关帝山亚高山华北落叶松林下植被根系生物量的时空变化

通过对关帝山亚高山华北落叶松人工纯林林下植被根系生物量、空间分布、季节动态的研究,结果表明,亚高山华北落叶松林下灌丛草本植物群落根系生物量全年平均值为127.16 g/m2,变化范围94.79～215.57 g/m2,季节动态变化显著(P＜0.05);林下植被根系生物量在0～10 cm土层分布最大,占植被根系总生物量的65%,之后随土层深度的增加,草本根系生物量迅速减少,10～20和20～30 cm分别占根系总生物量的25%和10%;在0～10、10～20和20～30 cm不同土层中根系生物量的季节变化差异显著(P＜0.05).林下植被根系生物量的水平变化为距离树干20和100cm处根系分布较多,而50 cm处根系分布较少.本研究旨在深入了解华北落叶松林潜在的地下生态学过程,以及地下生产力特征,研究结果可为进一步精确评估森林生态系统生物量和生产力提供基础依据.

Spatio-temporal variation of root biomass of vegetation under subalpine larch forest in Guandi Mountain

Root biomass,spatial distribution and seasonal dynamic of vegetation under subalpine larch forest in Guandi Mountain were studied.It was found that the average annual root biomass of shrub community was 127.16 g/m2,varying from 94.79 g/m2 to 215.57 g/m2,showing a significant seasonal change(P<0.05).65% root biomass distributed in 0-10 cm soil.With the increasing of soil depth,root biomass reduced rapidly,only 25% and 10% distributed in 10-20 cm,20-30 cm,respectively.Seasonal variation was also significant among these three layers.Horizontal variation showed that most roots distributed 20 cm and 100 cm away from the trunks,less in 50 cm.This study was to understand potential underground ecological process of subalpine larch forest and productivity characteristics,providing basic reference to further precise evaluation of biomass and productivity of forest eco-system.