Effects of intercropping on seedlings biomass and non-structural carbohydrates in Cunninghamia lanceolata and Michelia macclurei
To investigate the effects of tree species intercropping on seedling growth,the study selected Cunninghamia lanceolata and Michelia macclurei as objects,setting monoculture C.lanceolata(MC)and monoculture M.macclurei(MM)as controls,and set up no barrier(NB-C、NB-M),mesh barrier(MB-C、MB-M)and plastic film barrier(PB-C、PB-M)to investigate the distribution patterns of seedling biomass and NSC in C.lanceolata and M.macclurei.The results shows that intercropping increased the accumulation of biomass and improved root-shoot ratio in C.lanceolata and M.macclurei,with more significantly effect on C.lanceolata than M.macclurei(P＜0.05).Root biomass in C.lanceolata under MB-C treatment was significantly higher than PB-C treatment(P＜0.05),possibly because nutrients were free to pass through the sieve mesh,further promoting nutrient exchange.Mixed patterns promoted NSC synthesis in the leaf of C.lanceolata and improved NSC concentration of the root and leaf in M.macclurei.The proportion of leaf SS in C.lanceolata and M.macclurei accounted for more than 60％,because photosynthetic products mainly originate from leaf.Compared with MC,MM,in the NB-C、NB-M treatment,the leaf ST content in C.lanceolata increased by 60.20％,but the leaf ST content in M.macclurei significantly increased by 225.93％(P＜0.05).And the root ST content in M.macclurei significantly increased by 93.52％(P＜0.05),while the root ST content in the C.lanceolata only increased by 2.70％.Leaf SS content was in C.lanceolata significantly and negatively correlated with soil AP(P＜0.05),while NSC content in M.macclurei was positively correlated with soil AN(P＜0.01).These results showed that C.lanceolata and M.macclurei seedings can take advantages of complementary ecological niches,improve the nutrient uptake efficiency of the root system,promote plant growth and adjust the allocation strategy of carbon resources in response to soil environmental changes caused by root system intercropping.
万方数据
维普
