Soil phosphorus fractionation and phosphorus-use efficiency of a Bornean tropical montane rain forest during soil aging with podozolization
Soil phosphorus fractionation and phosphorus-use efficiency of a Bornean tropical montane rain forest during soil aging with podozolization
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DOI：
10.1007/s10021-003-0229-6
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发表时间：
2004-04-01
期刊：
影响因子：
3.7
通讯作者：
Wagai, R
中科院分区：
文献类型：
--
作者：
Kitayama, K;Aiba, SI;Wagai, R
我们比较了两个山地热带雨林（婆罗洲京那巴鲁山）的磷 (P) 动态和植物生产力，这两个雨林源自相似的母质（主要是沉积岩），气候相似，但土壤年龄不同。较新的遗址起源于第四纪崩积物沉积物，而较古老的遗址则具有第三纪物质。老遗址具有独特的地平线、不稳定无机土壤磷水平降低、顽固性有机土壤磷浓度较高以及土壤净氮矿化率较低。施磷导致缺磷土壤中的土壤氮（N）固定，表明土壤氮矿化在缺磷的老地点受到磷的限制。两个地点的所有元素的平均叶面养分浓度（以重量和面积为基础）相似，但磷除外，旧地点的磷含量较低。老地点的地上净初级生产力（ANPP）低于新地点；这种差异可以通过旧地点 P 和 N 的可用性降低（如 P 下调）来解释。尽管在缺磷的旧位点的可用性降低，但相对充足的磷和氮分配到叶子，归因于其高吸收效率。高吸收导致落叶层中元素浓度较低，即可分解的低质量凋落物较少。另一方面，老地点的落叶木质素浓度要低得多。这似乎是一种事实上的适应性机制，以避免阻碍垃圾分解。
We compared phosphorus (P) dynamics and plant productivity in two montane tropical rain forests (Mount Kinabalu, Borneo) that derived from similar parent materials (largely sedimentary rocks) and had similar climates but differed in terms of soil age. The younger site originated from Quaternary colluvial deposits, whereas the older site had Tertiary-age material. The older site had a distinctive spodic horizon, reduced levels of labile inorganic soil P, higher concentrations of recalcitrant organic soil P, and lower rates of net soil N mineralization. P fertilization led to soil nitrogen (N) immobilization in the P-deficient soil, indicating that soil N mineralization was limited by P at the P-deficient older site. Mean foliar nutrient concentration (on both a weight and an area basis) was similar at the two sites for all elements except P, which was lower at the older site. Aboveground net primary production (ANPP) was lower at the older site than at the younger one; this difference could be explained by the reduced availability of P and N (as down-regulated by P) at the older site. The relatively ample allocation of P and N to leaves, despite the reduced availability at the P-deficient old site, was attributable to its high resorption efficiency. High resorption resulted in lower concentrations of elements in leaf litter-that is, less decomposable low-quality litter. On the other hand, the concentration of leaf litter lignin was considerably lower at the older site; this appeared to be a de facto adaptive mechanism to avoid retarding litter decomposition.