不同林龄木麻黄人工林细根能量现存量动态

Dynamics of standing crop of energy for fine roots of Casuarina equisetifoliaplantations

对福建省惠安县赤湖林场不同林龄木麻黄人工林细根能量现存量的季节动态进行了系统研究.结果表明:各林龄木麻黄人工林活细根和死细根中的灰分现存量和死细根中的能量现存量在3月和7月有两个峰值,而活细根中的能量现存量峰值则出现在秋冬季节和7月份;活细根中的灰分和能量现存量随林龄的增加先升高后下降,但峰值出现的时间不同,灰分出现在24林龄中,而能量则出现在30林龄中,死细根中的灰分和能量现存量随林龄的增加而升高.因此,木麻黄人工林细根能量的固定随着季节和林分林龄的变化而发生相应的变化.

Seasonal dynamics of standing crop of energy for fine roots of Casuarina equisetifolia plantations of different ages was studied at Chihu forestry center of Hui ＇ an county,Fujian Province.The results showed that the high levels of standing crop of ash both occurred in March and July for living and dead fine roots for different aged C.equisetifolia plantations;while the standing crop of energy was the relatively highest in March and July for dead fine roots,and that was in January,July and November for living fine roots.The standing crop of ash and energy in living fine roots increased and then decreased with forest age.But the standing crop of ash reached the highest in 24-year-old and the standing crop of energy in 30-year-old plantation.the standing crop of ash and energy in dead fine roots both increased with forest age.So season and forest age would be responsible for the energy fixation.