绞股蓝的生长与环境条件关系的研究

Relationship Between Environmental Conditions and Growth of Gynostemma Pentaphyllum(Thunb.)Makino

该文根据定位观测和实地调查资料，分析了绞股蓝生长状况与生态条件的关系。绞股蓝藤茎生长为昼夜生长类型，夜间生长高于昼间的５５％～６４％，６～８月的生长量占全年生长量的８３％，年生长量的大小取决于６～８月份的水热条件，在多雨年份，绞股蓝生长量较大，反之较小，绞股蓝生长与土壤含水量有密切关系，山坡地上部比下部含水量少，生长量较低。绞股蓝为喜阴植物，一定程度的遮阴条件可促进生长。

Based on located observation and field survey,the relationship between environmentalconditions and growth of Gynostemma pentaphyllum(Thunb.)Makino is analysed.The daily stemelongation of Gynostemma pentaphyllum(Thunb.)Makino is of continuous growthing type,itsgrowth at night is 55%～64%higher than that at day time stem elongation in June,July and Au-gust accounts for 83%of the annual inerement.The annual stem elongation depends on the temper-ature and moisture conditions in June,July and August.In the rainy years,the stem elongation isgreater and conversely,it will be less. The stem elongation of Gynostemma pentaphyllum(Thunb.)Makino is closely related to soil moisture content in June,July and August.The soilmoisture content is lower at the top of hill than at the bottom with lower growth rate of Gynostem-ma pentaphyllum(Thunb.)Makino. Gynostemma pentaphyllum(Thunb.)Makino is a shade-tol-erant species,the stem elongation can be accelerated under shady condition.