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ZHANG Wen1, YAN Tao2, CHANG Wen-jing1*, ZENG Hui1
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Abstract: Under the context of increasing nitrogen (N) deposition, studies on the effects of N addition on leaf N resorption of plantations with different ages could improve our understanding of the response of forest ecosystems to climate changes. In this study, we explored the effects of different N addition levels (no N added as control, CK; 20 kg N·hm-2·a-1 as low N addition, N20; 50 kg N·hm-2·a-1 as high N addition, N50) on leaf dry mass, leaf volume, leaf N concentration and N resorption efficiency (NRE) of Larix principisrupprechtii with different ages (i.e. S11, S20 and S45 represented 11-, 20- and 45-year-old stand, respectively). The results showed that the dry mass of both green and senescent leaves decreased with increasing stand ages (P<0.05). During the leaf senescence, the loss of leaf dry mass in S20 was significantly greater than those of S11 and S45 (P<0.01). The loss of leaf volume in S45 was significantly lower than those in S20 and S11. N addition significantly decreased the volume of green leaf in S11 before senescence (P<0.05). Leaf N resorption efficiency of S11 was significantly lower than those of S20 and S45 (P<0.001). Furthermore, the reduction of NRE caused by N addition in S11 was significantly larger than the corresponding values in S20 and S45 (P<0.01). Our results areimportant for accurate assessment of N cycle in forest ecosystem and better understanding of growth strategies of forest ecosystems.
Key words: stomatal conductivity optimization model, abscisic acid, hydraulic regulation, water-regulation strategy
ZHANG Wen, YAN Tao, CHANG Wen-jing, ZENG Hui. Effect of nitrogen addition on leaf nitrogen resorption of Larix principis rupprechtii plantations with different ages.[J]. cje.
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URL: https://www.cje.net.cn/EN/abstract/abstract23509.shtml
https://www.cje.net.cn/EN/Y2018/V37/I12/3525