CAJ | 학술논문

光合作用是植物生长和物质积累的基础，其光合特性是高光效竹种选育的重要生理指标。为了更好开发利用我国丰富的竹种资源，确定不同类型竹种的光合性能，掌握其合成有机同化物的能力是必须探索的一个重要问题。文章采用Li-6400光合测定仪，通过对不同地下茎类型的6个竹种光合参数和光响应的测定分析，进一步探讨不同类型竹种存在差异的生理基础，以期对不同类型竹种的选育和经营管理提供依据。试验结果表明：不同竹种净光合速率(Pn)差异显著,大木竹 Bambusa wenchouensis (Wen)Q.H.Dai的净光合速率最高，Pn值平均达到8.379μmol·m-2·s-1，毛竹Phyllostachys heterocycla cv. pubescens和雷竹P. praecox cv．prevernalis次之，斑苦竹Arundinaria oleosa和苦竹Pleioblastus amarus最低，总体呈现丛生竹>散生竹>混生竹的趋势，1~2 a生竹净光合速率高于3~4 a生竹，但没有显著差异。气孔导度(Cond)、胞间C02浓度(Ci)、蒸腾速率(Tr)综合说明丛生竹的光合固碳能力最强，其中蒸腾速率与气孔导度与净光合速率关系最为紧密，是影响净光合速率的主导因子。光响应曲线表明当光强刚开始增强时，各竹种间差异较小，但随着光强的继续增加，不同竹种出现很大的差异，其中绿竹Dendrocalamus.oldhami (Munro) Keng的潜在光合能力最高，远高于其他竹种，同样表现为丛生竹>散生竹>混生竹，进一步说明丛生竹种较强的光合固碳能力，从而为今后不同类型竹种，尤其是优良丛生竹种的筛选和开发利用提供理论参考。
광합작용시식물생장화물질적루적기출，기광합특성시고광효죽충선육적중요생리지표。위료경호개발이용아국봉부적죽충자원，학정불동류형죽충적광합성능，장악기합성유궤동화물적능력시필수탐색적일개중요문제。문장채용Li-6400광합측정의，통과대불동지하경류형적6개죽충광합삼수화광향응적측정분석，진일보탐토불동류형죽충존재차이적생리기출，이기대불동류형죽충적선육화경영관리제공의거。시험결과표명：불동죽충정광합속솔(Pn)차이현저,대목죽 Bambusa wenchouensis (Wen)Q.H.Dai적정광합속솔최고，Pn치평균체도8.379μmol·m-2·s-1，모죽Phyllostachys heterocycla cv. pubescens화뢰죽P. praecox cv．prevernalis차지，반고죽Arundinaria oleosa화고죽Pleioblastus amarus최저，총체정현총생죽>산생죽>혼생죽적추세，1~2 a생죽정광합속솔고우3~4 a생죽，단몰유현저차이。기공도도(Cond)、포간C02농도(Ci)、증등속솔(Tr)종합설명총생죽적광합고탄능력최강，기중증등속솔여기공도도여정광합속솔관계최위긴밀，시영향정광합속솔적주도인자。광향응곡선표명당광강강개시증강시，각죽충간차이교소，단수착광강적계속증가，불동죽충출현흔대적차이，기중록죽Dendrocalamus.oldhami (Munro) Keng적잠재광합능력최고，원고우기타죽충，동양표현위총생죽>산생죽>혼생죽，진일보설명총생죽충교강적광합고탄능력，종이위금후불동류형죽충，우기시우량총생죽충적사선화개발이용제공이론삼고。
Photosynthesis is the basis of plant growth and biomass accumulation. Photosynthetic characteristics is regarded as an important physiological index for high light efficiency in bamboo species breeding. The photosynthetic performance of different bamboo species and their capacities to synthesize organic assimilate are key issues to be understood in order to explore and utilize the rich bamboo resources in China. This research aims at providing theoretical basis for different types of bamboo species selection and management through measuring and analyzing the photosynthetic parameters and light response curve of six bamboo species with different rhizome types, and further exploring the physiological basis of these differences with Li-6400. The results showed that different bamboo species’ net photosynthetic rates (Pn) differed significantly. Bambusa wenchouensis has the highest Pn with an average value reaching 8.379μmol?m-2?s-1 . Phyllostachys heterocycla cv. pubescens and P. praecox cv.prevernalis took the second place. Arundinaria oleosa and Pleioblastus amarus came the last. In general, it showed a trend of sympodial bamboo>monopodial bamboo> amphipodial bamboos. And Pn of 1-2 year old bamboos is higher than 3-4 year old bamboos, but the difference is not significant. An integrated analysis on stomata conductance (Cond), intercellular C02 concentration (Ci) and transpiration rate (Tr) verified that sympodial bamboo has the strongest photosynthetic carbon sequestration capacity. Being the two dominant factors, Transpiration rate and stomata conductance are most correlated with net photosynthetic rate. Light response curve showed that Pn differences among bamboo species were not significant at the beginning stage, but they raced up with light intensity increase, among which, Dendrocalamus.oldhami bears the highest potential photosynthetic capacity and is far higher than other bamboo species. In general, It also showed a trend of sympodial bamboo> monopodial bamboo > amphipodial bamboo, which further verified that sympodial bamboo bears a stronger photosynthetic carbon sequestration capacity. The findings provided a theoretical basis of screening, breeding and utilizing for different bamboo species, particularly for excellent sympodial bamboo species in the future.