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一个年龄序列巨桉人工林土壤对赤子爱胜蚓生长和生理指标的影响

余俊里,张健,汤智群,王春子,钱丽芝,张丹桔*   

  1. (四川农业大学生态林业研究所, 林业生态工程省级重点实验室, 成都 611130)
  • 出版日期:2017-01-10 发布日期:2017-01-10

Variations of growth and physiological indicators of Eisenia foetida in soils across a chronosequence of Eucalyptus grandis plantations.

YU Jun-li, ZHANG Jian, TANG Zhi-qun, WANG Chun-zi, QIAN Li-zhi, ZHANG Dan-ju*#br#   

  1. (Institute of Ecology and Forestry, Key Laboratory of Ecological Forestry Engineering in Sichuan Province, Sichuan Agricultural University, Chengdu 611130, China).
  • Online:2017-01-10 Published:2017-01-10

摘要: 以四川省退耕还林营造的一个年龄序列巨桉人工林(2、4、6、8和10年生)为对象,研究其林下土壤对赤子爱胜蚓生长及生理指标的化感作用。结果表明:巨桉人工林林下土壤处理下蚯蚓存活率随林龄和处理时间均无显著变化;各林龄巨桉人工林林下土壤处理下对蚯蚓体重的抑制作用随着处理时间增加而增强,但6年生林下土壤对蚯蚓的体重抑制率呈现7~14 d上升此后下降的趋势。随着林龄的增长,在第7和14天时蚯蚓体重抑制率呈先上升(2~6年生)后下降(6~10年生)的变化趋势,而在第21和28天时蚯蚓体重抑制率随林龄无显著变化;随着林龄的增长,巨桉人工林林下土壤处理赤子爱胜蚓没有显著的回避行为。处理第28天后,蚯蚓体内蛋白质含量和AChE活性在2~8年生林下土壤无显著变化,10年生时显著升高;SOD活性在4、10年生比其他林龄显著降低,其余各林龄无显著差异;GST活性总体呈现上升趋势,6~8年生时上升显著,其余林龄则较为稳定;MDA含量在2~4年生时较为稳定,6年生时显著上升,之后又较为稳定的趋势。

关键词: 干湿交替, 潮汐, 净生态系统CO2交换, 盐沼湿地

Abstract: Allelopathy is regarded as one of the main mechanisms for the ecological problems of Eucalyptus plantations. In the present study, a chronosequence of Eucalyptus grandis plantations (2, 4, 6, 8, 10 years old) in Danling County, Sichuan Province was selected to evaluate the allelopathic effects of soils on earthworm. The growth indicators (growth rate, survival rate) and physiological indicators (protein, superoxide dismutase (SOD), acetylcholinesterase (AChE), glutathione Stransferase (GST), malondialdehyde (MDA)) of Eisenia foetida were measured in the soils from various aged E. grandis plantations. The survival rate of E. fetida did not change significantly with the plantation age and exposure time. The weight inhibition of E. foetida increased ignificantly with exposure time, whereas the weight inhibition rate increased at 7-14th day and then decreased with exposure time. At the exposure time of 7th and 14th day, the weight inhibition rate increased firstly (2-6 years old) and then decreased (6-10 years old); however, the weight inhibition rate had no significant changes with plantation age at the 21th and 28th days of exposure. E. foetida represented no significant avoidance responses with the increasing E. grandis plantation age. After the exposure time of 28 days, there were no significant effects on the protein content and AChE activity under the treatments of soils from 2-8 years old E. grandis plantations and then increased with plantation age. SOD activity of E. foetida decreased significantly in the soils of 4 and 10 years old stands, but was stable in other treatments. Overall, GST activity increased significantly with plantation age, especially for 6-8 years old stands, and was stable for other aged plantations. MDA content was stable in the soil of 2-4 years old stands, increased significantly in the soil of 6 years old stand and then was stable with increasing E. grandis plantation age.

Key words: tidal action, net ecosystem CO2 exchange, drying and wetting cycle, salt marsh.