施氮对杉木-浙江楠(Cunninghamia lanceolata×Phoebe chekiangensis)混栽苗木生长与植株元素含量的影响  

Effects of nitrogen addition on plant growth and element content of mixed seedlings of Cunninghamia lanceolata×Phoebe chekiangensis

作　　者：杜佳奇 王曼丽 童佳丽 王镜如 朱国亮 伊力塔[1] DU Jiaqi;WANG Manli;TONG Jiali;WANG Jingru;ZHU Guoliang;YI Lita(School of Forestry and Biotechnology,Zhejiang Agriculture and Forestry University,Hangzhou 311300,Zhejiang,China;Forestry Bureau of Jinyun City,Zhejiang Province,Jinyun 321400,Zhejiang,China)

机构地区：[1]浙江农林大学林业与生物技术学院,浙江杭州311300 [2]缙云县林业局,浙江缙云321400

出　　处：《生态科学》2022年第3期214-221,共8页Ecological Science

基　　金：国家自然科学基金项目(31971623)。

摘　　要：为了探究氮沉降背景下杉木和浙江楠混栽苗木的生长特征,于2019年5月模拟两种氮水平(对照0kg·hm^(-2)·yr^(-1)·N、施氮45kg·hm^(-2)·yr^(-1)·N)和三种混栽方式(每盆种植1颗杉木苗木、1颗浙江楠苗木,地上竞争被隔板完全隔绝,地下竞争由三种根系分隔方式控制竞争强度:塑料膜分隔-根系无竞争、尼龙网分隔-根系干扰性竞争、无分隔-根系完全竞争),2019年生长季(5月~12月)施氮处理并对杉木和浙江楠苗木生物量、根系形态和植株元素含量进行分析。结果表明:根系竞争对杉木和浙江楠苗木的根、冠生物量无显著影响(p>0.05)影响,但两种苗木的根系生长随着竞争的加剧而受到抑制作用,种间竞争特别是干扰性竞争能够促进植物对磷的吸收;施氮后,根系竞争促进了根、冠生物量的增加,并对冠生物量的增加更有利,同时,根系干扰性竞争的促进作用最明显。另外,两种苗木的根系生长随着竞争的加剧而受到促进作用。施氮和种间竞争均能促进植物对营养元素的吸收。In order to investigate the growth characteristics of Cunninghamia lanceolata and Phoebe chekiangensis seedlings under the background of nitrogen(N) deposition, two N levels(0 kg·hm^(-2)·yr^(-1)·N and 45kg·hm^(-2)·yr^(-1)·N) and three mixed planting patterns(1 C.lanceolata and 1 P. chekiangensis seedlings were cultivated in each pot;the above-ground competition was completely isolated by clapboard, and the underground competition was controlled by three separation modes: plastic film separation-no roots competition,nylon net partition-root interference competition, and no separation-root complete competition). During the growing season(June to December) in 2019, the biomass, root morphology and plant element content of C. lanceolata and P. chekiangensis seedlings were analyzed under N application. The results showed that root competition had no significant effect(p>0.05) on the root and crown biomass of C. lanceolata × P. chekiangensis seedlings. However, the root growth of these two kinds of seedlings was inhibited with the increase of competition. Interspecific competition, especially interference competition, could promote the absorption of phosphorus.After N application, root competition promoted the increase of root and crown biomass, and was more beneficial to the increase of crown biomass. At the same time, the promotion effect of root interference competition was the most obvious. In addition, the root growth of these two kinds of seedlings was promoted with the increase of competition. Both N application and interspecific competition can promote the absorption of nutrient elements.

关 键 词：氮沉降 生长 植株元素含量 杉木 浙江楠 

分 类 号：Q945[生物学—植物学]