移栽胁迫对红鳞蒲桃群落5种优势植物苗木生理特征的影响

The Influence of Transplanting Stress on Seedlings Physiological Characteristic of Five Dominant Species in Syzygium hancei Communities

【目的】筛选出红鳞蒲桃(Syzygium hancei)群落5种优势植物中最适宜移栽的种类。【方法】通过考察移栽失水对植物叶绿素荧光参数的影响来探讨红鳞蒲桃对移栽胁迫的抗逆性。【结果】起苗后24h内,5种植物的叶绿素含量下降未达到显著水平(P>0.05),但叶绿素荧光参数Fv/Fm、ΦPSⅡ、qP、NPQ和Fv/Fo变化显著(P<0.01),其失水率与起苗时间显著正相关(P<0.01)。移栽胁迫对喙果皂帽花(Dasymaschalon rostratum)的影响最大,其次为红鳞蒲桃,对打铁树(Rapanea linearis)和紫荆木(Madhuca pasquieri)的影响相对较小,对下龙新木姜(Neolitsea alongensis)的影响最小。【结论】5种优势植物中,下龙新木姜为最适合移栽的种类,其次为打铁树和紫荆木,喙果皂帽花对移栽胁迫抗逆性较差,不宜选择;建议各树种的最佳移栽时间为起苗后16h内。

Objective]The purpose of this study is to select the most suitable transplanting species from five dominant plants in Syzygium hancei communities in Wutou,Jiangping and Fangchenggang,Guangxi.[Method]The changes of plant chlorophyll fluorescence parameters was used to study the plant stress resistance to transplanting stress.[Result]During the first 24h after lifting of seedlings,the chlorophyll content of the five species showed no signifi-cantly change (P >0.05 ),while the chlorophyll fluorescence parameters (Fv/Fm,ΦPSⅡ, qP ,NPQ and Fv/Fo)significantly changed with time (P <0.01).The water loss rates correlated significantly with time(P<0.01).The results showed the influence of transplan-ting stress on five dominant species was significant.The order of transplanting stress effects on Syzygium hancei was D.rostratum,S.hancei,R.linearis,M.pasquieri and N. alongensis.[Conclusion]The most suitable species for transplanting was N.alongensis,then R.linearis and M.pasquieri.D.rostratum demonstrated low stress resistance and was not suitable for transplanting.The optimal time for transplanting of the selected species was 0 to 16h after lifting of seedlings.