香樟凋落叶分解对几种园地作物抗性生理和土壤氮组分的影响

发布时间：2018-01-24 23:29

  本文关键词： 香樟 凋落叶分解 抗性生理 氮组分 化感作用　出处：《南京林业大学学报(自然科学版)》2017年03期 　论文类型：期刊论文

【摘要】：【目的】探讨香樟(Cinnamomum camphora)凋落叶添加到土壤中对小白菜(Brassica chinensis)、莴笋(Lactuca sativa)、茄子(Solanum melongena)生长和抗性生理的影响以及土壤矿质化氮的动态响应。【方法】采用盆栽试验,以单位面积香樟叶年凋落量作为凋落叶的基本添加量,设不添加凋落叶的对照(CK)和3个凋落叶添加水平,即A_1(25 g/盆)、A_2(50 g/盆)、A_3(100 g/盆),每处理重复5次,处理3种作物共计60盆。处理后,定期对植株生长指标(株高、地径)和抗性生理指标(超氧化物歧化酶、过氧化氢酶、过氧化物酶)和作物所生长土壤的硝态氮、铵态氮含量进行测定。【结果】香樟凋落叶分解对3种作物的地径、株高均有明显的抑制作用,且有随凋落叶添加量的增加而增强并随分解时间的延长而逐渐减弱的效应;香樟凋落叶分解初期(20~40 d),各水平处理均显著地促进了叶片超氧化物歧化酶(SOD)和过氧化氢酶(CAT)活性,抑制了过氧化物酶(POD)活性。凋落叶分解到80 d时,各处理CAT、POD、SOD活性的差异明显缩小;加入不同量的香樟凋落叶在一定时间(30~50 d)内大幅降低了土壤矿化氮(硝态氮和铵态氮)含量;不同作物对香樟凋落叶化感作用的敏感程度不同,莴笋最为敏感,其次是小白菜,茄子的耐受性最强,相对更适宜在香樟林间或林缘种植。【结论】香樟凋落叶分解可能降低了土壤氮素的有效性,并对作物造成活性氧伤害,最终限制其生长发育。
[Abstract]:[objective] to study the effect of Cinnamomum camphora (Cinnamomum camphora) on Brassica chinensis (Brassica chinensis). Lactuca sativa. Effects of Solanum melongena on growth and resistance physiology and dynamic response of soil mineralized nitrogen. [methods] pot experiment was carried out. The annual litter amount per unit area of Cinnamomum camphora was taken as the basic addition amount of littered leaves, CK) and 3 littered leaf supplementation levels were set up, namely, A1m25 g / pot). The annual litter amount of Cinnamomum camphora L. per unit area was used as the basic addition amount of littered leaves. Each treatment was repeated five times, and the three crops were treated in 60 basins. After treatment, the plant growth index (plant height) was regularly analyzed. Ground diameter), resistance physiological indexes (superoxide dismutase, catalase, peroxidase) and nitrate nitrogen in soil grown by crops. [results] decomposition of littered leaves of Cinnamomum camphora had a significant inhibitory effect on ground diameter and plant height of three crops. The effect was increased with the increase of leaf litter addition and weakened with the prolongation of decomposition time. The activity of superoxide dismutase (SOD) and catalase catalase (CAT) in leaves of Cinnamomum camphora L. The activity of peroxidase POD) was inhibited. The difference of SOD activity between different treatments decreased obviously when the leaves were decomposed to 80 days. The content of soil mineralized nitrogen (nitrate nitrogen and ammonium nitrogen) was significantly decreased by adding different amount of camphora camphora leaves in a certain period of 30 ~ 50 days. The sensitivity of different crops to the allelopathy of Cinnamomum camphora was different. Lettuce was the most sensitive, followed by pakchoi, and eggplant had the strongest tolerance. Conclusion the decomposition of littered leaves of Cinnamomum camphora may reduce the availability of soil nitrogen and cause damage to crops by reactive oxygen species, and ultimately limit the growth and development of Cinnamomum camphora.
【作者单位】： 四川农业大学林学院;内江市农业科学院;泸州市林业科学研究所;
【基金】：“十二五”国家科技支撑计划(2011BAC09B05) 四川省教育厅重点项目(13ZA0246)
【分类号】：S63;S714
【正文快照】： peroxidase(POD)was increased.After 80 d of decomposition,the activity difference of CAT,SOD and POD were significant-ly decreased.Different addition during a certain period(30-50 d)remarkably reduced the content of soil mineral nitrogen(nitrate nitrogen ，

本文编号：1461331