基质成分配比对木荷容器苗生长及存苗率的影响

木荷是我国的重要建材树种,幼苗需求量逐年递增,为探索不同基质配比对木荷容器苗生长及生理生化的影响,并筛选出利于木荷容器苗的生长的最佳基质成分配比,以泥炭土、珍珠岩及浙江当地的稻壳、锯末为基质成分,按照一定比例配制成15种基质(A~O),选择可降解无纺布40 mm(φ)×100 mm]为育苗容器,进行木荷容器育苗试验。通过测定分析木荷容器苗的移苗存活率、苗高、地径、生物量、光合参数、根系活力及N、P含量等指标,研究不同基质成分配比的理化性质以及对木荷容器苗移苗存苗率和生长发育的影响。结果表明:不同的基质成分配比显著地影响木荷容器苗的生长及生理特性,A基质的总鲜重与质量指数显著地优于其他基质,而L基质的生物量、质量指数则显著地低于其他基质;O基质的净光合速率(P_n)与气孔导度(G_s)显著地高于其他基质,C基质的P_n,G_s、水分利用率(WUE)显著低于其他基质,其较低的光合参数导致了该基质的木荷苗质量指数较低,生长缓慢。不同的基质成分配比对木荷容器苗的存苗率及生长发育的影响不同。A、O基质为比较优良的轻型基质,对木荷容器苗的生长培育具有重要的意义。

Influence of formulated composition of matrix on growth and seedling survival rate of Schima superba seedlings

Schima superba is one of important tree species for timber forest in China,and the quantity demanded of its seedlings increases yearly.This study explored the influence of different formulated compositions of matrix in growth and physiology and biochemistry of S.superba container seedlings,and selected the optimal formulated compositions of matrix which were beneficial to growth of S.superba container seedlings.For the S.superba container seedlings research,the peat soil,perlite,local rice husk and sawdust were selected to be mixed into 15 formulated compositions of matrix,with biodegradable nonwoven 40 mm(φ) × 100 mm] as the container.By mensurating seedling survival,seedling height,ground diameter,biomass,photosynthetic parameters,root activity and N,P content index of S.superba container seedlings,the research studied the physicochemical properties of different formulated compositions of matrix,and their influence on seedling survival rate and growth and development of S.superba container seedlings.The results showed that the different formulated compositions of matrix significantly affected the growth and physiological property.The total fresh weight and quality index number of A treatment was significantly superior to that of other treatments,while the biomass and quality index number of L treatment was inferior to that of other treatments.The Pn and Gs of O matrix were better than others,but the Pn,Gs and WUE of C treatment were opposite,which indicated that the lower photosynthetic parameter resulted in weak growth of container seedings.The formulated composition of matrix ratio had an significant influence on growth and development of S.superba container seedlings.And different formulated compositions of matrix ratio had different influence on seedling survival rate and growth of S.superba container seedlings.The matrix A and O are better light-medium than the other ones,thus having important significance on the growth cultivation of S.superba container seedling.