关键词: 乡土树种, 幼苗, 光合固碳, 长江中下游

Abstract: In order to screen out the tree species with strong carbon sequestration ability and good adaptability, a literature search method was used to set the conditions of similar growth conditions, similar seedling age, the same test methods, and common native tree species in Hubei Province. 28 tree species meeting the conditions were screened. The daily net assimilation, daily net carbon sequestration per unit leaf area and light response parameters of each tree species were compared and analyzed, and 28 tree species were classified according to carbon sequestration capacity and photosynthetic efficiency by cluster analysis method. The results showed that the daily net carbon sequestration per unit leaf area of 28 tree species was 4.00~16.49 g/（m²∙d）. The daily net carbon sequestrations of Zelkova serrata, Nerium oleander and Cotinus coggygria var. cinerea were high. Nerium oleander, Quercus variabilis and Pterocarya stenoptera were strongly positive species. While Cinnamomum camphora, Triadica sebifera, Zelkova serrata etc. 9 species belonged to positive tree species. Catalpa bungei, Camptotheca acuminate, Sapindus saponaria etc. 12 species belonged to neutral tree species, while Camellia oleifera, Elaeocarpus decipiens, Castanopsis tibetana and Emmenopterys henryi belonged to shade-tolerant tree species. Pterocarya stenoptera, Triadica sebifera, Zelkova serrata, Toona ciliate, Catalpa bungei, Camptotheca acuminate and Quercus variabilis with high carbon sequestration capacity and strong adaptability could be preferentially used for carbon sink afforestation in Hubei Province and even the middle and lower reaches of the Yangtze River. In the construction of carbon sequestration efficient carbon sink forest, the reasonable collocation of strong positive trees and shade-tolerant shrubs should be considered.

Key words: native tree species, seedling, photosynthetic carbon sequestration, middle and lower reaches of the Yangtze River