不同覆盖层次的温、光变化及对几种蔬菜生长的影响

对春季不同覆盖层次下温度、植株干重的测定表明:不同覆盖层次下温度变化由高到低依次为:三层覆盖＞二层+草＞二层覆盖＞一层覆盖;光照强度强弱的变化为一层覆盖＞二层覆盖＞二层+草＞三层覆盖;随着覆盖层次的不断增加,植株高度不断增加,茎粗不断减小;植株干重的变化为在苗生长初期以二层覆盖和二层+草覆盖方式下最大,后期则以一层覆盖的植株干重最大;在叶绿素方面,蔬菜种类不同,其变化呈现各自不同的规律.

The Change of the Temperature and Light Intensity and the Effect on the Growth of Vegetation under the Different Covering Layer

The study to the temperature and the light intensity in the spring and the plant height and the stemdiameter, the chlorophyll contents and dry matter weight of four kind of vegetables manifested that the change of the temperature under the defferent covering layer took the turn from high to low: three layers covering> two+ mat > two>one layer covering;and that of the light intensity was one> two> two + mat > three. It also showed that the stem diameter was reducing while the height increasing. The two covering layer and the two + mat owed the maxium of the dry matter weight in the early seedling growth whileas the one owed the maxium in the latter; the gross chloropgyll varied from vegetable to vegetable.