铺底膜对土壤养分、莲藕光合特性和产量的影响OA

Taking three cultivars of Nelumbo nucifera,Qintang lotus,Elian No.6 and Elian No.10 as materials,two ex-perimental treatments were set:Subsurface geomembrane mulch(M)and no subsurface geomembrane mulch(CK).Ef-fects of subsurface geomembrane mulching on soil nutrient dynamics,growth and photosynthetic parameters of lotus leaves,yield of rhizome were analyzed,in order to provide references for high-quality and high-efficiency cultivation of lotus.The results showed that during 60-150 days after transplanting(DAT),soil pH under M treatment was significantly higher than that under the corresponding CK for all three cultivars.At 180 DAT,soil pH of Elian No.6 under M treatment was significantly higher than that under CK.The content of soil organic matter,total nitrogen,alkali hydrolyzed nitrogen,total phosphorus,available phosphorus,total potassium and available potassium under M treatment were significantly higher than those under the corresponding CK at each sampling date for all three cultivars.At 120 DAT,petiole height and petiole thickness of Qintang lotus under M treatment were significantly higher than those under the corresponding CK.At 90 DAT,petiole height,leaf long radius and leaf short radius of Elian No.6 under M treatment were significantly higher than those under the corresponding CK.At 60 DAT,petiole height and petiole thickness of Elian No.10 under M treat-ment were significantly higher than those under the corresponding CK.At 60 DAT of Elian No.6 and 90 DAT of Qintang lotus,the net photosynthetic rate,stomatal conductance,intercellular CO2 concentration,and transpiration rate under M treatment were higher than those under the corresponding CK.Compared with CK,the rhizome yield under M treatment increased by 109.58%of Elian No.6,65.28%of Qintang lotus,and 42.84%of Elian No.10,respectively.In conclusion,subsurface geomenbrane mulching cultivation pattern of lotus can maintain soil nutrients,improve fertilizer use efficien-cy,promote leaf growth and photosynthetic capacity,and increase rhizome yield.It is a labor-saving and efficient cultiva-tion technique worthy of popularization.