水分条件对狗牙根匍匐茎萌发及幼苗生长的影响

Effects of Soil Moisture Content on Stolons Germination and Seedling Growth of Cynodon dactylon

通过控制土壤水分含量的盆栽试验,设置C0(5%),C1(10%),C2(20%),C3(25%),C4(30%)和C5(35%)6个水分处理,研究了不同的土壤水分含量对狗牙根匍匐茎萌发及幼苗生长过程中各项指标的影响。结果表明:(1)随土壤水分含量的增加,狗牙根匍匐茎的萌发率和幼苗株高、叶片数量、叶片长度、叶绿素以及单株生物量均呈先升高后降低的趋势;(2)土壤水分含量与狗牙根幼苗特征值(幼苗株高、叶片数量、叶片长度、单株生物量)存在显著或极显著的相关性;(3)利用高斯模型定量分析狗牙根匍匐茎对土壤水分含量的响应,得出狗牙根匍匐茎萌发及幼苗的最适土壤水分生态幅为[14.78%,30.15%],极限生态幅为[5.65%,38.26%],水分含量对狗牙根匍匐茎萌发幼苗的单株生物量和平均叶片长度影响最为显著。

Stolon of Cynodon dactylon was influenced by soil water content on germination and seedling growth in the process of biological and ecological indexes by pot culture experiment using six soil samples with water content of C0(5%),C1(10%),C2(20%),C3(25%),C4(30%)and C5(35%).The results showed that:(1)with the increase of soil moisture content,the germination rate,seedling height,leaf number,leaf length,leaf chlorophyll and biomass per plant of Cynodon dactylon Stolons were increased firstly and then decreased;(2)with the change of soil moisture content,its biological and ecological characteristics(seedling height,leaf number,leaf length,biomass per plant)value present significant or extremely significant correlation;(3)through the analysis of the response of Cynodon dactylonstolons to different soil moisture by Gauss model,we could predict the germination and seedling of optimum soil moisture ecological amplitude value and limit ecological amplitude value was 14.78%,30.15%and 5.65%,38.26%,respectively.Effects of soil moisture content on Germination seedling biomass and average length of blade of Cynodondac tylonstolons were the most sensitive.