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当前位置: 首页 > 文章 > 外源Ca~(2+)对南林895杨扦插苗生长及稳定同位素δ~(13)C,δ~(15)N动态分布的影响 林业科学 2010,46 (6) 54-60
Position: Home > Articles > Effects of Exogenous Ca~(2+) on Growth and Dynamic Distribution of Stable Isotope δ~(13)C,δ~(15)N of Populus × euramericana‘Nanlin 895’Cuttings Scientia Silvae Sinicae 2010,46 (6) 54-60

外源Ca~(2+)对南林895杨扦插苗生长及稳定同位素δ~(13)C,δ~(15)N动态分布的影响

作  者：
王雷;尹增芳;尤禄祥;李建银;于明祥;徐棉芬
单  位：
南京林业大学森林与环境学院
关键词：
南林895杨;外源Ca2+;生物量;δ13C;δ15N
摘  要：
利用形态检测与稳定同位素技术,分析不同质量浓度外源Ca2+(CaCl2)处理下,南林895杨扦插苗株高、地径、生物量的变化情况以及各营养器官δ13C,δ15N值的动态变化。结果表明:不同质量浓度的外源Ca2+均能不同程度地促进苗木的生长。外源喷施Ca2+后,扦插苗株高、地径、生物量均优于对照,其中以200mg·L-1质量浓度的Ca2+处理效果最好,其单株平均株高、地径、生物量分别比对照增加14.82%,18.01%,19.7%。随着Ca2+质量浓度(0,2,20,100,200,300mg·L-1)的升高,南林895苗木叶、茎、根中δ13C,δ15N值均呈现逐渐上升然后缓慢下降的趋势,且最大值出现在Ca2+质量浓度为200mg·L-1处。δ13C,δ15N值在植株中的分布遵从"库"器官大于"源"器官的规律。相关性分析表明:"源"器官δ13C,δ15N值与株高、地径呈显著性负相关,与生物量呈正相关;"库"器官δ13C,δ15N值与株高、地径、生物量均呈显著正相关。不同营养器官δ13C,δ15N值的动态变化在一定程度上可以反映南林895杨扦插苗"源""库"器官间光合同化物积累与再分配格局对外源Ca2+质量浓度的响应。
译  名：
Effects of Exogenous Ca~(2+) on Growth and Dynamic Distribution of Stable Isotope δ~(13)C,δ~(15)N of Populus × euramericana‘Nanlin 895’Cuttings
作  者：
Wang Lei Yin Zengfang You Luxiang Li Janyin Yu Mingxiang Xu Mianfen (College of Forest Resources and Environment,Nanjing Forestry University Nanjing 210037)
关键词：
Populus × euramericana‘Nanlin 895’; exogenous Ca2+; biomass; δ13C; δ15N
摘  要：
In this paper,growth in height,caliper,and biomass,and dynamic changes of the δ13C and δ15N value in the vegetative organs of Populus × euramericana‘Nanlin 895’cuttings were investigated in response to different concentrations of exogenous Ca2 + treatments. The experimental results showed that different concentrations of exogenous Ca2 + were able to promote the plant growth; the height,caliper,and biomass increments were all greater than the control after spraying exogenous Ca2 + ,among which the 200 mg·L -1 Ca2 + concentration exhibited the best effect. Compared with the control, the average of the height,caliper and biomass treated with 200 mg·L -1 Ca2 + increased by 14. 82% ,18. 01% ,and 19. 7% respectively. The stable isotope,δ13C and δ15N,enrichment capacity of the Populus × euramericana‘Nanlin 895’ cuttings were affected by different concentration exogenous Ca2 + to various degrees. With the Ca2 + concentration increased (0,2,20,100,200,300 mg·L -1),the δ13C and δ15N values of the leaf,stem and root presented a gradual increase at low concentrations,and then slowly declined at high concentration,with the maximum value appeared at the concentration of 200 mg·L -1 Ca2 + . The distribution of δ13 C and δ15 N value in the plant complied with the principle that the "sink" organ was more than the"source"organ. The correlation analysis showed that both the δ13C and δ15N values of"source" organ had a significantly negative correlation with the height,caliper,and the positive correlation with biomass. The δ13C, δ15N value of"sink"organ had a significantly positive correlation with the plant height,caliper,and biomass. The δ13C, δ15 N value dynamic changes of different vegetative organs reflected to a certain extent accumulation and redistribution patterns of the photoassimilates in the"source"and"sink"organs of Populus × euramericana ‘Nanlin 895’cuttings in response to exogenous Ca2 + concentration.

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