Effects of nutrient addition on polyphenol and nutrient concentrations in leaves of woody species of a savanna woodland in Central Brazil

被引:0
作者
Baiocchi Jacobson, Tamiel Khan [1 ]
da Cunha Bustamante, Mercedes Maria [2 ]
机构
[1] Univ Brasilia, Fac UnB Planaltina, BR-73300000 Planaltina, DF, Brazil
[2] Univ Brasilia, Dept Ecol, BR-70919970 Brasilia, DF, Brazil
关键词
Biogeochemistry; Brazilian savanna; eutrophication; fertilization; leaf age; nutrient limitation; plant functional types; secondary compounds; sulphur; tannin; QUALEA-PARVIFLORA VOCHYSIACEAE; PROTEIN PRECIPITATION; LITTER; PLANTS; DECOMPOSITION; DIVERSITY; HERBIVORY; RESPONSES; ECOSYSTEM; AREAS;
D O I
10.1017/S0266467419000257
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
We investigated whether changes in nutrient availability affected N, P, S and polyphenol concentrations in different leaf-development stages of three brevideciduous and three evergreen dominant woody species in a nutrient-limited savanna woodland in Central Brazil. Treatments included eight years of annual fertilization with 100 kg ha(-1) of N, P, N plus P and control, each replicated in four randomized 15 x 15-m plots. All species increased S concentrations (minimum 28%) in young and mature leaves in fertilized plots. Dalbergia miscolobium decreased total phenol concentrations with P (-34.3%, -23.7%) and NP fertilization (-28.2%, -17.1%). Blepharocalyx salicifolius increased total phenol (27.6%, 18.8%) and tannin (46.3%; 43.5%) in P fertilized and increased total phenol (33.9%) and tannin (27.8%, 43.5%) in NP fertilized plots. Total phenol concentration decreased with leaf age in Ouratea hexasperma, Styrax ferrugineus and Blepharocalyx salicifolius, which also decreased tannin concentration with leaf age. For all treatments, brevideciduous species had higher N, P, total phenols and tannin concentrations and lower S concentration than evergreens. These differences between phenological groups suggest that tropical ecosystems responses to environmental changes are more complex than anticipated by global vegetation models, with consequences for predictions in ecosystem functions and resilience.
引用
收藏
页码:288 / 296
页数:9
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