退化红壤恢复过程中芒萁的N、P化学计量特征
Stoichiometric Characteristics of Nitrogen and Phosphorus in Dicranopreris dichotoma During Ecosystem Restoration of Eroded Red-Soil
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摘要: [目的] 探究生态恢复过程中严重退化红壤区林下芒萁的化学计量特征变化规律，为红壤水土流失区芒萁的恢复及水土保持提供科学依据。[方法] 以福建长汀严重退化红壤区芒萁群落为对象，通过对比不同治理年限的芒萁和土壤的N、P含量及比值的关系，研究了生态系统恢复对芒萁化学计量特征的影响。[结果] 表明：（1）治理后芒萁地上新鲜器官的N、P含量显著高于未治理的（羽叶N 8.11 g·kg-1、P 0.297 g·kg-1；叶柄N 2.63 g·kg-1、P 0.103 g·kg-1），但次生林下的芒萁的N、P含量仍高于各样地（羽叶N 12.41 g·kg-1、P 0.497 g·kg-1；叶柄N 4.32 g·kg-1、P 0.211 g·kg-1；枯羽叶N 11.09 g·kg-1、P 0.356 g·kg-1；枯叶柄N 3.83 g·kg-1、P 0.163 g·kg-1；根茎N 5.330 g·kg-1、P 0.348 g·kg-1）；与未治理的对照相比，芒萁干枯器官的N：P比呈现递减的趋势。（2）随着土壤养分的增加，芒萁地上和地下器官的N和P含量亦协同增加，并与土壤N：P存在显著的相关关系；在所有群落中，芒萁新鲜羽叶的N：P>16。（3）芒萁羽叶N、P和N：P比的内稳性指数均高于马尾松叶的内稳性指数，芒萁各器官对N、P元素具有较高的内稳性，与马尾松相比芒萁的养分含量更能反映土壤的养分状况。（4）芒萁枯羽叶与枯叶柄N、P含量与土壤N、P含量有显著的正相关（p[结论] 在生态恢复过程中芒萁地上与地下器官N、P含量协同增加并与土壤N：P存在显著的相关关系；在退化红壤区芒萁种群受到P的限制作用强于N的限制；干枯的芒萁器官可能是比新鲜的芒萁器官更好的土壤养分指示器。Abstract: [Objective] Taking the Dicranopreris dichotoma populations after ecological restoration of eroded red-soil as the object, a comparative study was made on the D. dichotoma and soil N, P contents and the ratios in different recovery period, aiming at understanding the change of ecological restoration on D. dichotoma stoichiometric characteristics.[Method] The D. dichotoma individuals in different restoration period from 0 to 100 years in erode red-soil were collected in Changting, Fujian Province. The N content, P content and N:P ratio in leaves and soil were measured and analyzed by correlation analysis. [Result] The results showed that the N and P contents in belowground fresh organs of D. dichotoma in restoration area were significantly higher than that in contrast area (Leaf N 8.11 g·kg-1, P 0.297 g·kg-1; Petiole N 2.63 g·kg-1, P 0.103 g·kg-1), but still lower than that in secondary forest (Leaf N 12.41 g·kg-1, P 0.497 g·kg-1; petiole N 4.32 g·kg-1, P 0.211 g·kg-1; dead leaf N 11.09 g·kg-1, P 0.356 g·kg-1; dead petiole N 3.83 g·kg-1, P 0.163 g·kg-1;rhizome N 5.330 g·kg-1, P 0.348 g·kg-1). Compared with the contrast area, the N:P ratio of dead organs showed a trend of decline. With the increasing of soil nutrient, the N, P contents in the aboveground and belowground organs increased simultaneously and also had a significant correlation with soil N:P ratio. In all community, the N:P ratio of D. dichotoma leaves were lower than 16. Homeostasis index (H) for N, P content in the organs of D. dichotoma was higher than Pinus massoniana. Compared with P. massoniana, the nutrient contents of D. dichotoma can better reflect the status of soil nutrients. The N, P contents in dead leaf and dead petiole were positively correlated with soil N and P, respectively. It was indicated that there was a better correlation between nutrients in dead organs and soil nutrients. [Conclusion] With the increasing of soil nutrient, the N, P contents of aboveground and belowground organ increased simultaneously and also had a significant correlation with soil N:P ratio. The D. dichotoma on eroded red-soil was more strongly limited by P concentrations than N concentration. The dead plant organs may be a better indicator of soil nutrients than fresh plant organs.
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Key words:
- Dicranopreris dichotoma
- / ecological stoichiometry
- / N:P ratio
- / ecosystem restoration.
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