干旱与灌溉生境下少花蒺藜草生物构件的特征

2008年9月20日，在通辽市南郊南沙坨子对干旱与灌溉两个生境下少花蒺藜草（Cenchrus pauciflorus）种群随机取样，并对其不同部位的生物构件特征进行了分析。结果表明，灌溉生境下，少花蒺藜草主株和分蘖的果穗及种子成熟度高于干旱生境，主穗宽、有效穗个数、种长、种宽、种子数均显著高于干旱生境（P＜0.05）；少花蒺藜草分蘖数、叶面积、主株叶片数、分蘖叶片数、节长、节宽均高于干旱生境，且除分蘖叶片数和节长外均差异显著（P＜0.05），根长显著低于干旱生境（P＜0.05）。两种生境下少花蒺藜草叶面积最大值出现在第6、7片叶上。这种生长策略反映了少花蒺藜草对水分的适应性。

Characteristics of biological components of Cenchrus pauciflorus under wet and dry habitats

Abstract: The clonal ramet of Cenchrus pauciflorus in dry and wet habitats were sampled randomly and its structure characteristics of different parts were analyzed in 20th September, 2008 in Tongliao, Inner Mongolia. The result showed that maturity of both central ramets and tiller’s spikes and seeds of C.pauciflorus under irrigation were higher than that of dry habitat. Furthermore, main spike width, number of effective spikes, seed length, seed width and number of seeds were significantly higher (P＜0.05) as well as number of tillers, leaf area, leaf number of central ramet, leaf number of tillers, stem length and stem diameter were also higher than that of dry habitat. Other indicators varied significantly (P＜0.05) except leaf number of tillers and stem length. To the opposite, root length, in dry habitat, was significantly higher than that of wet habitat (P＜0.05). The maximum value of leaf area in two habitats appeared at the sixth and seventh leaf. This growing strategy reflected the reaction of adaptablity to water of C.pauciflorus.