太行山地区侧柏人工林主要养分元素分配及循环特征  

The Nutrient Allocation and Cycling Pattern in the Platycladus orientalis Plantation in Hilly Region of Taihang Mountains

作　　者：赵勇[1] 樊巍[2] 吴明作[1] 张军[1] 朱彦峰[1] 

机构地区：[1]河南农业大学,河南郑州450002 [2]河南省林业科学研究院,河南郑州450003

出　　处：《水土保持学报》2009年第2期143-147,152,共6页Journal of Soil and Water Conservation

基　　金：国家“十一五”科技支撑项目(2006BAD03A1102);河南省科技攻关项目(0624090010);国家林业局黄河小浪底森林生态系统定位研究站基金

摘　　要：为了解侧柏(Platycladus orientalis)人工林养分循环特征,以太行山丘陵区侧柏人工林为研究对象,采用样地标准木收获法,对其生物量和养分循环进行了研究。结果表明:(1)侧柏人工林(26 a)生物量约45.55t/hm2,林分净生产力为2.07 t/hm2;生物量分配排序为:树干>树根>树皮>树枝>树叶。(2)林分营养元素积累量为455.23 kg/hm2,积累量的排序为:Ca>N>P。(3)灌草植被层营养元素积累量顺序为:Ca>N>P,灌草层3种元素总贮量仅占乔木层的5.5%。(4)凋落物营养元素年归还量为337.12 kg/hm2,3种营养元素归还量排序为:Ca>N>P,Ca的年归还量最高,为271.66 kg/hm2,分别是N和P的4.42倍和69.12倍。(5)年吸收量、年存留量、养分年归还量和富集系数排序均为Ca>N>P;吸收系数排序为Ca>N>P;利用系数、循环系数排序是N>Ca>P。侧柏对N的利用系数最大;Ca的富集能力最强,分别是N,P的1.9和2.8倍。侧柏的N周转时间最短(1.22 a),P周转时间最长(3.63 a),Ca周转时间居中(1.43 a)。The biomass and nutrient return in the Platycladus orientalis plantation stand in hilly region of Taihang Mountains were investigated by means of the standard timber harvest method. The results indicate as follows： （1） The biomass and net productivity of Platycladus orientalis plantation stands was 45. 55 t/hm^2 and 2. 07 t/hm^2, respectively. The order of distribution of the biomass was stem 〉 roots〉 bark〉 branch〉leaf. （2） The nutrient accumulation of three elements in the stand was 455.23 kg/hm^2 , the annual accumulation ranked as calcium〉 nitrogen〉phosphors. （3） The nutrient accumulation of three elements in the shrub and grass layer of the stands was ranked as calcium〉nitrogen〉phosphors, which accounts for 5.5% of that in the tree layer. （4） The amount of the annual returned of three elements was 337.12 kg/hm^2 , which was in order of calcium〉nitrogen〉phosphors. The annual returned amount of calcium was 271.66 kg/hm^2, that was 4.42times more than those of nitrogen and 69.12 times, for phosphors. （5） The annual enrichment and absorption coefficient in the stand was ranked as calcium〉nitrogen〉phosphors, as for the utilization ,cycling coefficient nitrogen〉calcium〉phosphors. The utilization coefficient of the nitrogen in the stands was the highest. The enrichment ability of calcium was 1.9 times more than those of nitrogen and 2.8 times ,for phosphors. The turnover period of Nitrogen was 1.22 a, which was the shortest among three elements, while the longest one, phosphors with 3.63 a and the middle one, nitrogen with 1.43 a.

关 键 词：侧柏 人工林 养分元素 养分循环 太行山 

分 类 号：Q948[生物学—植物学]