不同种源花榈木苗期生长及生理特性比较.

In order to understand the growth characteristics and differences of different Ormosia henryi provenances in Guiyang, we collected seeds from ten different provenances of O. henryi and conducted seedling experiments. We compared differences in seedling height, root collar diameter, biomass, leaf photosynthetic parameters, photosynthetic pigment, activity of nitrate reductase, content of nitrate nitrogen and the root activity of the biannual seedlings, and then analyzed the differences in ten provenances of O. henryi. The results were as follows:(1)There were significant differences in the net photosynthetic rate(Pn), stomatal conductance(Gs), intercellular carbon dioxide concentration(Ci), transpiration rate(Tr)and water use efficiency(WUE)among ten O. henryi provenances(P<0.05), indicating that different O. henryi provenances showed significant differences in photosynthetic characteristics and light use efficiency. Plants from Hangzhou and Yongkang of Zhejiang had the higher photosynthetic growth potential.(2)There were significant differences in chlorophyll content, nitrate reductase, nitrate nitrogen and root activity among provenances. The contents of chlorophyll a and chlorophyll b and total content of chlorophyll were the highest in Jian'ou of Fujian provenance. These plants could efficiently transfer the accumulated light energy during the initial reaction of photosynthesis and promote carbon assimilation. Huaxi of Guizhou provenance had the highest nitrate reductase activity, the highest nitrate nitrogen content, and strong utilization ability of nitrogen elements, which could promote the synthesis of plant protein, amino acid and chlorophyll. The root system from plants in the Wangmo of Guizhou provenance had the greatest activity and the ability to absorb nutrients.(3)There were significant differences in the distribution of seedling height, ground diameter and biomass among all provenances. The plants from Hangzhou of Zhejiang provenance had luxuriant branches and leaves, developed roots and good growth performance, while the plants from Huangshan of Anhui provenance were short and had poor growth performance. Hangzhou of Zhejiang provenance distributed more biomass in roots and leaves to increase the ability of roots to absorb nutrients and leaves to acquire light energy. Huangshan of Anhui provenance accumulated the least biomass and had the worst growth.(4)The adaptability of ten provenances of O. henryi was comprehensively evaluated by principal component analysis. The results showed that Hangzhou of Zhejiang provenance > Liping of Guizhou provenance > Yongkang of Zhejiang provenance > Wangmo of Guizhou provenance > Jian'ou of Fujian provenance > Kaili of Guizhou provenance > Shiqian of Guizhou provenance > Hauxi of Guizhou provenance > Pingtang of Guizhou provenance > Huangshan of Anhui provenance. In conclusion, Plants from Hangzhou of Zhejiang, Liping of Guizhou and Yongkang of Zhejiang O. henryi provenances had high potential for adaptation and growth potential in Guiyang. [ABSTRACT FROM AUTHOR]