Retention of available P in acid soils of tropical and subtropical evergreen broad-leaved forests |
| |
| Authors: | Jianhui Chen Xiaoming Zou Xiaodong Yang |
| |
| Institution: | (1) Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, 650223, China;(2) Institute for Tropical Ecosystem Studies, University of Puerto Rico, PO Box 21910, San Juan, PR00931, USA |
| |
| Abstract: | Precipitation of mineral phosphate is often recognized as a factor of limiting the availability of P in acidic soils of tropical
and subtropical forests. For this paper, we studied the extractable P pools and their transformation rates in soils of a tropical
evergreen forest at Xishuangbanna and a subtropical montane wet forest at the Ailao Mountains in order to understand the biogeochemical
processes regulating P availability in acidic soils. The two forests differ in forest humus layer; it is deep in the Ailao
forest while little is present in the Xishuangbanna forest. The extractable P pools by resin and sodium-bicarbonate decreased
when soil organic carbon content was reduced. The lowest levels of extractable P pools occurred in the surface (0–10 cm) mineral
soils of the Xishuangbanna forest. However, microbial P in the mineral soil of the Xishuangbanna forest was twice that in
the Ailao forest. Potential rates of microbial P immobilization were greater than those of organic P mineralization in mineral
soils for both forests. We suggest that microbial P immobilization plays an essential role in avoiding mineral P precipitation
and retaining available P of plant in tropical acidic soils, whereas both floor mass accumulation and microbial P immobilization
function benefit retaining plant available P in subtropical montane wet forests.
Translated from Acta Ecologica Sinica, 2006, 26(7): 2,294–2,300 译自: 生态学报] |
| |
| Keywords: | P microbial immobilization P mineralization P pools |
| 本文献已被 SpringerLink 等数据库收录！ |
|
