四川林业科技2012，Vol.33Issue(3)：1-6,6.
卧龙巴郎山川滇高山栎叶片营养元素的海拔梯度变化特征
Characteristics of Macronutrient Variation in Leaves of Quercus aquifolioides Along with the Altitudinal Gradients on the Balangshan Mountain in Wolong Nature Reserve, China
摘要
Abstract
In this paper, investigations were made on the concentration of macronutrients （ N, P, K, Ca and Mg） in the leaves of Q. aquifolioides. The results were summarized as follows. （ 1 ） The characteristic con- tents of macronutrients in the annual leaves of Q. aquifolioides were N 〉 K 〉 Ca 〉 P 〉 Mg, and they ac- counted for 1.45% ,0. 75% ,0. 49% ,0. 17% and 0. 13% respectively;The N and P contents decreased rapidly first and then increased with the increasing elevation, namely being relatively low at the altitudes between 2 400 m and 2 800 m; Likewise, the K content increased with the increasing elevation and the Ca andMg contents decreased with the increasing elevation ; （2） The characteristic contents of macronutri-ents in aged leaves of Q. aquifolioides were N 〉 Ca 〉 K 〉 P 〉 Mg, and they accounted for I. 45%, 0. 75% ,0. 49% ,0. 17% and 0. 13% respectively;The N content increased with the increasing elevation and the P, K, Ca and Mg contents increased rapidly first and then decreased with the increasing elevation, namely, being relatively high at the altitudes between 2 400 m and 2 800 m ; （3） The N, K and Mg con- tents in the annual leaves were higher than those in aged leaves; The P content of annual leaves was lower than that of aged leaves except at the altitudes of 2 600 m ;The Ca content of aged leaves was lower than that of annual leaves at the altitudes of abive 2 400 m and the Ca content of annum leaves was higher thanthat of aged leaves at the altitudes of 2000m ; （4） As for the ratio of N/P, the range of the annual leave was 7. 83 ~ 9.50, and the figurs would shrink with the increase of the altitude ; the range of the aged leav- es was 5.25 - 9.00, beginning with the increase, subsequently decreasing; As for the ratio of C/N, the range of the annual leaves was 31.91 -40. 18 ,the range of the aged leaves was 44. 34 -56. 04 ,the over- all trend was to decrease with the increase of the altitude ; As for the ratio of P/K, the range of the annual leaves was 0. 20 -0. 28 and the range of the aged leaves was 0. 31 -0. 48. The trend of the annual leaveswas to begin with the decrease, subsequently increase with the increase of the altitude; The trend of the aged leaves was to begin with the increase, subsequently decrease with the increase of the altitude. As for the ratio of K/Ca,the range of the annual leaves was 0. 85 -3, 91 and the range of the aged leaves was 0. 39-0. 65. The trend of the annum leaves was to shoot up with the increase of the altitude ; The trend of the aged leaves was to begin with the increase, subsequently decrease with the increase of the altitude. As for the ratio of K/Mg,the range of the annual leaves was 5.56 -10. 75 ,and the range of the aged leaves was 2. 50 -6. 00. The overall trend was to increase with the increase of the altitude.关键词
川滇高山栎/叶/营养元素含量/海拔梯度/卧龙自然保护区Key words
Q. aquifolioides/Leaves/Nutrient content/Altitudinal gradient/Wolong Nature Reserve分类
农业科技引用本文复制引用
刘千里,徐雪梅,刘兴良,文智猷,刘世荣..卧龙巴郎山川滇高山栎叶片营养元素的海拔梯度变化特征[J].四川林业科技,2012,33(3):1-6,6.基金项目
国家林业公益性行业专项 （）
国家林业局四川森林生态与资源环境重点实验室开放课题 （）
森林和湿地生态恢复与保育四川省重点实验室开放课题. （）
