长鞭红景天生物量基本特性研究

长鞭红景天Rhodiola fastigiata是著名的珍稀药用植物之一。对西藏色季拉山区4个不同生境中的长鞭红景天的生物量调查分析结果表明：环境条件对长鞭红景天各构件的平均含水率影响较大,但对各构件平均含水率占株平均含水率的比例影响不大;总体上植株各构件的平均含水率所占的比例大小顺序是：花茎及叶〉地下部分〉主轴及侧枝,地上部分、地下部分及植株整株三者的含水率相接近,无显著差异。长鞭红景天地上部分与地下部分鲜质量比为6.65、干质量比为7.57,平均生物量为5.7213g·株^-1,资源量为93.8244kg·hm^-2。主轴及侧枝、地上部分和植株的生物量随花茎环数变化呈现出相似规律,总体上呈“S”形,用Logistic方程拟合,都达到了显著水平（P〈0.01）;三者环境容纳量分别为12.7497,13.2269和15.5345,相应瞬时增长率为0.2779,0.3386和0.3169。花茎及叶和地下部分的生物量随花茎环数变化呈现出的规律,用多项式拟合较显著。基径与各部分生物量关系用幂函数来拟合时,除花茎及叶和地下部分的相关系数较低外,其他三者相关系数都在0.8以上。图3表3参12

Biomass of Rhodiola fastigiata

Rhodiola fastigiata is a famous, rare medicinal plant found in China. In order to rational utilization of this plant, its biomass was analyzed in four different habitats of Sejila Mountain in Tibet （Xizang） using correlation analysis. Results showed that environmental conditions affected average moisture content with scape and leaf 〉 belowground （root） 〉 main and branch stems, but not the ratio of the average modular moisture content to the average moisture content. The ratio of the fresh weight of aboveground to belowground parts was 6.65; the dry weight ratio was 7.57; the average individual biomass was 5.721 3 g; and the resource capacity was 93.8 kg·hm^-2. Biomass of main and branch stems, aboveground parts, and the individual plant showed similarities（P〈0.01） to stem rings, which correlation curves was ＂S＂ shaped; these were fit to a logistics equation; their environmental capacities were 12.749 7, 13.226 9 and 15.534 5, and their corresponding instantaneous growth rates were 0.277 9, 0.338 6 and 0.316 9, respectively. Stem and leaf biomass as well as belowground parts had a significant （P〈0.01） correlation with a polynomial, which were fit to a logistics equation. Also, basic diameter to biomass of various parts were fit to a power function with correlation coefficients of r =0.802 1 for the main and branch stems, r = 0.803 2 for the aboveground parts, and r = 0.812 9 for the individual plant. Ch, 3 fig. 3 tab. 12 ref.]