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Growth and carbon stock change in eucalypt woodlands in northeast Australia: ecological and greenhouse sink implications

机译：澳大利亚东北部桉树林地的生长和碳储量变化：生态和温室汇的意义

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Data from 57 permanent monitoring sites are used to document the growth in woody vegetation and estimate the carbon sink in 27 M ha of eucalypt woodlands (savannas), contained within c. 60 M ha of grazed woodlands in Queensland (northeast Australia). The study sites are shown to be representative of the environment and structure of the eucalypt woodlands in the defined study area. Mean basal area increment for all live woody plants in 30 long-term sites, with an average initial basal area of 11.86 +/- 1.38 (SE) m(2) ha(-1), was 1.06 m(2) ha(-1) over a mean 14 years timeframe. The majority of the measurement period, commencing between 1982 and 1988, was characterized by below-average rainfall. The increase in live tree basal area was due primarily to growth of existing trees (3.12 m(2) ha(-1) ) rather than establishment of new plants (0.25 m(2) ha(-1) ) and was partly offset by death (2.31 m(2) ha(-1)). A simple but robust relationship between stand basal area and stand biomass of all woody species was developed for the eucalypt dominant woodlands. Analysis of above-ground carbon stocks in live and standing dead woody plants gave a mean net above-ground annual carbon increment for all 57 sites of 0.53 t C ha(-1) y(-1), similar to values estimated elsewhere in world savannas. Published root : shoot ratios were used to infer C flux in woody root systems on these sites. This results in an estimated sink in above- and below-ground biomass of 18 Mt C y(-1) over the eucalypt woodlands studied, and potentially up to 35 Mt C y(-1) if extended to all grazed woodlands in Queensland. It is suggested that introduction of livestock grazing and altered fire regimes have triggered the change in tree-grass dominance in these woodlands. Thus, change in carbon stocks in the grazed woodlands of Queensland is identified as an important component of human-induced greenhouse gas flux in Australia, equivalent in magnitude to c.25% of the most recently published (1999) total estimated national net emissions. The latter inventory takes into account emissions from land clearing, but does not include the sink identified in the present study. This sequestration also represents a small but significant contribution to the global terrestrial carbon sink.
机译：来自57个永久性监测点的数据用于记录木本植物的生长并估算c中包含的27 M ha桉树林地（稀树草原）的碳汇。昆士兰州（澳大利亚东北部）6000万公顷的放牧林地。研究地点被证明可以代表特定研究区域内桉树林地的环境和结构。 30个长期站点中所有活木本植物的平均基础面积增加为1.06 m（2）ha（-），平均初始基础面积为11.86 +/- 1.38（SE）m（2）ha（-1）。 1）平均14年。从1982年至1988年开始的大部分测量期的特点是降雨量低于平均水平。活树基础面积的增加主要是由于现有树木的生长（3.12 m（2）ha（-1））而不是新植物的建立（0.25 m（2）ha（-1）），并且部分被抵消死亡（2.31 m（2）ha（-1））。对于桉树优势林地，开发了所有木本植物的林分基础面积与林分生物量之间的简单但牢固的关系。对活的和站立的死木本植物的地上碳储量进行分析后得出，所有57个站点的地上平均净年度碳增量为0.53 t C ha（-1）y（-1），与世界其他地方的估计值相似稀树草原。已发布的根：芽比率用于推断这些部位木本根系中的碳通量。结果是，在所研究的桉树林地上，地下和地下生物量的估计下沉量为18 Mt C y（-1），如果扩展到昆士兰州的所有放牧林地，则可能高达35 Mt C y（-1）。有迹象表明，放牧牲畜和改变火势已经触发了这些林地中草木优势的变化。因此，昆士兰州放牧林地的碳储量变化被认为是人为引起的温室气体通量的重要组成部分，其数量相当于最新公布的（1999年）全国估计净排放总量的约25％。后一清单考虑了开荒产生的排放，但不包括本研究中确定的汇。固存也代表了对全球陆地碳汇的微小但重要的贡献。

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