摘要
[目的]研究间伐后杉木人工林碳(C)、氮(N)、磷(P)生态化学计量关系变化,为杉木人工林养分循环研究提供参考。[方法]在浙江开化县林场17年生杉木人工纯林内,建立9块20 m×20 m的固定样地,测定分析了未间伐、中度间伐(20%间伐强度)和强度间伐(37%间伐强度)处理地表凋落物、林下植被、杉木细根和土壤C、N、P含量及其计量关系。[结果]间伐2 a后,强度间伐处理地表凋落物和杉木细根生物量显著降低,林下植被生物量显著增加。强度间伐处理下地表凋落物总氮(TN)含量显著降低,林下植被总氮(TN)含量则显著增加,土壤有机碳(SOC)和总氮(TN)含量也显著增加,杉木细根C、N、P含量在未间伐、中度间伐和强度间伐之间无显著差异。地表凋落物C/N和C/P随着间伐强度增加而增大;林下植被C/N随着间伐强度增加而减小,N/P比随着间伐强度增加而增大;杉木细根和土壤C/N、C/P和N/P在不同间伐处理之间差异不显著。土壤与林下植被C、N、P含量及其比值具有显著相关性。[结论]间伐后短期内杉木人工林地表凋落物、林下植被和土壤C、N含量受间伐强度显著影响,间伐改变了地表凋落物和林下植被C、N、P生态化学计量关系,但对杉木细根和土壤C、N、P生态化学计量关系无显著影响。
[Objective] To study the changes of carbon (C), nitrogen (N) and phosphorus (P) stoichiometry in Chinese fir (Cunninghamia lanceolata) plantations after thinning.[Method] Nine 20 m×20 m plots were established in 17-years-old Chinese fir plantation in Kaihua Forest Farm of Zhejiang. The contents and stoichiometry of C, N, and P in litter, understory, fine roots and soil were studied under three thinning intensities, i.e. unthinning, moderate thinning (20%), and heavy thinning (37%).[Result] After 2 years of thinning, the litter biomass and fine root biomass of Chinese fir decreased significantly ( P <0.05) in the heavy thinning treatment, while the understory vegetation biomass increased significantly. Compared with the unthinned stands, the total N content decreased significantly in the litter and increased in the understory vegetation in the heavy thinning treatment ( P <0.05), and the contents of soil organic carbon and total nitrogen also increased significantly in the heavy thinning treatment ( P <0.05). The contents of C, N, and P in the fine roots of Chinese fir showed no significant difference among the unthinned, 20% thinned and 37% thinned stands. The ratios of C/N and C/P in the litter increased with increasing thinning intensity. The C/N ratio of the understory vegetation decreased with increasing thinning intensity, and N/P ratio increased with increasing thinning intensity. The ratios of C/N, C/P and N/P in the fine root and soil showed no significant difference among the three thinning treatments. There was positive correlation in the contents of C, N and P and their ratios between soil and understory vegetation.[Conclusion] The contents of C and N in the litter, understory vegetation and soil are strongly affected by thinning intensity during a short time after thinning. Thinning alters C, N and P stoichiometry in litter and understory vegetation, but has no effect on fine roots of Chinese fir and soil.
作者
邱勇斌
凌高潮
郑文华
邢文黎
成向荣
QIU Yong-bin;LING Gao-chao;ZHENG Wen-hua;XING Wen-li;CHENG Xiang-rong(Kaihua Forest Farm of Zhejiang Province, Kaihua 324300, Zhejiang, China;Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Hangzhou 311400, Zhejiang, China)
出处
《林业科学研究》
CSCD
北大核心
2019年第4期64-69,共6页
Forest Research
基金
国家重点研发计划项目(2017YFC0505500,2017YFC0505502)
关键词
间伐
杉木人工林
不同组分碳、氮、磷
生态化学计量
thinning
Chinese fir
Cunninghamia lanceolata
carbon
nitrogen
phosphorus
ecological stoichiometry
