4个小叶蚊母树无性系幼苗在不同土壤类型上的生长差异

Growth difference of four Distylium buxifolium clone seedlings in different soil types

为选育适合不同土壤条件栽植的小叶蚊母树Distylium buxifolium无性系,分别以红壤、黄壤、石灰性土和滨海盐土及4个无性系(D1,D7,D13,D19)的1年生苗木为材料,采用温室盆栽方法,测定苗高、地径、冠幅和新梢数量,研究了不同土壤对无性系苗木生长的影响。结果表明:红壤上生长的小叶蚊母树苗高、地径和冠幅生长量显著高于其他3种土壤(P<0.05),而在滨海盐土上生长的小叶蚊母树新梢数量最多(P<0.05)。无性系D19的苗高生长量达到5.7 cm,显著高于D7(P<0.05),无性系D7的地径和冠幅生长量分别为0.74 cm和9.88 cm,显著高于其他无性系(P<0.05),而无性系D13的新梢数量达56.40个,显著多于其他无性系(P<0.05)。小叶蚊母树在不同土壤上的适宜程度为红壤>黄壤>石灰性土>滨海盐土,不同无性系生长的优劣排序为D7>D13>D1>D19。在黄壤上栽植小叶蚊母树可选择D1和D19,在红壤上可选择D7,D13和D19,在石灰性土上可选择D7和D13,在滨海盐土上可选择D1和D7。

Distylium buxifolium is an important native ornamental tree species used extensively in gardens.To choose the right D.buxifolium clones suitable for different soil conditions and to provide references for early promotion and application,this study used potted plants in a greenhouse with red soil,yellow soil,calcareous(lime)soil,and coastal solonchak soil.Four clones D1,D7,D13,D19 of annual nursery stock were used to determine seedling height,ground diameter,crown width,and new tips,and then the influence of different soils on seedling growth was studied.Results showed that seedling height,ground diameter,and crown breadth in red soil were significantly greater(P<0.05)than the other three soil types,while the number of new tips in coastal solonchak soil being the largest(P<0.05).Seedling height of clone D19 reached 5.7 cm,which was significantly higher than clone D7(P<0.05),ground diameter and crown breadth of clone D7 reached 0.74 cm and 9.88 cm,which were significantly higher than other clones(P<0.05),and the number of new tips of clone D13 reached 56.40,which was significantly greater than the other clones(P<0.05).Suitability of soils for D.buxifolium clones was red soil>yellow soil>calcareous soil>coastal solonchak soil.Also,favorable growth of clones was in the order D7>D13>D1>D19.Clone choices of D.buxifolium for soil types could be D1 or D19 for yellow soil,D7 or D13 or D19 for red soil,D7 or D13 for lime soil,and D1 or D7 for coastal solonchak soil.