【摘要】 甘肃天祝金强河地区高山线叶嵩草草地的地上植物量在6～11月呈单峰曲线变化,最大植物量出现在8月21日,为373.02克/米~2干物质,或336.67克/米~2有机物质(去灰分物质);净第一性生产力为340.09克/米~2年干物质,或307.97克/米~2·年有机物质。地下植物量6～10月平均为5162.66克/米~2干物质,呈U形曲线变化;净第一性生产力为780.36克/米~2年干物质,或671.15克/米~2·年有机物质,其中活根为570.91克/米~2·年干物质,或489.27克/米~2年有机物质。地上部分最大绝对生长率出现在7月20日至8月21日,平均为5.16克/米。·天干物质,之后变为负值。地下部分绝对生长率在8月21日以前为负值.最大负值出现在7月20日至8月21日,表明地上部分的最大生长对地下部分营养物质的供给有强烈的依赖性。最大相对生长率出现在5月1日至6月20日,为0.0965克/克·天干物质。表明地上部分的生长效率以生长初期最高。更多还原

【Abstract】 The study was made native alpine Kobresia capillifolia grassland at Tianzhu Alpine Grassland Experimntal station of Gansu Agricultural University approximately 150 KM northwest of Lanzhou, Gansu province, China, Outlines of the results were as follows: 1.The change of aboveground phytomass was expressed monopeak curve during growth season and maximum value was 373.02g/m~2dry matter (DM) or 336.67g/m~2organic matter (OM) occurred on August 21 and then declined. Net primary production was 340.09g/m~2. yr DM (30797 OM ) 2.Underground phytomass of the grassl and was quite heavy about mean 5Kg/m~2DM and the change of which, contrary to aboveground, was expressed monovalley curve during growth season. The lowest value of the.underground phytomass was 4717.51g/m~2DM(4045.23g/m~2OM)occurred on August 21 to september 22 and net primary prodution 780.36g/m~2.yr DM (671.150M) . 3.Both maximum absolut growth rate (5.16g/m~2. day DM) of aboveground and minimum absolut growth rate (-15.91g/m~2. day DM)of underground were occurred on July 20 to August 21, but maximum relative growth rate of aboveground(0.0915g/g, day DM) occurred during early of growth season, it is suggested that maximum increase of aboveground phytomass depend clearly on underground for energy and matter, while highest efficiency of which was in early of the growth season.更多还原