大针茅草原地上生物量形成的规律与特点  

THE FEATURE AND RULE OF FORMATION OF ABOVEGROUND BIOMASS OF STIPA GRANDIS STEPPE

作　　者：王义凤[1] 

机构地区：[1]中国科学院植物研究所

出　　处：《植物生态学与地植物学学报》1989年第4期297-308,共12页

摘　　要：大针茅草原能进行光合作用的时间为160-170天。地上生物量的季节生长曲线呈单峰型。适宜的收获期在8月份。地上生物量的增长与群落的高度增长呈明显相关(R=0.959)。立枯量于6月份开始出现,其增长规律与绿色量呈相反的趋势。刈割后的再生草量以春季(5月份)刈割后的产量最高。仲夏(7月份)刈割对草场生产力的威胁最大。群落产量结构的研究表明:5cm以上可供牲畜采食的部分约占总产量的70-80%。The rule of aboveground biomass growth of the Stipa grandis steppe,shows a single peak form. This feature fits the climate of Central Asiawith distinct cold and hot seasons, and the corresponding time of hotand rainy season. In the growing season, there are about 160-170 daysfor photosynthesis. The peak value of aboveground biomass and the peakgrowth Night appear at the same time, and this shows an obvious correla-tion(R=0.959). The highest growth rates of both appear 30-50 days aheadof their peaks. But their high relative growth rates are in early spring.Although the biomass is different from year to year, but in the composi-tion of biomass, the proportion′s of grasses and forage are alway thesame. After cutting in early spring (May), the reproductive biomass is atits height. Viewed from the sum of biomass and reproductive biomass atdifferent times, the cutting midsummer (July) affects most exerts the theproductivity of the steppe. The production of the plants under 40cm highmakes up 85-90% of the total biomass.

关 键 词：地上生物量 大针茅草原 

分 类 号：Q948.158[生物学—植物学]