武夷山不同海拔黄山松根系生物量季节变化特征  

Seasonal variation in the root biomass of Pinus hwangshanensis along an altitudinal gradient in Wuyi Mountain

作　　者：杨福春[1,2,3] 郭炳桥 孙俊 范瑞瑞[1,2,3] 孙蒙柯 陈晓萍[1,2,3] 郭英荣 袁荣斌 程林 钟全林 程栋梁 

机构地区：[1]福建师范大学地理科学学院,福州350007 [2]福建省植物生理生态重点实验室,福州350007 [3]湿润亚热带山地生态国家重点实验室培育基地,福州350007 [4]江西武夷山国家级自然保护区管理局,上饶334500

出　　处：《应用与环境生物学报》2017年第6期1117-1121,共5页Chinese Journal of Applied and Environmental Biology

基　　金：国家自然科学基金项目(31370589,31170374);福建省杰出青年科学基金(2013J06009);福建省青年拔尖人才支持计划资助~~

摘　　要：为揭示植物对环境的适应机制,以江西武夷山国家自然保护区的黄山松为研究对象,探讨该地5个海拔梯度(1 200、1 400、1 600、1 800、2 000 m)的黄山松根系生物量(根的直径d≤5 mm)的季节变化特征.结果显示:江西武夷山黄山松细根(d≤2 mm)年度内的平均生物量为158.76 g/m^2,中根(2 mm<d≤5 mm)年度内的平均生物量为4.68g/m^2.海拔对黄山松细根、中根的生物量均有显著的影响.季节对黄山松细根生物量无显著影响,但对中根生物量具有显著影响,即在同一海拔中根生物量具有显著的季节差异,冬季中根生物量显著高于其他季节(P<0.05).上述表明细根与中根生物量不同的季节变化规律体现了不同类型根系在不同生长季具有不同的生长策略,而海拔间的变化则体现不同类型根系在不同生境下的环境适应,结果可为保障我国黄山松林业可持续发展提供理论依据.Understanding the seasonal variation in root biomass （root diameter less than or equal to 5 mm） of Pinus hwangshanensis would provide a theoretical basis for the sustainable development of P. hwangshanensis forestry in China. In the natural habitat of P. hwangshanensis, five investigation sites along an elevational gradient from 1 000 m to 2 000 masl （meters above sea level） were established at 200 m intervals. The root biomass of P. hwangshanensis, along with the diameter at breast height （DBH） and plant height （H）, were measured seasonally at each elevational site. We found that the average annual biomass of small roots （d ≤ 2 mm） and medium roots （2 mm 〈 d ≤ 5 mm） was 158.76 g/m2 and 4.68 g/m2 respectively. The fine-root biomass and medium-root biomass of P. hwangshanensis changed significantly along the elevational gradient. The fine-root biomass of P. hwangshanensis did not change from season to season. At each site, however, the medium-root biomass varied significantly across seasons, with higher biomass observed in winter than in all other seasons （P 〈 0.05）. In summary, the fine-root biomass and medium-root biomass of P. hwangshanensis varied significantly along the elevational gradient; the biomass of fine and medium roots showed divergent seasonal variations, suggesting that different seasonal growth mechanisms occurred between the two root types.

关 键 词：黄山松 根系 生物量 海拔梯度 季节变化 

分 类 号：S718.5[农业科学—林学]