小兴安岭三个主要树种生长季节根呼吸  

Root Respiration of Three Dominant Conifer Species in the Lesser Khingan Range During Growing Season

作　　者：董希斌[1] 郭辉[1] 宋启亮[1] 

机构地区：[1]森林持续经营与环境微生物工程黑龙江省重点实验室(东北林业大学),哈尔滨150040

出　　处：《东北林业大学学报》2010年第4期1-2,19,共3页Journal of Northeast Forestry University

基　　金：黑龙江省重大科技攻关项目(GA07B301-05)

摘　　要：选择小兴安岭地区不同树龄的红松(Pinus koruieusis)、云杉(Picea asperata Mast)和落叶松(Larix kaempferi)3个树种为监测对象,测定其根3个径级(0<d≤2mm、2<d≤5mm和5<d≤10mm)的根呼吸速率、比根长、根生物量等指标,分析3个树种的不同树龄、不同根径单位根呼吸速率的差异,建立根呼吸与比根长、土壤湿度和土壤温度的回归方程。结果表明:红松和落叶松在不同树龄随根径增加单位根呼吸速率减少,根径0<d≤2mm明显高于根径2<d≤5mm和5<d≤10mm的单位根呼吸速率;对于云杉,随根径增加单位根呼吸速率未呈现明显变化。生长季节的3个树种,不同根径的单位根呼吸速率与树龄并无显著相关性。通过回归方程的复相关系数R2得知,比根长、土壤湿度和温度是影响红松和云杉根呼吸的主要因素;但落叶松的R2却较低,说明落叶松对比根长、土壤湿度、土壤温度的敏感性较低。Respiration rate,specific root length, and biomass of roots in three diameter classes（0-2, 2-5, and 5-10mm） were determined by selecting Pinus koraiensis, Picea asperata, and Larix kaempferi in the Lesser Khingan Range as the observation objects. The differences in root respiration rate of P. koraiensis, P. asperata, and L. kaempferi trees of different ages and diameter classes were analysed, and a regression equation between root respiration rate and specific root length, soil moisture, and temperature was established. Results showed that respiration rate per root weight of P. koraiensis and L. kaempferi trees of different ages increased with the increase in root diameter, while the respiration rate per root weight of P. asperata trees of different diameter classes did not show obvious changes. For P. koraiensis and L. kaempferi trees, the respiration rate of roots（0-2mm in diameter） were markedly higher than that of roots（2-5 and 5-10mm in diameter）. No remarkable correlations were found between respiration rate per root weight and age of trees of different diameter classes for the three species during growing season. Regression analysis shows that specific root length, soil moisture, and temperature are dominant factors affecting root respiration of P. koraiensis and P. asperata, but the multiple correlation coefficient R2 for L. kaempferi is low, indicating L. kaempferi is insensitive to soil moisture and temperature.

关 键 词：红松 云杉 落叶松 根呼吸速率 比根长 

分 类 号：S718.43[农业科学—林学]