不同林龄杉木+闽楠复层异龄混交林土壤碳氮磷化学计量特征  

Growth and Stoichiometry Characteristics of C, N and P in Soil under Mixed Plantation of Different Aged Cunninghamia lanceolata and Phoebe bournei

作　　者：凌高潮 沈汉 范荣德 张能军 夏晨晨 胡卫明 LING Gao-chao;SHEN Han;FAN Rong-de;ZHANG Neng-jun;XIA Cheng-cheng;HU Wei-ming(Kaihua Forest Farm of Zhejiang,Kaihua 324300,China)

机构地区：[1]开化县林场,浙江开化324300

出　　处：《浙江林业科技》2022年第6期14-20,共7页Journal of Zhejiang Forestry Science and Technology

基　　金：浙江省林业发展和资源保护专项基金(浙财建﹝2019﹞20号)。

摘　　要：为阐明杉木Cunninghamia lanceolata+闽楠Phoebe bournei复层混交林随林龄变化的土壤养分特征,以浙江省开化县林场混交6 a、10 a和15 a的杉木+闽楠复层混交林以及杉木纯林为研究对象,研究了土壤养分及其土壤碳、氮、磷化学计量比随林龄的变化特征。结果表明:(1)林分地上部分生物量、根系生物量、凋落物生物量均随着混交时间的增加而增大,但林下植被生物量随着混交时间的增加逐渐减少。(2)土壤碳、氮、磷含量随着混交时间的增加而增大,混交15 a杉木+闽楠复层混交林土壤有机碳、总氮和总磷含量分别比杉木纯林增加了55.4%、83.9%和84.7%,不同林龄混交林的土壤碳、氮、磷含量均显著高于CK(P<0.05);土壤密度随着混交时间的增加逐渐降低,而土壤pH、碳氮比(C∶N)、碳磷比(C∶P)和氮磷比(N∶P)变化相对较小。(3)林分地上部分生物量和根系生物量与土壤有机碳、总氮和总磷显著正相关。以上结果表明,将杉木纯林改造为杉木+闽楠复层混交林可以提高林分生产力,改善土壤质量,有利于杉木人工林可持续经营。In 2006, 2011 and 2015, 1-year container Phoebe bournei seedlings were mix planted in Cunninghamia lanceolata plantation afforestated in 1989 in Kaihua, Zhejiang province. In June 2021, sample plots were established in above-mentioned three plantation and pure C. lanceolata stand and determination was implemented on their soil nutrient contents and stoichiometry of soil C, N, and P. The results showed that biomass of aboveground, root and litter in mixed plantations increased with the stand age, but the understory vegetation biomass decreased gradually. The contents of soil organic carbon, nitrogen and phosphorus also increased with stand age. The contents of soil organic carbon, total nitrogen and phosphorus in the 15-year mixed plantation increased by 55.4%, 83.9%, and 84.7% than that in the pure C. lanceolate plantation. Bulk density in mixed plantation decreased gradually with the stand age, while soil pH, ratio of C/N, C/P and N/P had a little change. The biomass of above ground stand and root had evident positive relation with soil organic carbon, total nitrogen, and total phosphorus.

关 键 词：杉木+闽楠复层混交林 林分生长 土壤养分 土壤化学计量 

分 类 号：S718.516[农业科学—林学]