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Citation:

Stoichiometric Characteristics of Nitrogen and Phosphorus in Dicranopreris dichotoma During Ecosystem Restoration of Eroded Red-Soil

  • Received Date: 2015-12-25
  • [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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Stoichiometric Characteristics of Nitrogen and Phosphorus in Dicranopreris dichotoma During Ecosystem Restoration of Eroded Red-Soil

  • 1. State Key Laboratory for Subtropical Mountain Ecology, Fujian Normal University, Fuzhou 350007, Fujian, China
  • 2. Institute of Geography, Fujian Normal University, Fuzhou 350007, Fujian, China

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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