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首页> 外文期刊>Journal of Tropical Forest Science >Quantifying biomass of secondary forest after slash-and-burn cultivation in Central Menabe, Madagascar.
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Quantifying biomass of secondary forest after slash-and-burn cultivation in Central Menabe, Madagascar.

机译：在马达加斯加中部梅纳贝中进行刀耕火种后的次生林生物量定量分析。

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Biomass is the principal input of nutrients in slash-and-burn cultivation of tropical dry deciduous forest. In this paper, we report the aboveground biomass of ligneous and herbaceous vegetation as a function of the age of abandonment after cultivation in order to analyse the potential amount of nutrients released into the soil. To estimate the biomass of trees, we used dendrometric classes based on height and circumference at breast height of all individual plants inventoried in the plots in four growth types. For biomass measures, we harvested representative trees in each defined class. The quantity of total biomass increased with age of abandonment, reaching 72 t ha-1 after 40 years of abandonment. The species that contributed most to biomass were Fernandoa madagascariensis, Diospyros perrieri, Dalbergia sp., Poupartia silvatica, Tarenna sericea, Xeromphis sp., Phylloctenium decaryanum, Stereospermum euphorioides and Croton greveanum. Diospyros increased regularly already after 10 years of abandonment. The biomass of Dalbergia also increased with the age of abandonment, but after 30 years, this quantity decreased because of selective harvest by farmers. Fernandoa increased after 30 years, as did Poupartia, but the latter became a key player as it was, comparatively, the species with the highest biomass shortly after 30 years of abandonment.
机译：生物质是热带干燥落叶林的刀耕火种过程中养分的主要输入。在本文中，我们报告了木质和草本植被地上生物量与耕种后放弃年龄的函数关系，以分析释放到土壤中的潜在养分量。为了估算树木的生物量，我们根据地势上四种高度类型的所有个体植物的身高和胸高的周长使用了树状图。对于生物量测度，我们在每个定义的类别中收获有代表性的树木。随着废弃年龄的增长，总生物量增加，废弃40年后达到72 t ha -1 。对生物量贡献最大的物种是马达加斯加蕨（Fernandoa madagascariensis），柿属（Diospyros perrieri），黄檀属（Dalbergia sp。），细木灰柏（Poupartia silvatica），塔伦纳（Tarenna sericea），干ero属Xeromphis sp。在被遗弃10年后，薯os已定期增加。黄檀的生物量也随着废弃年龄的增长而增加，但30年后，由于农民的选择性收获，该数量减少了。 30年后，费尔南多亚（Fernandoa）和Poupartia一样增加了，但后者却成为了主要参与者，因为相对而言，弃掉30年后不久，其生物量最高。

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