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Effect of nitrogen and phosphorus fertilization on leaf N and P stoichiometriccharacteristics of Machilus pauhoi seedlings*(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2016 02
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Effect of nitrogen and phosphorus fertilization on leaf N and P stoichiometriccharacteristics of Machilus pauhoi seedlings*
LI Man1 2 JIN Bingjie1 2 ZHONG Quanlin1 2 3 MA Yuzhu1 2 LU Hongdian1 2 GUO Bingqiao1 2ZHENG Yuan1 2 & CHENG Dongliang1 2 3**
1College of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China2State Key Laboratory Breeding Base of Humid Subtropical Mountain Ecology, Fuzhou 350007, China3Fujian Provincial Key Laboratory of Plant Ecophysiology (Fujian Normal Unive
Machilus pauhoi seedlings fertilization ecological stoichiometry leaf nutrients soil nutrients N:P

For a comprehensive understanding of the nutrient conservation mechanism of Machilus pauhoi in the subtropicalzone, we need to know the response of leaf nutrient contents to fertilizers. This paper aimed to study the effect of nitrogen andphosphorus fertilization on leaf N and P stoichiometric characteristics of M. pauhoi seedlings. A microcosm experiment withN and P fertilization was designed to observe the dynamic change of leaf N, P content and their correlation with soil nutrients.The treatments included 5 levels of N addition of 0, 2, 4, 8, 16 times of initial soil, respectively, as control (CK), N1, N2, N3,and N4; P addition of the same gradients as CK, P1, P2, P3, and P4; we did three replicates for each treatment. The resultshowed a range of 14.63-14.63 mg/g for leaf N, 0.64-1.84 mg/g for P content and 10.04-23.21 for the N:P ratio of M. pauhoiseedlings. By N fertilization, a low–high–low pattern was observed in the leaf N content and N:P ratio, but an opposite patternin the leaf P content; by P fertilization, the leaf P content first decreased then increased with the season. N or P fertilizationsignificantly increased the leaf and soil N or P content respectively, and both significantly affected the soil pH (P < 0.05), theleaf N,P content and soil nutrient relationship. N addition improved the stoichiometric ratio, while P addition reduced it (P < 0.05).The results indicated that the N and P content in soil would affect the leaf N and P content of Machilus pauhoi seedings.


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