陕北黄土高原铁杆蒿群落生物量初步研究

PRELIMINARY STUDY ON THE BIOMASS OF ARTEMISIA GMELINII COMMUNITY IN THE LOESS PLATEAU AT NORTH SHANXI PROVINCE

本文研究了陕北黄土高原森林区和森林草原地带分布面积广、在群落演替过程中具明显地位的铁杆蒿群落生物量,测定了地上和地下生物量的季节、空间和地带性变化。结果表明,铁杆蒿群落生物量季节动态明显,9月下旬地上和地下生物量均达峰值,分别为241.94g/m^2和1860.46g/m^2,地下生物量6月出现负值,这与植物生长发育阶段的物质运转有关。森林草原由于水条件的限制,地上和地下生物量均低于森林区。

The present paper deals with the bioniass of Artemisia gmelinii which is widely spread and lakes a significant position in the process of community succession in the woodlands and forest steppe on the loess plateau at north Shanxi province. The seasonal, spatial and zonal variations in both the aboveground and underground biomasscs of the above community were examined. The results show that the binmass of Artemisia gmelinii community has obviously seasonal dynamics with the peak biomasses of both the aboveground and underground parts reached in the last clays of September (241. 94g/m2 and 1860. 46g/m2 .respectively ). A negative value of the underground biomass happens in June,and was found to be related to the organic matter transport at the growth and development stages. Owing to the constraint in water conditions, the community in forest steppe has both the aboveground and underground biomasses less than that in woodlands.