福建东山短枝木麻黄小枝氮磷含量及其再吸收率季节动态  

Seasonal dynamics of nitrogen and phosphorus concentrations,and nutrient resorption efficiencies of Casuarina equisetifolia branchlets in Dongshan County,Fujian

作　　者：叶功富[1] 张立华[1] 林益明[2] 王亨[3] 周海超[2] 曾琦[2] 

机构地区：[1]福建省林业科学研究院,福州350012 [2]厦门大学生命科学学院,厦门361005 [3]福建农林大学林学院,福州350002

出　　处：《生态学报》2009年第12期6519-6526,共8页Acta Ecologica Sinica

基　　金：国家"十一五"科技支撑计划资助项目(2006BAD03A14-01);福建省科技重大资助项目(2006NZ0001-2);国家林业局南方山地用材林培育重点实验室资助项目

摘　　要：对福建东山赤山林场短枝木麻黄纯林小枝中的N和P含量、N∶P比、养分再吸收率的季节动态进行研究。结果表明,随着小枝的成熟和衰老,各季节N和P的含量依次降低,其中衰老小枝中N和P含量分别为(3.97±0.21)～(8.64±0.58)mg·g-1和(0.04±0.03)～(0.10±0.03)mg·g-1,基本上表现为N和P的完全再吸收。成熟小枝N∶P比的季节动态介于(18.67±3.24)～(37.98±1.32)之间,均高于16,表明木麻黄的生长受到不同程度的P限制。N、P再吸收率的季节变化分别为(51.02±4.66)%～(63.00±8.61)%和(81.24±5.08)%～(91.78±5.84)%,P再吸收率显著高于N。N和P的再吸收率之间以及成熟叶中N、P含量与二者再吸收率之间没有显著相关性,但在衰老叶中存在显著负相关,表明养分再吸收程度越高,其再吸收率就越高。因此,木麻黄通过小枝衰老过程中的养分再吸收,减少养分的损失,从而适应贫瘠的立地条件。Seasonal dynamics of nitrogen and phosphorus concentrations,N∶P ratios and nutrient resorption efficiency of Casuarina equisetifolia branchlets was studied at Chishan Forestry Center of Dongshan County,Fujian Province,China. The results showed that N and P concentrations were highest in young branchlets and decreased with maturity and senescence. N and P concentrations of senescent branchlets ranged from （3.97±0.21） to （8.64±0.58） mg g-1 and （0.04±0.03） to （0.10±0.03） mg g-1,respectively. N∶P ratios of mature branchlets （（18.67±3.24）37.98±1.32） were all above 16 through the year,showing P was more limiting than N. Nitrogen resorption efficiency （REN） and phosphorus resorption efficiency （REP） were from （51.02±4.66）% to （63.00±8.61）% and from （81.24±5.08）% to （91.78±5.84）% through the year,respectively,and REP was significantly higher than REN. There is no significant correlation between REN and REP. REN is not correlated with either N concentration or N：P ratios in mature branchlets,no correlation was also found between REP and either P concentration or N∶P ratios in mature branchlets. While the significant negative correlation was observed in senescent branchlets.

关 键 词：短枝木麻黄 氮 磷 养分再吸收率 养分再吸收程度 

分 类 号：S792.99[农业科学—林木遗传育种]