摘要
【目的】深入了解毛竹凋落物在不同铅污染环境中的分解机制。【方法】通过外源铅污染添加试验,采用凋落物分解袋法研究了毛竹凋落物质量损失、凋落物呼吸、真菌生物量和酶活性分解对重度(2 000mg·m-2)、中度(1 000mg·m-2)、轻度(500mg·m-2)铅污染的短期(60d)响应。【结果】在60d的分解期内施加外源铅整体抑制了毛竹凋落叶的分解,中度和重度铅污染处理组凋落叶质量存留率高于其他组;在分解期的前40d,施加外源铅对毛竹凋落叶的二氧化碳释放量和菌丝量总体起抑制作用;在分解过程进行60d后,外源铅污染铅促使了毛竹凋落叶二氧化碳释放量和菌丝生物量的增加;在60d的分解期内,不同程度的铅污染均整体抑制了纤维素酶和漆酶活性,但对淀粉酶活性的增加稍有促进作用。【结论】重金属铅对毛竹凋落物分解产生了明显负面影响,这为理解重金属矿区附近植被凋落物的分解机制提供了参考。
[Purposes]The aim of the present study was to study the decomposition mechanism of litter fall in Phyllostachy spubescens by different lead pollution.[Methods]The field experiment were carried out by using litter bags method in the short term（60 days）.The effects of exogenous lead pollution were studied,including 2 000,1 000,500 mg·m（-2） concentration on the loss of litters,the release of carbon dioxide,fungal biomass and enzymatic activity.[Findings]In the decomposition period of decomposition of 60 days,the exogenous lead was inhibited the decomposition of litter leaves,when the concentration of lead was moderate and high,the dry weight of P.pubescens leaves was higher than other groups.The effect of exogenous lead on the release of carbon dioxide and the fungal biomass of P.pubescens leaves at 40 days before decomposition were overall inhibition,but at 60 days,high group promoted the release of carbon dioxideof P.pubescens but reduced the fungal biomass.In the decomposition period of 60 days,the results of enzyme activity test showed that the different levels of lead pollution inhibited the cellulase and laccase activity as a whole,but had a positive effect on amylase activity.[Conclusions]In conclusion,heavy metal lead had a negative effect on the litter decomposition of P.pubescens,which may provide a theoretical basis for the future study on the decomposition of litter in the vicinity of heavy metal mining area.
出处
《重庆师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2018年第1期117-123,共7页
Journal of Chongqing Normal University:Natural Science
基金
国家自然科学基金(No.31360135
No.31560205
No.41501335
No.31670624)
湖南省战略性新兴产业科技攻关项目(No.2014GK1062)
湖南省研究生科研创新项目(No.CX2017B720)
关键词
铅
毛竹凋落物
质量存留率
负面影响
lead
Phyllostachys pubescens leaf litter
the loss of litterfall
negative effect
