The production, allocation and cycling of carbon in a forest on fertile terra preta soil in eastern Amazonia compared with a forest on adjacent infertile soil
The production, allocation and cycling of carbon in a forest on fertile terra preta soil in eastern Amazonia compared with a forest on adjacent infertile soil
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DOI：
10.1080/17550874.2013.798367
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发表时间：
2014-01-01
影响因子：
1.5
通讯作者：
Malhi, Yadvinder
中科院分区：
文献类型：
--
作者：
Doughty, Christopher E.;Metcalfe, Daniel B.;Malhi, Yadvinder
目的：我们首次报道了在亚马孙东部(巴西帕拉帕拉卡西亚纳)的一块Terra Preta土地上的生产力、分配和碳循环的研究，并与附近贫瘠土壤上的一块土地的动态进行了对比。方法：我们测定了细根、木材和树冠的总净第一性生产量(NPP)和总的自养呼吸(根际、木材、结果：Terra Preta样地的总第一性生产力(GPP)(35.68+/-3.65比32.08+/-3.46 mg C ha(-1)年(-1))和碳利用效率(CUE)(0.44+/-0.06比0.42+/-0.05)都略高。总NPP(15.77+/-1.13 mg C ha(-1)年(-1)比13.57+/-0.60 mg C ha(-1)年(-1))和细根生产率(6.41+/-1.08比3.68+/-0.52 mg C ha(-1)年(-1))也比塔式地高。结论：与不育地相比，Terra Preta土壤上的森林固定的碳稍多，用于生长的碳分配略多，这导致了更大的总NPP，而NPP不成比例地分配给了细根。然而，由于增加的细根NPP被增加的异养土壤呼吸部分抵消，增加的根生长不太可能大幅增加Terra Preta土壤的土壤碳储量。
Background: Terra preta do indio or 'dark earth' soils formed as a result of a long-term addition of organic matter by indigenous peoples in Amazonia.Aims: Here we report on the first study of productivity, allocation and carbon cycling from a terra preta plot in eastern Amazonia (Caxiuana, Para, Brazil), and contrast its dynamics with a nearby plot on infertile soil (ferralsols).Methods: We determined total net primary production (NPP) for fine roots, wood, and canopy and total autotrophic respiration (rhizosphere, wood, and canopy respiration) from two 1-ha plots on contrasting soils.Results: Both gross primary productivity (GPP) (35.68 +/- 3.65 vs. 32.08 +/- 3.46 Mg C ha(-1) year(-1)) and carbon use efficiency (CUE) (0.44 +/- 0.06 vs. 0.42 +/- 0.05) were slightly higher at the terra preta plot. Total NPP (15.77 +/- 1.13 Mg C ha(-1) year(-1) vs. 13.57 +/- 0.60 Mg C ha(-1) year(-1)) and rates of fine root production (6.41 +/- 1.08 vs. 3.68 +/- 0.52 Mg C ha(-1) year(-1)) were also greater at the terra preta plot vs. the tower plot.Conclusions: Forests on terra preta soil fix slightly more carbon and allocate slightly more of that carbon towards growth than forests on the infertile plot, which leads to greater total NPP, which was disproportionately allocated to fine roots. However, since increased fine root NPP was partially offset by increased heterotrophic soil respiration, the increased root growth was unlikely to greatly enhance soil carbon stocks in terra preta soils.