河北坝上乔灌木植物根系无机和有机氮吸收速率及其偏好

刘倩愿, 俞振东, 张微微

Uptake rate and preference of inorganic and organic nitrogen in roots of tree and shrub plants in Bashang, Hebei, China

LIU Qian-Yuan, YU Zhen-Dong, ZHANG Wei-Wei

图4 根性状(A)和土壤属性(B)对河北坝上4种植物氮吸收速率影响的冗余分析(RDA)。AD, 根平均直径; AMU, 铵态氮吸收速率; BI, 根分支强度; BR, 根分支比; C:N, 根碳氮比; GLYU, 甘氨酸吸收速率; NTU, 硝态氮吸收速率; RC, 根碳含量; RN, 根氮含量; RTD, 根组织密度; SAM, 土壤铵态氮含量; SC, 土壤有机碳含量; SGLY, 土壤甘氨酸含量; SN, 土壤全氮含量; SNT, 土壤硝态氮含量; SRL, 比根长; SSA, 根比表面积; SWC, 土壤含水量; TNU, 总氮吸收速率。

Fig. 4 Redundancy analysis (RDA) on the influence of root traits (A) and soil characteristics (B) on nitrogen uptake rates of four plants in Bashang region, Hebei. AD, root average diameter; AMU, ammonium nitrogen uptake rate; BI, root branching intensity; BR, root branching ratio; C:N, the ratio of root carbon to nitrogen content; GLYU, glycine nitrogen uptake rate; NTU, nitrate nitrogen uptake rate; RC, root carbon content; RN, root nitrogen content; RTD, root tissue density; SAM, soil ammonium nitrogen content; SC, soil organic carbon content; SGLY, soil glycinate nitrogen content; SN, soil total nitrogen content; SNT, soil nitrate nitrogen content; SRL, specific root length; SSA, root specific surface area; SWC, soil water content; TNU, total nitrogen uptake rate.