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- Title
Effects of stand density on Oligostachyum lubricum leaf carbon, nitrogen, and phosphorus stoichiometry and nutrient resorption.
- Authors
GUO Zi-wu; CHEN Shuang-lin; ANG Qing-ping; LI Ying-chun
- Abstract
Taking pure Oligostachyum lubricum forest as test object, this paper studied the matured and withered leaves carbon (C), nitrogen (N), and phosphorus (P) stoichiometry and N and P resorption patterns of 1-3 years old stands at the densities of 24600-29800 stem · hm-2 (D1), 37500-42600 stem . hm-2 ( D2 ), 46500 - 52800 stem · hm-2 ( D3 ), and 76500 - 85500 stem.hm-2 (D4). With increasing stand density, the matured leaves C, N, and P contents and withered leaves C and P contents had an overall decrease, the withered leaves N content decreased after an initial increase, and the matured leaves C content at density D4 decreased dramatically. The leaf C/ N and C/ P ratio increased with increasing stand density, whereas the leaf N/ P ratio increased first but decreased then. At stand densities D3 and D4, the leaf N and P utilization efficiencies were significantly higher than those at D1 and D2. With increasing stand density, theleaf N resorption capacity increased after an initial decrease, while the leaf P resorption capacity increased steadily. At stand densities D1 -D3, the matured leaves N/ P ratio was 16. 24-19. 37, suggesting that the P limitation occurred, leaf establishment increased, and population increase and expansion enhanced. At density D4, the matured leaves N/ P ratio was 13. 42-15. 74, implying that the N limitation strengthened, leaf withering and defoliation increased, and population increase inhibited. All the results indicated that O. lubricum could regulate its leaf C, N and P contents and stoichiometry and enhance the leaf N and P utilization efficiency and resorption capacity to adapt to the severe competition of environment resources at high stand density. In our experimental condition, 46500-52800 stem.hm-2 could be the appropriate stand density for O. lubricum management.
- Subjects
LEAVES; NITROGEN content of plants; PHOSPHORUS; CHEMICAL composition of plants; CARBON content of plants; RESORPTION (Physiology); PLANT physiology
- Publication
Yingyong Shengtai Xuebao, 2013, Vol 24, Issue 4, p893
- ISSN
1001-9332
- Publication type
Article