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

作　　者：刘千里[1] 徐雪梅[2] 刘兴良[3] 文智猷[3,4] 刘世荣[4] 

机构地区：[1]阿坝州科学技术研究院林科所,四川汶川623000 [2]阿坝州松潘县林业局,四川松潘623303 [3]四川省林业科学研究院,四川成都610081 [4]中国林业科学研究院,北京100091

出　　处：《四川林业科技》2012年第3期1-6,共6页Journal of Sichuan Forestry Science and Technology

基　　金：国家林业公益性行业专项(201104109);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

摘　　要：本文通过对卧龙自然保护区不同海拔分布梯度上的川滇高山栎不同年龄叶片营养元素含量的研究表明:(1)当年生叶营养元素含量大小排序为N>K>Ca>P>Mg,分别为1.45%、0.75%、0.49%、0.17%和0.13%;N、P含量随海拔呈现先下降后升高的趋势,即在海拔2 400 m和2 800 m较低;K含量随海拔升高而升高;Ca、Mg含量随海拔升高而降低。(2)老叶营养元素含量大小排序为N>Ca>K>P>Mg,分别为1.08%、0.79%、0.40%、0.16%和0.11%;N含量随海拔升高而升高;P、K、Ca、Mg含量呈现先升高后下降的趋势,即在海拔2 400 m和2 800 m较高。(3)N、K、Mg含量呈现当年生叶比老叶高的趋势;P含量除2 600 m以外,老叶的含量比1年生叶低;Ca含量在海拔2 400 m以上出现老叶比1年生叶高,海拔2 000 m为1年生叶比老叶高;(4)N/P比值,当年生叶范围在7.83～9.50,随着海拔的升高而降低;老叶范围在5.25～9.00,具有随着海拔的升高先下降后升高的趋趋势。C/N比值,当年生叶范围在31.91～40.18,老叶范围在44.34～56.04,总趋势为随着海拔的升高而降低。P/K比值,当年生叶范围在0.20～0.28,老叶范围在0.31～0.48;当年生叶随着海拔升高呈现先降低后升高的趋势;老叶随着海拔升高呈现先升高后降低的趋势。K/Ca比值,当年生叶范围在0.83～3.91,老叶范围在0.39～0.65;当年生叶随着海拔的升高而增大,老叶随着海拔升高呈现先升高后降低的趋势。K/Mg比值,当年生叶范围在3.56～10.75,老叶范围在2.50～6.00,总趋势为随着海拔的升高而增大。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

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 

分 类 号：S792.18[农业科学—林木遗传育种]