中温型和暖温型草原共有植物种群繁殖分配的比较研究

 1999～2000年在内蒙古草原区的中温型草原和暖温型草原两个研究站点, 分别对大针茅(Stipa grandis)、羊草(Leymus chinensis)、糙隐子草(Cleistogenes squarrosa)、达乌里胡枝子(Lespedeza dahurica)和阿尔泰狗哇花(Heteropappus altaicus) 5个共有种地上生物量、营养元素（全C、全N、全P）和能量（热值）的繁殖分配进行了初步研究。结果表明：两站点共有种各自的地上生物量、全C 和能量之间的繁殖分配较为接近，但全P、全N

A COMPARATIVE STUDY ON REPRODUCTIVE ALLOCATION OF MUTUAL SPECIES IN MODERATE_TEMPERATE AND WARM_TEMPERATE STEPPE

A comparative study of the reproductive allocation of above ground biomass, nutrient elements (total C, total N, total P) and energy (calorific value) in mutual species such as Stipa grandis, Leymus chinensis, Cleistogenes squarrosa, Lespedeza dahurica and Heteropappus altaicus was carried out in the last stage growth seasons during 1999-2000, using two stations of Warm_temperate Steppe and Moderate_temperate Steppe in the Inner Mongolia Steppe Region. Results demonstrate that the reproductive allocation of biomass, nutrient elements (total C) and energy (caloric value) of these species in the two stations is close, but the reproductive allocation of total N and total P is remarkably higher, reflecting the characteristic concentration of the elements N and P in the reproductive organs. Meanwhile, the reproductive allocation proportion of the biomass, the elements and energy of these species are larger in Warm_temperate Steppe than in Moderate_temperate Steppe, except in Leymus chinensis. The findings show one aspect of adaptation to circumstances of extreme fluctuation among different years and extremely uneven well_distribution of precipitation during the growth seasons by the higher reproductive allocation of these species in Warm_temperate Steppe; and reflect that these species adapt themselves to a shorter growth season and unfavourable effects by increasing the allocation proportion of assimilation organs in Moderate_temperate Steppe.