太行山丘陵区刺槐人工林主要养分元素分配及循环特征  

Nutrient allocation and cycling pattern in the Robinia pseudoacacia plantation in hilly region of Taihang Mountains

作　　者：赵勇[1] 樊巍[2] 吴明作[1] 张军[1] 朱彦锋[1] 

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

出　　处：《中国水土保持科学》2009年第5期111-116,124,共7页Science of Soil and Water Conservation

基　　金："十一五"国家科技支撑项目"华北土石山区植被恢复与重建技术试验示范"(2006BAD03A1102);河南省科技攻关项目"典型退化生态系统恢复;重建机理及生态工程设计示范研究"(0624090010)

摘　　要：为了解刺槐人工林养分循环特征,以太行山丘陵区刺槐人工林为研究对象,采用样地标准木收获法,对其生物量和养分循环进行研究。结果表明:1)刺槐林乔木层总生物量为39.87 t/hm2,各器官生物量排序为树干>树根>树皮>树枝>树叶,树干所占生物量比例最大,叶生物量最小。2)3种元素在各器官中含量表现出较大差异,在树干、树根和树皮中的含量大小排序是N>Ca>P,枝、叶中含量排序为Ca>N>P。3)各器官营养元素积累量、年存留量分配关系为树干>树叶>树枝>树根>树皮,林分3种营养元素积累量为633.20 kg/hm2,积累量和年存留量大小排序为Ca>N>P,Ca积累量最多(368.36 kg/hm2),P最少(18.19 kg/hm2),N居中(276.65 kg/hm2)。4)凋落物营养元素年归还量为286.52 kg/hm2,3种营养元素年归还量大小排序为Ca>N>P,Ca最高(196.48 kg/hm2),分别是N和P的2.31倍和40.26倍。5)刺槐人工林吸收系数排序为N>P>Ca,富集系数为N>P>Ca,刺槐对N吸收系数、富集系数均高于P、Ca,利用系数、循环系数排序是Ca>N>P,Ca周转时间最短(1.87 a),P最长(3.73 a),N居中(3.25 a)。The biomass and nutrient return in the Robinia pseucdoacacia plantation stand in hilly region of Taihang Mountains were investigated by means of the sample tree harvest method. The results indicate as follows： 1 ） The total biomass of tree layer was 39.87 t/hm^2. The descending order of biomass of different organs was stem, root, bark, branch, leaf. 2） The concentration of three elements in different organs showed the significant difference. The descending order of contents of three elements in stem, roots and bark was Nitrogen, Phosphors, Calcium, as for that in branch and leaf, Calcium, Nitrogen, Phosphors. 3 ） The descending order of main elements in different organs was stem, leaf, branch, root, bark. Nutrient accumulation of three elements of the stand was 633.20 kg/hm^2, The descending order of annual accumulation and retained amount is Calcium, Nitrogen, Phosphors, The accumulation of Calcium in the stands was 368.36 kg/hm^2, 18.19 kg/hm^2 for Phosphors, and 276.65 kg/hm^2 for Nitrogen. 4） The annual returned amount of three nutrient through litter was 286.52 kg/hm^2, descending order of which is Calcium, Nitrogen, Phosphors. The annual returned amount of Calcium was 196.48 kg/hm^2, that was 2.31 times more than those of Nitrogen and 40.26 times, for Phosphors. 5） The descending order of absorption and enrichment coefficients of nutrient elements in the stand is Nitrogen, Phosphors, Calcium, as for utilization and cycling coefficients, Calcium, Nitrogen, Phosphors. The turnover period of Calcium was 1.87 a, which was the shortest among three elements, while the longest one, Phosphors with 3.73 a and the middle one, Nitrogen with 3.25 a.

关 键 词：刺槐 人工林 养分元素 养分循环 太行山 

分 类 号：S792.27[农业科学—林木遗传育种] S661.101[农业科学—林学]