) was 11.9 t/ha and gross flux belowground (coarse root increment + fine root production + root respiration) was 5.1 t/ha. Total annual soil efflux was 7.1 t/ha, of which 2.5 t/ha (35%) was contributed by litter decomposition. The short-term effect of changing the availability of P compared with C on allocation to aboveground versus belowground processes was estimated by comparing fertilized and unfertilized stands during the year after treatment. In the P-fertilized stand annual wood biomass increment increased by 30%, no evidence of changes in canopy biomass were observed, and belowground C allocation decreased by 19% in relation to the unfertilized stand. Total annual C flux was 16.97 and 16.75 t/ha year-1 and the ratio of below- to aboveground C allocation was 0.43 and 0.35 in the unfertilized and P-fertilized stands, respectively. It is suggested that the major response of the forest stand to increased soil P availability was a shift in C allocation, with little change in total productivity. It is suggested that both growth rate and allocation need to beestimated to predict changes in fluxes and storage of C in forests that may occur in response to disturbance or climatic change.
机译：估算了堪培拉附近一个成熟的桉树森林的碳汇和年通量（C），添加和不添加磷（P）肥料，以确定土壤磷的有效利用对林分中碳分配的影响。地上生物量是根据各个树的茎和枝直径与其生物量相关的异速方程估算的。根据树木直径的年度增量和凋落物的测量值计算生物量产量。使用Ryan [Tree Physiology（1991）9，255-266]给出的公式计算每个组件的维持呼吸和构造呼吸。地下总的碳通量是通过测量每年土壤CO2排放量减去每年凋落物的C含量估算出来的（假设在测量土壤CO2排放量的那一年中，森林地面和土壤C处于大致稳定状态）。未施肥林分的固定生物量的总碳含量为138 t / ha，地上0％，地下20％。森林地面C为8.5吨/公顷。土壤碳含量（0-1 m）为369 t / ha，占生态系统总碳库的70％。地上总年通量（生物量增加+凋落物下降+呼吸）为11.9 t / ha，地下总通量（粗根增加+细根产量+根呼吸）为5.1 t / ha。年土壤总流出量为7.1吨/公顷，其中2.5吨/公顷（35％）是由凋落物分解引起的。通过比较处理后一年中施肥和未施肥的林分，可以估算出与C相比，改变P与C的有效性对分配到地上与地下过程的短期影响。在磷肥林分中，木材生物量的年增长率增加了30％，没有观察到冠层生物量发生变化的证据，地下碳分配相对于未施肥林分下降了19％。第一年的年总碳通量为16.97和16.75吨/公顷，未施肥和施磷的林分地下和地下的碳分配比分别为0.43和0.35。有人认为，林分对增加土壤磷有效性的主要反应是碳分配的变化，总生产力变化不大。建议需要估计生长速率和分配，以预测森林的碳通量和储量变化，这些变化可能是由于干扰或气候变化而发生的。

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