摘要
为了解闽北山地针阔混交林的养分循环,以7-9年生不同坡位(上坡、中坡、下坡)的杉木(Cunninghamia lanceolata)-千年桐(Aleurites montana)混交林的鲜叶、凋落叶及0-10 cm土壤层的养分含量为研究对象,分析不同林龄、不同坡位的碳(C)、氮(N)、磷(P)含量及化学计量比差异,探讨杉桐混交林随林龄和坡位变化的化学计量特征.结果表明:(1)两种树种C、N、P含量基本表现为叶片>凋落叶>土壤,且在3个库之间差异显著.(2)混交林叶片N含量较低、P含量较高,凋落叶N、P含量均较低,土壤C、N含量较高而P含量偏低,叶片中较高的P含量是对土壤中相应养分含量缺乏的适应策略.(3)千年桐叶片的C、N、P及杉木的N、P均表现为9年生最高,凋落叶随林龄变化与叶片完全一致;混交林土壤P含量随林龄增加而增大.(4)混交林土壤有机C含量、N含量随坡位变化表现为上坡>中坡>下坡.结合本项目组的前期研究发现,该研究区幼龄期受N和P的共同限制,而在中龄期受N限制减缓,仅受P元素的限制,表明混交林对林木的养分限制状况有一定的改善作用;结果可为我国南方地区针阔叶混交林的可持续经营提供科学依据.(图3表4参43)
To investigate the ecological stoichiometry of fresh leaves, litter, and the top soil layer (0-10 cm) in a mixed forest, a study was conducted on 7- to 9-year-old Cunninghamia lanceolata - Aleurites montana mixed forests in different slope positions (up-, mid-, and down-slope). The results showed that:(1) The carbon (C), nitrogen (N), and phosphorus (P) content in both species were highest in leaves, followed by litter, and lowest in soil, except for the leaves of Aleurites montana, where the content was higher in litter compared to leaves. There were significant differences in C, N, and P content of leaves, litter, and soil.(2) Leaves had a low N content and a high P content. In litter, both the N and P content were low. In soil, the C and N content were high, while the P content was low. The high P content in leaves is an adaptive strategy for lack of nutrient content in the soil.(3) The C, N, and P content were high in leaves of Cunninghamia lanceolate, as were the N and P content in leaves of Aleurites montana in 9-year-old forest stands. The content of these nutrients in the litter was consistent with the leaf content and with the change of stand age, indicating that there is a close relationship between leaves and litter. The soil P content in the mixed forest increased with an increase in stand age.(4) The soil organic C and N content were the highest in the upper slope, followed by the middle slope, and lowest in the lower slope.(5) Compared to previous studies, the 3- to 5-year-old stands in the research area were limited in both N and P. The mid-maturation forest was limited in P only. These results indicate that the mixed forest experienced some improvements regarding the nutrient limitation. Determination of the C, N, and P stoichiometric characteristics of the leaves, litter, and soil in Cunninghamia lanceolate-Aleurites montana mixed forests can provide scientific guidance for the sustainable management of coniferous and broad-leaved mixed forests in southern China.
作者
樊月
陈志为
潘云龙
洪滔
苏少川
吴承祯
林晗
FAN Yue;CHEN Zhiwei;PAN Yunlong;HONG Tao;SU Shaochuan;WU Chengzhen;LIN Han(College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China;Key Laboratory for Forest Ecosystem Processes and Management in Fujian Province, Fuzhou 350002, China;Jianyang Forestry Adiministration, Jianyang 354200, China;Wuyi Universiy, Nanping 354300, China)
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2019年第2期246-253,共8页
Chinese Journal of Applied and Environmental Biology
基金
国家"十三五"重点研发计划项目(2017YFD0601304)
高校科技创新专项基金(KFA17056A)
福建农林大学校重点项目建设专项基金(6112C039N)资助~~
关键词
千年桐
杉木
化学计量学
林龄
坡位
Aleurites montana
Cunninghamia lanceolata
ecological stoichiometry
stand age
slope position
