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N素指数施肥对降香黄檀及土壤N、P化学计量特征的 影响*
温小莹,黄芳芳,唐成波,甘先华,张卫强
广东省林科院,广东省林科院,广东省林科院,广东省林科院,广东省林科院
摘要:
以降香黄檀(Dalbergia odorifera)苗木为研究对象,用氮素指数施肥法对降香黄檀苗木进行 梯度施肥处理,探讨N 素指数施肥对苗木及土壤氮、磷元素含量及化学计量特征的影响。结果表明,指 数施肥显著影响了植株体内各器官及土壤N、P 含量,随着施肥量的增加,植株体内各器官及土壤N、P 含量呈现逐渐增加的趋势;指数施肥同时影响了植株和土壤的N/P,施肥处理下的植株和土壤N/P 显著 低于未施肥处理。相关分析表明,植株与土壤的元素含量和化学计量存在显著的相关关系。通过叶片 N/P 比值对生长状况进行判断可知,试验中段植株生长受 N、P 元素共同限制,试验结束时则主要受 P 元素限 制。研究表明,N 素指数施肥能够有效提高降香黄檀体内各器官元素含量,在苗木抚育时应注意加强施 肥以促进苗木生长。
关键词:  降香黄檀  指数施肥      化学计量
DOI:
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基金项目:广东省林业科技创新专项项目(2015KJCX029 及 2017KJCX011),林业科技创新平台运行补助项目(2017-LYPT-DW-066 及 2017-LYPT-DW-068)。
Effects of Nitrogen Exponential Fertilization on Stoichiometry Characteristics of Dalbergia odorifera Seedlings and Soil
WEN Xiaoying,HUANG Fangfang,TANG Chengbo,GAN Xianhua and ZHANG Weiqiang
Guangdong Academy of Forestry,Guangdong Academy of Forestry,Guangdong Academy of Forestry,Guangdong Academy of Forestry,Guangdong Academy of Forestry
Abstract:
Through fertilizing seedlings of Dalbergia odorifera with different fertilization levels, we aimed to explore the effects of nitrogen exponential fertilization on stoichiometry characteristics of both plant and soil. The results showed that as fertilization amounts increased, the contents of nitrogen and phosphorus were signi?cantly increased, and that the N/P were also signi?cantly lower under fertilized vs. unfertilized treatments. Correlation analysis also showed that the stoichiometry characteristics were correlated between plant and soil. By compared the leaf N/P to the values from available data, it can be inferred that the seedling growth was N and P-constrained in the middle of the experiment, but switched to P constrain at the end of the experiment. We concluded that nitrogen exponential fertilization can effectively increase the contents of D. odorifera seedlings, and suggested that fertilization should be applied during seedling cultivation to promote their growth.
Key words:  Dalbergia odorifera  exponential fertilization  nitrogen  phosphorus  stoichiometry