Nitrogen Addition Shapes Soil Phosphorus Availability in Two Reforested Tropical Forests in Southern China |
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台 站：鼎湖山森林生态系统定位研究站 |
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点 击 率：420284 |
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关 键 字(英文)：land-use history; litter decomposition; nitrogen addition; nitrogen deposition; phosphorus availability; phosphorus release; reforested forest; tropical forests. |
| 摘 要(英文)：Scant information is available on how soil phosphorus (P)availability responds to atmospheric nitrogen (N) deposition, especially in the tropical zones. This study examined the effect of N addition on soil P availability, and compared this effect between forest sites of contrasting land-use history. Effects of N addition on soil properties, litterfall production, P release from decomposing litter, and soil P availability were studied in a disturbed (reforested pine forest with previous understory vegetation and litter harvesting) and a rehabilitated
(reforested mixed pine/broadleaf forest with no understory vegetation and litter harvesting) tropical forest in southern China.
Experimental N-treatments (above ambient) were the following: Control (no N addition), N50 (50 kg N ha1 yr1), and N100
(100 kg N ha1 yr1). Results indicated that N addition significantly decreased soil P availability in the disturbed forest. In the rehabilitated forest, however, soil P availability was significantly increased by N addition. Decreases in soil P availability may be correlated with decreases in rates of P release from decomposing litter in the N-treated plots, whereas the increase in soil P availability was correlated with an increase in litterfall production. Our results suggest that response of soil P availability to N deposition in the reforested tropical forests in southern China may vary greatly with temporal changes in tree species composition and soil nutrient status, caused by different land-use practices. |
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 鲁显凯-2012-Biotropica-Nitrogen addition shapes soil phosphorus availability in two reforested tropical forests in Southern China.pdf |
