7种园林地被植物耐盐性研究

应用不同NaCI水溶液处理法，比较研究了华南地区栽培的7种常见地被植物幼苗在盐胁迫条件下的存活率、盐害指数、叶绿素荧光参数、根和叶的K＋浓度、Na＋浓度、K＋／Na＋值、叶片相对电导率和相对含水量等指标，并运用隶属函数值对其植物耐盐性进行综合评定。结果表明：在7种参试植物中，小蚌兰Rhoeospathacea和鸢尾Ir...

Study on the Salt Tolerance of 7 Groundcover Plants

The survival rate, the salinity susceptibility indexes, chlorophyll fluorescence parameters, the content of K＋ and Na＋, K＋/ Na＋ ratio, relative conductance and water content of seven cultivated groundcover plant seedlings in South China under the salt stress were studied by growth experiment. One year old seedlings were exposed to four level treatments of salt treammnts（contained 0, 2, 4, 6 g NaCl/kg soil）. Effects of NaC1 on the seedling survival and growth were analyzed. The salt tolerance of 7 groundcover plants was assessed. The results showed that Rhoeo spathacea and Iris tectotlnn were the most salt-tolerant species among 7 herbs studied and could maintain nonnal growth in the soil salinity below 6%o. Syngonium podophyllum＇White Butterfly＇and Zephyranthes can＆da were of moderately tolerance and could maintain normal growing in the soil salinities between 2~4 %o. Euonymus fbrruzwi, AJpi, lia sanderae ＇Varie~,ta＇, and Tradesz-antia sillamontana were less salt-tolerant and could maintain nom~al growth in the soil salilfity lower than 2 ‰. Under the salt stress, the survival rate, chlorophyll fluorescence, K＋/Na＋ ratio, relative water content of the plants decreased with the salt stress, while the salinity susceptibility indexes, the content of Na＋ as well as relative conductance of the plants increased with the salinity of the soil. However, no clear trend was found for the variation of content of K＋.