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不同水力负荷渗滤液对植物土壤系统的影响
引用本文:王如意,何品晶,邵立明,袁莉,李国建.不同水力负荷渗滤液对植物土壤系统的影响[J].环境科学,2006,27(5):950-955.
作者姓名:王如意  何品晶  邵立明  袁莉  李国建
作者单位:同济大学污染控制与资源化研究国家重点实验室,上海,200092
基金项目:国家高技术研究发展计划(863)项目(2001AA644010,2003AA644020,2005AA644010)
摘    要:以稳定产甲烷阶段垃圾层循环回灌处理后的渗滤液、轻壤土和百慕大草(Cynodon dactylon)为实验材料,比较了不同水力负荷渗滤液对植物-土壤系统的生态影响.结果表明,2.77~12.00 mm·d-1渗滤液灌溉组土壤的几种关键酶活性、呼吸作用强度、土壤微生物量、微生物商,叶绿素含量均较对照组高,丙二醛(MDA)、过氧化氢(H2O2)、脯氨酸(Pro)含量较低;在渗滤液灌溉组间,6.46~10.15 mm·d-1渗滤液灌溉下百慕大草Pro含量下降显著,叶绿素含量明显提高,过氧化物酶(POD)活性、MDA和H2O2含量较低,土壤酶活性显著提高、呼吸作用强度、微生物量和微生物商较大;而当渗滤液水力负荷过低(2.77~4.16 mm·d-1)或过高(12.00 mm·d-1)时百慕大草胁迫会加重、土壤生物活性下降.表明适量渗滤液灌溉可减缓环境对百慕大草的胁迫,提高土壤的生物活性,表现出对植物-土壤系统的生态正效应,其原因可能与不同水力负荷渗滤液灌溉改变了土壤的水分和理化性质.研究说明,通过控制渗滤液原液水力负荷,可望获得渗滤液灌溉对植物-土壤系统最佳的生态效应.

关 键 词:渗滤液  水力负荷  植物-土壤系统  生态效应
文章编号:0250-3301(2006)05-0950-06
收稿时间:6/4/2005 12:00:00 AM
修稿时间:2005-06-142005-09-27

Ecological Effect of Recirculated Landfill Leachate with Different Hydraulic Loading on Plant-Soil System
WANG Ru-yi,HE Pin-jing,SHAO Li-ming,YUAN Li and LI Guo-jian.Ecological Effect of Recirculated Landfill Leachate with Different Hydraulic Loading on Plant-Soil System[J].Chinese Journal of Environmental Science,2006,27(5):950-955.
Authors:WANG Ru-yi  HE Pin-jing  SHAO Li-ming  YUAN Li and LI Guo-jian
Institution:State key laboratory of pollution control and resource reuse, Tongji University, Shanghai 200092, China. solidwaste@mail.tongji.edu.cn
Abstract:The ecological effect of irrigating recirculated leachate with different hydraulic loading on bermudagrass (Cynodon dactylon) and soil system was evaluated. The results show that leachate irrigation with hydraulic loading of 2.77-12.00 mm d(-1) leads to high chlorophyll content, low proline (Pro) content, as well as low malondialdehyde (MDA) and H2O2 content. Soil enzyme activities, respirations, microbial biomass and ratio of biomass carbon to organic carbon (Cmic/Corg) are rather higher. Among leachte irrigation group, leachate irrigation with hydraulic loading of 6.46-10.15 mm x d(-1) leads to declined proline, increased chlorophyll content, low POD activity and low content of MDA and H2O2. Soil bio-activity related parameters, such as soil enzyme activities, respirations, microbial biomass and Cmic/Corg are all enhanced at 6.46-10.15 mm x d(-1) of hydraulic loading. However, when hydraulic loading increases to 12.00 mm x d(-1) or declines to 2.77-4.16 mm x d(-1), the stress of irrigation on bermudagrass is aggravated, and soil bioactivity declines. The results reveal that leachate irrigation could alleviate the stress of environment on bermudagrass and improve the bio-activity of soil. The positive effect of leachate irrigation on the plant-soil system might be contributed to changes of soil water and physico-chemical property after leachate irrigated to the soil. The experimental results suggest that leachate irrigation could benefit plant-soil system, especially when controlled at suitable hydraulic loading.
Keywords:recirculated landfill leachate  hydraulic loading  plant-soil system  ecological effect
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