Production and turnover of N2 fixing nodules in relation to foliage development in periodically pruned Erythrina poeppigiana (Leguminosae) trees

摘要: Abstract Many multi-purpose leguminous trees are managed by means of periodic prunings. A study on the dynamics N 2 fixing nodules in five sources neotropical agroforestry tree species Erythrina poeppigiana (Walpers) O.F. Cook was carried out order to gain an understanding interaction between foliage development and nodulation The standing crop active senescent sampled monthly soil cores during a pruning interval 23 weeks, nodule production turnover were estimated basis changes crops decomposition rate applying compartment-flow model approach. Environmental factors remained stable period. caused complete mortality nodules, about half them decomposed within weeks. New living observed at 10 weeks after (WAP), highest 14 WAP (variation 106–288 g per tree). differences statistically significant. low before WAP, but subsequently increased connection with initiation leaf shedding. compensated new nodules. biomass ratio 0.092 – 0.269, decreased one-third this towards end because growth. Pruning residues contributed 67%, litterfall prunings 24% 9% potential supply 137–238 E. period, minor variation percentages.