Abstract:In order to study the effects of different mulching methods on soil temperature,photosynthetic parameters and fruit quality in jujube orchard,six soil management modes were compared,which included clear ploughing (CK),artificial planting peanut (T1),ryegrass (T2),branch straw debris (T3),artificial planting soybean (T4) and black film (T5) ,and the best soil management mode was selected by principal component analysis.The results showed that in July,compared with CK,each treatment had obvious cooling effect on soil temperature at different soil layers.Compared with T2,T5 and CK,the cooling effect on soil temperature decreased by 2.87%,10.96% and 12.77% in T4 at 5 cm soil layer,respectively,but soil temperature in T5 significantly increased.Different mulching methods could increase the net photosynthetic rate of leaves to varying degrees,T4 treatment was the most significantin increase of net photosynthetic rate of leaves,which increased 21.67%,40.05% and 36.08% compared with CK in June,July and August,respectively.And the effect of T4 treatment on vitamin content,soluble sugar content and jujube fruit diameter were significantly higher than other treatments,which increased by 25.00%,10.70% and 9.45% compared with CK The correlation and principal component analysis of 16 indexes were carried out,and the comprehensive analysis results showed that the effect of different mulching methods on jujube was T4>T1>T5>T3>T2>CK.To sum up,artificial planting soybean mulching (T4) treatment may be the best way to promote the soil management of jujube orchard in the dry-hot area of Bailong River,Gansu province. |