杭州石荠苧生态学特性研究

 杭州石荠苧(Mosla hangchowensis)的种子完全靠风传播，但由于种子大，传播距离不远；种子在冬季休眠，春天(2月末3月初)萌发，种子萌发率很低，尤其是水选上层种子，主要原因是质量差。杭州石荠苧的营养期从3月初到8月上旬，株高在8月中旬以前基本为匀速增加，早期生长极为缓慢。形态和生殖力的环境可塑性极强，自然生长的植株冠幅变动在4～5616cm2之间。杭州石荠苧在自然生境中有时形成单优群落，通常与其它植物伴生。由于早期生长慢，限制了其在群落中的竞争能力，在土壤条件好的地方绝大部分被排挤掉，只是由于其极强的耐旱能力才在高温、干旱、土少的生境中得以存活。 将同属不濒危的华荠苧与之比较，其种子小于杭州石荠苧，但萌发率却高于杭州石荠苧。华荠苧的植株较矮，花色不如杭州石荠苧鲜艳，同在路边生长，不像杭州石荠苧那样容易被人采摘；华荠苧的根较杭州石荠苧的根深，抗雨水冲刷能力较强。华荠苧在自然生境中植株投入生殖的比例大于杭州石荠苧。

A Study on the Ecological Characters of Mosla hangchowensis

The seed of mosla hangchowensis is carried by wind, but the distance is not long because the seed is big. The seed is dormant during the winter and germinated in spring (late Feburary or early March). The ratio of germination, specially the upper layer seed chosen by water was very low because of its low quality. The vegetative stage of M. hangchowensis was from March to August. The height increased in a even speed before the middle of August, and the growth in the early stage was very slow. The morphology and seminal power were affected greatly by environment. The crown range of the plant in natural habitat varied between 4～5616cm2. Sometimes M. hangchowensis composed the consociation in nature habitat, and commonly grown with other species. The competitive ability of M. hangchowensis in community was limited by the slowly growth in the early stage ,so it was pushed out of better soil environment ,and lived only in the habitats where there were high temperature ,aridity and little soil due to its strong bearing ability to drought.As a comparison,the seed of Mosla chinensis wich belonged to the same genus as M. hangchowensis but not endanged was smaller but the ratio of germination was higher. The flower of M. chinensis was smaller than that of M. hangchowensis, and the colour of the plant and flower was not as bright as M. hangchowensis, so it was not easily to be plucked by people like M. hangchowensis, if both of them lived beside the road. The root of M. chinensis was deeper than that of M. hangchowensis, and was not easy to be washed out by rain like M. hangchowensis. The reproduction allometry of Mosla chinensis was bigger than that of M. hangchowensis.