不同桉树人工林锌元素的积累与循环比较

摘要/Abstract

摘要： 为了桉树的可持续经营，对刚果12桉、尾叶桉、窿缘桉三种桉树Zn元素的积累、循环进行比较研究。采用野外样地取样和室内分析方法进行研究，研究结果表明：刚果12桉、尾叶桉、窿缘桉三种桉树Zn元素含量平均值为：28.42、13.64、18.03 mg/kg；林分Zn元素积累量为：2.7365、1.4110、0.6139 kg/hm2。年存留量为刚果12桉＞尾叶桉＞窿缘桉；年归还量为刚果12桉＞窿缘桉＞尾叶桉；刚果12桉、尾叶桉、窿缘桉循环系数分别为0.66、0.69、0.84。尾叶桉林下有植被的林分和林下无植被的林分Zn元素的含量分别为54.37、54.73 mg/kg；林分Zn元素积累量为：1.6806、1.1732 kg/hm2；Zn元素年存留量分别为0.3360、0.2346 kg/hm2?a；年归还量分别为0.6777、0.6072 kg/hm2?a；年吸收量分别为1.2483、0.8418 kg/hm2?a；循环系数分别为0.86和0.90。研究结果表明桉树凋落物的回归，促进林下植被的生长发育，对桉树人工林Zn元素的动态平衡起着重要的作用。

关键词: 苜蓿, 苜蓿, 超重力, 盐胁迫

Abstract: To achieve the sustainable managements of Eucalyptus, comparison on the accumulation and cycle of Zn was made among Eucalyptus.ABL12, E.urophylla and E.exserta with field sampling and data analysis methods. Results show that average contents of Zn in Eucalyptus.ABL12, E.urophylla and E.exserta plantations are 28.42 mg/kg,13.64 mg/kg and 18.03 mg/kg respectively, and accumulations of Zn in the three forests are 2.7365 kg/hm2,1.4110 kg/hm2 and 0.6139 kg/hm2 respectively. Annual retention of Zn is in sequence of E.ABL12＞E.urophylla＞E.exserta, and annual restitution is in sequence of E.ABL12＞E.exserta＞E.urophylla. The cycling coefficient of Zn in E. ABL12, E. urophylla and E. exserta was 0.66, 0.69 and 0.84 respectively. There are some differences between Eucalyptus urophylla forest with understory vegetation and the one without understory vegetation,for examples, contents, accumulation, annual retention, annual restitution, annual absorption and recycling coefficient of Zn are 54.37 mg/kg, 1.6806 kg/ hm2?a, 0.3360 kg/hm2?a, 0.6777 kg/hm2?a,1.2483 kg/hm2?a and 0.86 in the former respectively, while 54.73 mg/kg, 1.1732kg/ hm2?a, 0.2346 kg/hm2?a, 0.6072 kg/hm2?a, 0.8418 kg/hm2?a and 0.90 in the latter respectively. Conclusions can be made that litters makes a difference in development of understory vegetation and maintaining the dynamic balance of Zn in Eucalyptus forest.

中图分类号:

S158.3

李东海,杨小波,吴庆书. 不同桉树人工林锌元素的积累与循环比较[J]. 中国农学通报, 2007, 23(7): 552-552.

Li Donghai, Yang Xiaobo, Wu Qingshu. A Comparative Study on Zn Accumulation and Cycle in Different Eucalyptus Plantations[J]. Chinese Agricultural Science Bulletin, 2007, 23(7): 552-552.

参考文献

[1] 钟继洪,李淑仪,蓝佩玲,等.刚果桉人工林营养元素生物循环研究[J].水土保持学报,2004,18(6):45-48.
[2] 谢贤健,张健,冯茂松.巨桉主要养分元素积累与分布研究[J].四川林业科技,2005,26(2):1-6.
[3] 余雪标,白先权,徐大平,等.不同连栽代次按树人工林的养分循环[J].热带作物学报,1999,20(3):60-66.
[4] 林德喜,刘开汉,罗水发.尾叶桉营养元素动态和循环分析[J].应用与环境生物学报,2002,8(2):148-153.
[5] 张金文.尾叶桉养分循环研究[J].西南林学院学报,2000,20(1):3-7.
[6] 徐大平,曾育田,李伟雄.尾叶按幼林地上部分生物量及养分循环的研究[J].林业科学研究,1994,7(6):600-605.
[7] 廖观荣,钟继洪,李淑仪,等.桉树人工林生态系统养分循环和平衡研究Ⅲ[J].桉树人工林生态系统的养分循环[J].生态环境,2003,12(3):300-302.
[8] 李跃林,李志辉,谢耀坚.巨尾桉人工林养分循环研究[J].生态学报,2001,21(10):1734-1740.
[9] 潘瑞炽,董愚得编.植物生理学[M].第三版.北京:高等教育出版社,1995.32-40.
[10] 黄月琼.尾叶桉各组分生物量估测模型的研究[J].安徽农业大学学报,2001,28(1):44-48.
[11] 余雪标,徐大平,龙腾.连栽桉树人工林生物量及生产力结构的研究[J].华南热带农业大学学报,1999,5(2):10-17.
[12] 莫大伦.海南岛植物元素背景值的初步研究[J].农业环境保护,1987,6(2):5-10.
[13] 王云.土壤环境元素化学[M].中国环境出版社,1995:101-127.
[14] 方晰,田大伦,项文化等.第2代杉木人工林微量元素的积累、分配及其生物循环特征[J].生态学报,2003,23(7):1313-1320.
[15] 李东海,杨小波,邓运武,等.桉树人工林林下植被、地面覆盖物与土壤物理性质的关系[J].生态学杂志,2006,25(6):607-611.
[16] 杨小波,李东海,李跃烈.桉树人工林土壤环境对植物种子发芽和生长的影响[J].林业科学,2006,42(12):148-153.