摘要
采用根钻法对以上6种森林类型细根现存量进行动态研究。对0—30cm土层的细根（≤5mm）现存生物量和死亡量的动态变化进行比较。结果表明：1）不同林分的细根现存量差别很大，6种林分中细根现存量为水曲柳林（1030．0g·m^-2）〉蒙古栎林（973．4g·m^-2）〉红松林（780．9g·m^-2）〉落叶松林（718．2g·m^-2）〉山杨林（709．1g·m^-2）〉樟子松林（470．4g·m^2）；2）除落叶松外，其他林分活细根现存量与总细根现存量变化趋势相一致。红松林、落叶松林活细根现存量最大值出现在5月，其余4种均出现在6月，水曲柳林最小值出现在9月，其他5种林分均出现在7月或8月；3）不同林分死细根所占的比率不同；4）从细根的垂直分布来看，由于温度、水分、养分等在不同土壤层中分配比率不同，细根的现存量主要集中在0—10cm土层中，在各林分中占细根总现存量的比率都超过40％，其中水曲柳林最高，达到60．3％。由此可见，不同森林类型的细根时空动态具有种的特殊性，在进行整个地区森林生态系统物质循环和能量流动研究时，应考虑不同森林类型的特性。
Maoershan forestry centre lies in Zhangguangeai Mountain of Changbai Mountain range. Main forest typos are plantation （ Pinus sylvestris var. mongolica, Pinus koraiensis and Larix gmelinii ） and natural secondary forests （ Fraxinus mandshurica, Quercus mongolica and Populus davidiana） in Maoershan region. Fine roots have enormous surface, growing and turning over quickly, playing an important role in terms of substance cycle and energy flow in forestry ecosystem. This experiment was studied on dynamics of live, dead and total fine roots （ ≤ 5 mm） biomass of 0 - 30 cm soil layer by soil core method and the differences between the six stands in Maoershan region. The results showed： 1） The fine roots biomass in different stands had obvious differences. Total fine roots biomass of six stands from high to low were F. mandshurica （ 1 030.0 g·m^-2 ） 〉 Q. mongolica （973.4 g·m^-2） 〉 p . koraiensis （ 780.9 g·m^-2 ） 〉 L . grnelinii （718.2 g·m^-2） 〉 p . davidiana （709.1 g·m^-2） 〉 p . sylvestris var. mongolica （470.4 g·m^-2 ） ; 2） Except L. gmelinii, the trend of live fine roots biomass was in accord with the trend of total fine roots biomass. The maximum biomass of live fine roots in P. koraiensis or L. gmelinii＇ stand appeared in May, others in June; In F. mandshurica stand, the minimum biomass of live fine roots appeared in September, others in July or August; 3） The proportions of dead fine roots biomass were different in different stands; 4） Fine roots vertical distribution was affected by temperature, water and nutrient, the proportion of fine roots biomass centralized in 0 - 10 cm soil layer. Fine roots biomass of six sands in 0 -10 cm soil layer was over 40% of the total fine roots biomass, the proportion of F. mandshurica was 60.3 %. Space-time dynamics of different stands had different characteristics. When researching on substance cycle and energy flow of all forest ecosystems, we should consider the characteristics of different stands in order to improve estimative precision.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2006年第6期13-19,共7页
Scientia Silvae Sinicae
基金
国家自然科学基金(30471372)资助。
关键词
帽儿山
细根
生物量
人工林
天然次生林
Maoershan
fine roots
biomass
plantation
natural secondary forest
