Seasonal dynamics of arbuscular mycorrhizal fungi in plants of Theobroma grandiflorum Schum and Paullinia cupana Mart. of an agroforestry system in Central Amazonia, Amazonas State, Brazil
Seasonal dynamics of arbuscular mycorrhizal fungi in plants of Theobroma grandiflorum Schum and Paullinia cupana Mart. of an agroforestry system in Central Amazonia, Amazonas State, Brazil
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DOI：
10.1590/s1517-83822005000300011
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发表时间：
2005-09
影响因子：
2.2
通讯作者：
Arlem Nascimento de Oliveira;L. D. Oliveira
中科院分区：
文献类型：
--
作者：
Arlem Nascimento de Oliveira;L. D. Oliveira
研究了亚马逊河流域中部陆地生态系统中两种果树根际丛枝菌根真菌（AMF）的季节动态。采用完全随机设计研究了两种寄主（Theobroma grandiflorum和Paullinia cupana）和9个采样月（1998年8月、9月和12月，1999年2月、4月、5月和12月，2000年2月和5月），重复5次，采用2 × 9析因实验。1998年8月至2000年5月期间采集了土壤（0-20厘米深）和根系样本。AMF的平均定殖率在2000年2月和5月（雨季）达到最大值。1999年4月和5月，2000年2月和5月（雨季）AMF孢子数量最高。降雨量与两种果树的AMF孢子数均呈显著正相关，仅与杯果的AMF定殖率呈显著正相关。土壤含水量与AMF的定殖率和孢子数呈正相关。T. AMF定殖和AMF孢子数量。土壤Mg、K含量与桔梗生长量呈显著正相关。AMF孢子数在T.洋桔梗的有效阳离子交换量（ECEC）也呈负相关。根际AM真菌定殖率和AM真菌孢子数量与pH和Mn浓度呈正相关。AMF定殖也呈正相关，AMF孢子数量为两个物种的评价。总之，这项研究表明，AMF殖民和孢子形成是季节性的，并依赖于宿主植物物种，降雨量，土壤水分含量和土壤化学在亚马逊河流域中部的条件。
The seasonal dynamics of Arbuscular Mycorrhizal Fungi (AMF) was investigated in the rhizosphere of two fruit species in a terra firme (upland) ecosystem in Central Amazonia. Two host species (Theobroma grandiflorum and Paullinia cupana) and nine sampling months (August, September and December/1998, February, April, May and December/1999, February and May/2000) were studied in a completely randomized design, with five replications, set in a 2 x 9 factorial experiment. Soil (0-20 cm depth) and root samples were collected between August 1998 and May 2000. The mean percent colonization of AMF for both species reached maximal values in February and May 2000 (rainy season). In April and May 1999, February and May 2000 (rainy season) the highest AMF spore numbers were registered. The pluvial precipitation was significantly positively correlated with AMF number spores for both fruit species, and significant positive correlation only with AMF colonization of P. cupana. Soil moisture content was positively correlated with colonization and spore numbers of AMF for both species evaluated. AMF colonization and AMF spore numbers of T. grandiflorum were positively correlated with soil Mg and K concentrations. AMF spore numbers of T. grandiflorum were also negatively correlated with effective cation exchange capacity (ECEC). AMF colonization and AMF spore numbers in the rhizosphere of P. cupana were positively correlated with pH and Mn concentrations. AMF colonization was also positively correlated with AMF spore numbers for both species evaluated. In conclusion, this study showed that AMF colonization and sporulation are seasonal and dependent on host plant species, pluvial precipitation, soil moisture content and soil chemistry in Central Amazonia conditions.