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|Table of Contents|

乙烯利对降香黄檀生长和光合生理特性的影响(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2020年01期
Page:
18-24
Column:
专题报道(执行主编 施季森)
publishdate:
2020-01-15

Article Info:/Info

Title:
Effects of ethephon on the growth and photosynthetic characteristics of Dalbergia odorifera
Article ID:
1000-2006(2020)01-0018-07
Author(s):
WANG Yuelin12 XU Daping1* YANG Zengjiang1 LIU Xiaojin1 HONG Zhou1 ZHANG Ningnan1 CHEN Wende2
(1. Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou 510520, China; 2. Tourism and Urban-Rural Planning College, Chengdu University of Technology, Chengdu 610059, China)
Keywords:
Dalbergia odorifera ethephon(ETH) growth photosynthetic characteristics heartwood
Classification number :
S713.8
DOI:
10.3969/j.issn.1000-2006.201809020
Document Code:
A
Abstract:
【Objective】In this study, we documented the growth as well as photosynthetic and physiological characteristics of Dalbergia odorifera after injecting various concentrations of ethephon(ETH)with the aim of collecting data to provide a theoretical basis for efficient cultivation and later heartwood formation. 【Method】Dalbergia odorifera with a DBH of 6-8 cm was taken as the research object and divided into 4 treatments groups, E0.1%, E0.5%, E2.5% and control group(CK). The effect of different treatments on the growth indicators of D. odorifera, namely, growth indicator increment, SPAD value, specific leaf area(SLA), water use efficiency(WUE)and photosynthetic parameters was studied.【Result】Among the 3 ethephon treatments, the DBH increase(ΔD)with E0.1% and E0.5% treatments was larger than that of CK by 8.97% and 6.07%, respectively. Both the increase in tree height(ΔH)and the volume of the individual tree(ΔV)with E2.5% treatment were lower compared to CK with a decrease of 67.39% and 59.33%, respectively. Ethephon had a significant effect on the SPAD value of D. odorifera, and the order was E0.1%> E0.5%> CK> E2.5%. The leaf dry weight and leaf area were significantly higher at E0.1% and E0.5% compared to E2.5%. The order of SLA was E0.1%>E0.5%>CK>E2.5%. According to the Pearson correlation analysis, all ETH treatments had a significant negative effect on both SLA and WUE. The photosynthetic parameters obtained from the light response curve showed that the maximum net photosynthetic rate(Pn, max), initially increased, and then decreased with increasing concentration of ETH. The rate for E0.1% and E0.5% was higher than that for CK by 38.00% and 26.22%, respectively. The light saturation point(PLsp), initially increased, and then slightly decreased with increasing concentration of ETH injected. The values for all the treatments were higher than that for CK while those it was the highest for E0.5%. The light compensation points(PLcp)for all ETH-treated groups were lower than that for CK, and those for E0.1% and E0.5% were significantly lower than that for CK by 16.37% and 20.92%.【Conclusion】Low concentration of ETH could facilitate the chlorophyll content of D. odorifera, SLA, Pn and other photosynthetic characteristics; at a high concentration of 2.5%, ETH was counterproductive to the height and individual tree volume increase of D. odorifera

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Last Update: 2020-01-15