不同林龄短枝木麻黄小枝单宁含量及养分再吸收动态  

Dynamics of tannin concentration and nutrient resorption for branchlets of Casuarina equisetifolia plantations at different ages

作　　者：叶功富[1] 张尚炬[2] 张立华[3] 卢昌义[4] 林益明[4] 

机构地区：[1]福建省林业科学研究院,福州350012 [2]福建省平潭国有防护林场,平潭350400 [3]中国科学院烟台海岸带研究所,烟台264003 [4]厦门大学环境与生态学院,厦门361005

出　　处：《生态学报》2013年第19期6107-6113,共7页Acta Ecologica Sinica

基　　金：国家自然科学基金项目(41201293;41176092);国家"十一五"科技支撑计划项目(2009BADB2B0302);国家林业局南方山地用材林培育重点实验室和福建省森林培育与林产品加工利用重点实验室资助项目

摘　　要：通过对福建省惠安县不同林龄短枝木麻黄人工林不同发育阶段小枝单宁含量及氮磷再吸收率的研究,探讨了短枝木麻黄林分发育过程中的营养保存策略。结果表明,幼龄林(5年生)成熟小枝中的总酚(TP)、可溶性缩合单宁(ECT)总缩合单宁(TCT)含量及蛋白质结合能力(PPC)显著高于成熟林(21年生)和衰老林(38年生)。随着林分发育,成熟小枝中N含量显著升高,而P含量呈降低趋势。不同发育阶段林分成熟小枝中N∶P比均大于20,且随着林龄的增加而升高。磷再吸收率(PRE)显著高于氮再吸收率(NRE),均以成熟林分最高。这表明短枝木麻黄小枝单宁含量与养分再吸收受林龄影响,其养分保存机制会随着林分生长发育的变化而进行调节。Casuarina equisetifolia is characterised by high primary productivity in coastal sandy soils, which are generally low in nutrient contents. High tannin production and nutrient resorption may be important strategies for C. equisetifolia in coastal environments. Despite the widespread planting and known ecological and physiological properties of C. equisetifolia, there is scant information about the nutrient resorption patterns and tannin concentrations for branchlets of C. equisetifolia plantations during stand development. Since plant ecophysological traits are associated with ageing, tannin content and nutrient resorption efficiency could change with stand development. Therefore, tannin level and nutrient resorption of C. equisetifolia at different developmental phases （juvenile, mature and senescent） were examined to evaluate possible nutrient conservation strategies under nutrient limitation in Huian County,Fujian Province. The results showed that total phenolics （TP） contents, which were in the order juvenile stand 〉 senescent stand 〉 mature stand for senescent branchlets and decreased from 218.52 to 180.49 mg/g during stand development for mature branchlets, decreased during branchlet senescence in all stands. The extractable condensed tannin contents （ECT） in mature and senescent branchlets of C. equisetifolia were juvenile stand 〉 senescent stand 〉 mature stand. The ECT contents of C. equisetifolia increased during branchlet senescence both in the mature and senescent stands but decreased in the juvenile stand. The protein-bound condensed tannin （PBCT） contents of branchlets increased during senescence in juvenile and mature stands and remained the same in senescent stand. The fibre-bound condensed tannins （FBCT） of branchlets increased during senescence in mature stand and did not change in juvenile and senescent stands. Total condensed tannin （TCT） followed similar pattern as ECT during stand development. Protein precipitation capacity （PPC） in mature and senescent bra

关 键 词：短枝木麻黄 单宁 养分再吸收 林分发育 

分 类 号：S792.93[农业科学—林木遗传育种]