Litterfall silicon flux in relation to vegetation differences in old‐growth and logged lowland forests in Borneo
Litterfall silicon flux in relation to vegetation differences in old‐growth and logged lowland forests in Borneo
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婆罗洲原始森林和低地砍伐森林中凋落物硅通量与植被差异的关系
DOI：
10.1111/1440-1703.12253
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发表时间：
2021
影响因子：
2
通讯作者：
Kitajima Kaoru
中科院分区：
文献类型：
--
作者：
Nakamura Ryosuke;Imai Nobuo;Aoyagi Ryota;Kitayama Kanehiro;Kitajima Kaoru
低地热带森林通过凋落物循环大量的硅，但很少有人知道凋落物硅通量是如何修改采伐森林。在婆罗洲的沙巴，我们比较了一个古老的森林林分和林分，已收到约20-30年前减少影响伐木（RIL）或常规伐木（CL），在硅浓度的最新落叶，硅通量通过凋落物，和水提取硅从上层土壤层。龙脑香科优势树种的枯叶硅含量在属和种之间差异很大（1.2-29.7 mg Si g-dry-mass-1）。一些先锋树（例如，Macarangaspp.）RIL林和CL林的优势竹种叶片中Si含量较高。凋落物硅通量在RIL林分（392 kg ha− 1 year −1），其中竹子是丰富的，高于CL和老林分（187和153 kg ha− 1 year −1，分别）。土壤中的水可提取硅也是RIL林分中最高的，其次是CL林分和老林分。总之，我们的研究表明，具有高枯叶硅浓度的竹子和先锋树增加了采伐后林分中的硅通量，以补偿与硅积累龙脑香科树木丰度降低相关的硅通量损失。凋落物硅通量和水提取的土壤硅之间的三个立场之间的相关性也表明硅通过植物在这个低地热带森林，收到对比类型的采伐反馈回路。
Lowland tropical forests cycle large quantities of silicon (Si) via litterfall, but little is known how litterfall Si flux is modified in logged forests. In Sabah, Borneo, we compared an old‐growth forest stand and stands that had received reduced‐impact logging (RIL) or conventional logging (CL) about 20–30 years ago, in terms of Si concentration of recently abscised dead leaves, Si flux via litterfall, and water extractable Si from upper soil horizons. The Si concentration of dead leaves produced by dominant tree species in Dipterocarpaceae differed widely among genera and species (1.2–29.7 mg Si g‐dry‐mass−1). Some pioneer trees (e.g.,Macarangaspp.) and bamboo species that dominate the RIL and CL stands exhibited high Si concentration in their dead leaves. Litterfall Si flux was higher in the RIL stand (392 kg ha−1year−1) where bamboo was abundant, than in the CL and old‐growth stands (187 and 153 kg ha−1year−1, respectively). Water extractable Si from the soil was also the highest in the RIL stand, followed by the CL and old‐growth stands. In conclusion, our study suggests that bamboos and pioneer trees with high dead‐leaf Si concentrations increase Si flux in post‐logging stands, in a manner to compensate for the loss of Si flux associated with decreased abundance of Si accumulating Dipterocarpaceae trees. The correlation between litterfall Si flux and water extractable soil Si among the three stands also suggests a feedback loop of Si via plants in this lowland tropical forest that received contrasting types of logging.