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长期氮沉降对杉木人工林叶、枝氮磷养分再吸收的影响
沈芳芳1,2,李燕燕1,2,刘文飞2,段洪浪2,樊后保2,*(),胡良2,孟庆银3
Responses of nitrogen and phosphorus resorption from leaves and branches to long-term nitrogen deposition in a Chinese fir plantation
SHEN Fang-Fang1,2,LI Yan-Yan1,2,LIU Wen-Fei2,DUAN Hong-Lang2,FAN Hou-Bao2,*(),HU Liang2,MENG Qing-Yin3

图3. 长期氮沉降条件下杉木叶和枝的N、P再吸收率(平均值+标准误差)。黑色柱子表示一年生叶/枝与衰老叶/枝之间的养分再吸收率; 浅灰柱子表示二年生叶/枝与衰老叶/枝之间的养分再吸收率; 白色柱子表示一年生叶/枝与二年生叶/枝之间的养分再吸收率。N0、N1、N2、N3, 施氮量分别为0、60、120、240 kg·hm-2·a-1。不同小写字母表示不同氮沉降水平下达到显著差异水平(p < 0.05)。

Fig. 3. Effects of long-term nitrogen deposition on N and P resorption efficiency in leaves and branches of Chinese fir (mean + SE). The black column indicates the ratio of the nutrient resorption efficiency between one-year old leaves/branches and senescent leaves/branches; light gray column indicates the ratio of the nutrient resorption efficiency between two-year old leaves/branches and senescent leaves/branches; white column indicates the ratio of the nutrient resorption efficiency between one-year old leaves/branches and two-year-old leaves. N0, N1, N2, N3, nitrogen addition 0, 60, 120, 240 kg·hm-2·a-1, respectively. Different lowercase letters indicate significant differences under different nitrogen addition treatment levels (p < 0.05).