马占相思(Acacia mangium)的生长、固氮及叶状柄的营养成分

PLANT GROWTH, NODULE NITROGENASE ACTIVITY AND PHYLLODE NUTRIENT CONTENT IN ACACIA MANGIUM

摘要:

马占相思(Acacia mangium)在厦门地区生长良好,生长速度和地上部生物量均大于肯氏相思(A.cunninghamia)和大叶相思(A.auriculaeformis)。4年生的马占相思和大叶相思人工林年凋落物的干重分别为1 150 g m^-2和668 g m^-2。马占相思和肯氏相思根瘤的固氮酶活性均有明显的季节变化,8月份＞10月份＞5月份＞2月份。马占相思叶状柄营养丰富,含有较高的蛋白质和氨基酸,特别是必需氨基酸苏氨酸、缬氨酸、苯丙氨酸、酪氨酸、异亮氨酸等,而且还含有尿囊素。马占相思不仅可作为纸浆材,胶合板材、建筑和家具用材,以及水土保持林,而且是饲料、食用菌培养基和提取尿囊素的资源,有广阔的开发利用前景。

关键词:马占相思; 生长; 固氮酶活性; 营养成分

Abstract:

Acacia mangium trees planted in 1993 in Xiamen region, Fujian, showed that the growth rate and aboveground biomass were higher than those of A. cunninghamia and A. auriculaeformis. The annual litter-fall of 4-year-old trees of A. mangium and A. auriculaeformis were 1 150 g m^-2 and 668 g m^-2, respectively. Seasonal variation of nitrogenase activity in nodules of A. mangium and A. cunninghamia was obvious and was in the order August>October>May>February. The phyllodes of A. mangium were found to contain

Key words:A. mangium; Growth; Nitrogenase activity; Nutrient content