文章摘要
葛露露, 孟庆权, 林宇, 何宗明.滨海沙地不同固氮树种叶片氮、磷重吸收与生物固氮的耦合关系[J].水土保持学报,2019,33(1):134~138,144
滨海沙地不同固氮树种叶片氮、磷重吸收与生物固氮的耦合关系
Coupling Relationship Between Biological Nitrogen Fixation and Leaf Resorption of Nitrogen and Phosphorus of Different Nitrogen Fixing Tree Species in Southeast Coastal Area
投稿时间:2018-07-15  
DOI:10.13870/j.cnki.stbcxb.2019.01.022
中文关键词: 滨海沙地  养分重吸收  生物固氮
英文关键词: southeast coastal area  nutrient resorption  biological nitrogen fixation
基金项目:国家自然科学基金项目(31570604,41371269);福建省林业科技项目(闽林科[2014]2号);福建农林大学林学高峰学科项目
作者单位E-mail
葛露露1, 孟庆权1, 林宇2, 何宗明1 1. 福建农林大学林学院, 福州 350002

2. 福建省长乐大鹤国有防护林场
, 福建 长乐 350212 
hezm2@126.com 
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中文摘要:
      福建滨海沙地氮磷养分匮乏,季节性干旱严重。养分重吸收可以减弱植物对土壤养分供应的依赖,从而增强植物适应逆境的能力。以福州市滨海后沿沙地人工营造的木麻黄、肯氏相思和纹荚相思人工林为研究对象,进行不同叶龄(成熟叶、衰老叶)叶片N、P浓度及稳定氮同位素丰度值(δ15N)的测定,通过统计手段研究叶片N、P重吸收效率(NRE、PRE)、重吸收度(NRP、PRP)及其与生物固氮率的关系。结果表明:(1)滨海沙地不同固氮树种叶片NRE表现为纹荚相思(52.80%) > 肯氏相思(28.27%) > 木麻黄(24.63%),纹荚相思叶片NRE显著高于肯氏相思和木麻黄,但后两者间显著差异;PRE表现为肯氏相思(74.08%) > 纹荚相思(63.99%) > 木麻黄(40.47%),且相互之间差异显著。(2)滨海沙地不同固氮树种生物固氮率表现为肯氏相思(69.45%) > 纹荚相思(69.15%) > 木麻黄(34.59%),2种相思树种生物固氮率显著差异,但显著高于木麻黄99.88%~100.77%。(3)滨海沙地不同固氮树种生物固氮率与NRE、PRE和NRP呈负相关关系,与叶片PRP呈正相关关系。因而,滨海沙地不同固氮树种生物固氮与叶片的氮、磷重吸收存在耦合关系,并显著影响氮、磷重吸收效率和重吸收度。研究结果为揭示滨海沙地不同固氮树种对贫瘠土壤和季节性干旱的适应机制提供依据,也为滨海沙地营林管理提供参考。
英文摘要:
      Nitrogen and phosphorus deficiencies and seasonal drought are major problems of plantations in coastal sandy land of Fujian. Nutrient resorption can reduce dependence of plants on soil nutrients supply, thereby enhancing their ability to adapt to adversity. Casuarina equisetifolia, Acacia cunninghamia and A.aulacocarpa artificial plantations in the coastal sandy land of Fuzhou city were taken as objects, and nitrogen and phosphorus concentrations and stable nitrogen isotope abundance values (δ15N) in leaves at different ages (mature leaves and senescent leaves) were determined. The nitrogen and phosphorus resorption efficiencies of leaves (NRE, PRE), resorption proficiency (NRP, PRP) and their relationship with biological nitrogen fixation rates were studied by statistical methods. The results showed that (1) the NRE of leaves of different nitrogen fixing tree species in the coastal sandy land was sequenced as A.aulacocarpa (52.80%) > A.cunninghamia (28.27%) > C.equisetifolia (24.63%). The leaf NRE of A.aulacocarpa was significantly higher than those of A.cunninghamia and C.equisetifolia, but there was no significant difference between the latter two species. The PRE of leaves followed the order of A.cunninghamia (74.08%) > A.aulacocarpa (63.99%) > C.equisetifolia (40.47%), and there was significant difference among them. (2) The biological nitrogen fixation rates of different nitrogen fixing trees in coastal sandy land listed in the order of A.cunninghamia (69.45%) > A.aulacocarpa (69.15%) > C.equisetifolia (34.59%). There was no significant difference in nitrogen fixation rate between the two Acacia species, however, the biological nitrogen fixation rate of the two Acacia species was significantly higher than that of C.equisetifolia by 99.88%~100.77%. (3) The biological nitrogen fixation rates of different nitrogen fixing trees was negatively correlated with NRE, PRE and NRP, and positively correlated with PRP. Therefore, there was a coupling relationship between nutrient resorption and biological nitrogen fixation (BNF) in different nitrogen fixing tree species in the coastal sandy land, and BNF significantly affected NRE, PRE, NRP and PRP. The results would provide a basis for revealing the adaptation mechanism of different nitrogen fixing tree species to barren soil and seasonal drought in coastal sandy land, and also provide a reference for forest management.
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