鄂尔多斯沙地油蒿群落生物量初步研究

PRELIMINARY STUDY ON BIOMASS OF ARTEMISIA ORDOSICA COMMUNITY IN ORDOS PLATEAU SANDLAN OF CHINA

本文研究了鄂尔多斯沙地草原改良试验站颇具特色的油蒿群落生物量的季节变化和空间格局。结果表明：不同的油蒿群落类型生物量不同，以流动沙地最低，接近流沙地段的油蒿群落最大。油蒿群落地上生物量季节变化明显，９月中旬或稍后达到最大值。油蒿群落地下部分生物量以粗根为主，根量集中于表层，且随着深度的增加按指数形式递减。

The spatial pattern and seasonal dynamics of the aboveground and below- ground biomass in Artemisia ordotica communities were studied at Ordos Sandy Grassland lmproving Experimental Station of the Grassland Research Institute,the Chinese Academy of Agricultural Sciences,in 1 991.The results showed that the aboveground biomass of the Artemisia ordosica community varied with community types,with the shifting sandland having the lowest biomass,while the semi-shifting sandland the highest.The aboveground biomass of a single dominant Artemisia ordosica community showed apparent seasonal dyn. amics,with a peak occurring in the middle of September or later.Thick roots accounted for the highest portion of belowground biomass in the Artem- isia ordosica community,and the majority of the roots was concentrated in the upper layer(0一20cm)of the soil.The vertical distribution of belowgr- ound biomass can be described by exponential equations,showing clearly the trend of decreasing belowground biomass as a function of increasing soil depth.