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首页> 外文期刊>Journal of Tropical Forest Science >Effects of logging on phosphorus pools in a tropical rainforest of Borneo.
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Effects of logging on phosphorus pools in a tropical rainforest of Borneo.

机译：伐木对婆罗洲热带雨林中磷库的影响。

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摘要

We quantified the amount of various phosphorus (P) fractions in a tropical lowland rainforest of Borneo and estimated the potential effects of selective logging on the P availability during the following regrowth period through the export of P as timber. Ecosystem pools of P (sum of aboveground vegetation, standing litter, roots and soils to 1 m deep) and of simultaneously quantified nitrogen (N) and carbon (C) were 3.4, 11.5 and 365 Mg ha-1 respectively. Only 2.6% of the total ecosystem P was in the aboveground vegetation, unlike C (61%) and N (16%). Soil P largely consisted of recalcitrant occluded fractions (78-91%) and only 4% was labile (bicarbonate-extractable). The concentration of labile organic P, acid phosphatase activity and fine root biomass were greatest in the topsoil (top 5 cm) and decreased with depth, suggesting that the supply of P to plants took place mainly in the topsoil. The amount of total P which was exported out as timber from the ecosystem by heavy selective logging was estimated at 24.0 kg ha-1, while the amount of labile P in the topsoil was 12.8 kg ha-1, indicating that the labile P might become deficient by more than 12 kg ha-1 for biomass recovery. Our results imply that excessive logging can induce P-limitation of post-logging biomass recovery.
机译：我们对婆罗洲热带低地雨林中各种磷（P）的含量进行了定量，并估计了在随后的再生期内通过将P出口为木材，选择性伐木对P可用性的潜在影响。 P的生态系统库（地上植被，立枝凋落物，根和土壤的总和至1 m深）以及同时量化的氮（N）和碳（C）分别为3.4、11.5和365 Mg ha -1 分别。与C（61％）和N（16％）不同，总生态系统P中只有2.6％位于地上植被中。土壤P主要由顽固的阻塞部分（78-91％）组成，只有4％不稳定（可从碳酸氢盐中提取）。表层土壤（顶部5 cm）中不稳定的有机磷浓度，酸性磷酸酶活性和细根生物量浓度最大，且随深度的增加而降低，这表明植物对磷的供应主要发生在表层土壤中。通过重度选择性伐木从生态系统出口为木材的总磷含量估计为24.0 kg ha -1 ，而表层土壤中不稳定的P含量为12.8 kg ha -1 ，表明不稳定的P可能不足12 kg ha -1 用于生物量的回收。我们的结果表明，过度采伐会导致采伐后生物量恢复的P限。

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