陕北黄土高原大油芒群落生物量初步研究

 本文研究了陕北黄土高原区森林地带分布面积广、草质优良，而且在畜牧业生产中有重要意义的大油芒群落生物量，测定了地上、地下生物量以及季节和空间变化。研究结果表明，大油芒群落生物量季节动态较为明显，9月中旬地上生物量达到峰值(243.1g／m2)；地下生物量在返青期较高，生长旺盛期略偏低，枯黄期最高，这同植物生长发育阶段的物质运转有关。

A PRELIMINARY STUDIES ON THE BIOMASS OF SPODIOPOGON SIBIRICUS COMMUNITY ON WOODLAND OF LOESS PLATEAU IN NORTH SHANXI PROVINCE

Not only the distribution range of the Spodiopogon sibiricus communityon woodland of the loess plateau in north Shanxi Province is widespread,its quality is also excellent. It occupies a very important position in ani-mal husbandry. We have investigated the seasonal and spacial variationof both aboveground part and underground biomass in Spodiopogon sibiri-cus community. The result indicates that: the biomass seasonal dynamicswas evident, the biomass of aboveground achieved peak value (243.lg/m~2)in the midmonth of September; the biomass of underground was mediumduring the reviving period, minimum during flourishing period, maximumduring the withering period. The observed facts are related to the stagesand organic matter transport.