摘要
以25年生的杉木人工林为对象,研究了间伐对杉木1～5级根的生物量、形态和氮含量的影响.结果表明:随着根序的增加,杉木细根的生物量、直径和组织密度(RTD)显著增加,而比根长(SRL)、根长密度(RLD)和根数(RN)显著降低.间伐显著提高了1～2级根的生物量、RLD和RN,以及1级和3～5级根的RTD,而对细根的SRL和氮含量无影响;1级和3～4级根的直径显著减小;表层(0～10cm)土壤中的2级根直径明显小于亚表层(10～20cm)土壤,而1～3级根的RLD和1～2级根的RN和氮含量均大于亚表层土壤.间伐和土层的相互作用仅使1～2级根的直径减小.杉木细根的变化主要与间伐后的植被生长及更新密切相关.
Taking a 25-year old Chinese fir （ Cunninghamia lanceolata） plantation as the object, this paper studied the effects of thinning on the biomass, morphological traits, and nitrogen concentration of the first five orders roots. With the increase of root order （ from the first to the fifth order）, there was a significant increase in the fine-root biomass, diameter, and tissue density, and a significantly decrease in the specific root length （SRL）, root length density （RLD）, and root number （RN）. Thinning increased the biomass, RLD, and RN of the first and second orders roots as well as the tissue density of the first, third, fourth, and fifth orders roots significantly, but had no effects on the SRL and nitrogen concentration of each order root. In contrast, thinning decreased the diameter of the first, third, and fourth orders roots significantly. The diameter of the second order roots was obviously smaller in surface （0-10 cm） soil than in subsurface （10-20 cm） soil, while the RLD of the first three orders roots and the RN and nitrogen concentration of the first two orders roots were larger in surface soil than in subsurface soil. The interaction of thinning and soil layer only decreased the diameter of the first two orders roots. It was suggested that the fine-root biomass and morphological traits of Chinese fir were closely related to the vegetation growth and regeneration after thinning.
出处
《应用生态学报》
CAS
CSCD
北大核心
2013年第6期1487-1493,共7页
Chinese Journal of Applied Ecology
基金
国家林业公益性行业科研专项(201104075)资助
关键词
间伐
杉木
根序
生物量
形态特征
thinning
Chinese fir
root branch order
biomass
morphological trait.
