YANG Dan,YANG Liudeng,YANG Xiuquan,et al.Effects of Municipal Sewage Sludge Application on Photosynthetic and Growth Characteristics of Pennisetum alopecuroides Seedlings[J].Northern Horticulture,2022,(19):61-68.[doi:10.11937/bfyy.20220851]
城市污泥施用对杂交狼尾草幼苗光合及生长特性的影响
- Title:
- Effects of Municipal Sewage Sludge Application on Photosynthetic and Growth Characteristics of Pennisetum alopecuroides Seedlings
- Keywords:
- municipal sewage sludge; soil fertility; heavy-metal; plant growth; photosynthetic characteristics
- 文献标志码:
- A
- 摘要:
- 以城市污水污泥和石漠化地区土壤为试材，采用室内盆栽试验方法，将污泥以不同比例施入石漠化土壤并种植杂交狼尾草，研究了污泥添加对杂交狼尾草苗期光合作用及生长的影响，以期为城市污泥的资源化利用途径提供参考依据。结果表明：随着污泥添加比例的提高，土壤有机质、全氮、全磷、有效氮、有效磷等营养物质显著增加，但同时重金属含量也增加，污泥添加比例为50%~75%时，混合基质中Cd、Zn含量超过《土壤环境质量 农用地土壤污染风险管控标准(试行)(GB15618-2018)》。20%~35%污泥添加条件下，杂交狼尾草的蒸腾速率、气孔导度、净光合速率、水分利用率随着杂交狼尾草生长时间均增加，50%~75%污泥添加条件下，上述指标的增长速度则显著下降，高比例污泥添加条件下杂交狼尾草的光合特性受到抑制，从而影响其生长。因此，高比例的污泥施用可能带来一定程度的土壤重金属污染，抑制植物光合能力，影响植物生长；利用城市污泥提高石漠化土壤肥力需控制好施用比例，以不超过50%为宜。
- Abstract:
- Municipal sewage sludge (MSS) and soil collected in rocky desertification area were used as test materials and indoor pot experiment method was adopted，in which MSS was applied to soil with different proportions，and Pennisetum alopecuroides was planted.The effect of MSS addition on photosynthesis and growth of Pennisetum alopecuroides seedlings was analyzed，in order to provide reference for the resource utilization of municipal sewage sludge.The results showed that the content of soil organic matter，total nitrogen，total phosphorus，available nitrogen and available phosphorus increased significantly，and the content of heavy metals also increased with the increase of MSS addition ratio.When adding 50%-75% MSS，the contents of Cd and Zn in the mixed matrix exceeded the standard of Soil Environmental Quality-pollution Risk Control Standard of Agricultural Land (Trial) (GB15618-2018).When adding 20%-35% MSS，the transpiration rate，stomatal conductivity，net photosynthetic rate and water use efficiency of Pennisetum alopecuroides seedlings increased with the growth time，but these indicators significantly decreased in 50%-75% MSS addition treatments.The photosynthetic characteristics of Pennisetum alopecuroides seedlings were inhibited and its growth was affected on condition of high proportion of MSS application.Therefore，high proportion of MSS application might lead to soil heavy metal contamination，inhibit plant photosynthetic capacity and affect plant growth.To improve the fertility of soil in rocky desertification areas by MSS application，the proportion should be controlled well，and it should be no more than 50%.
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备注/Memo
第一作者简介：杨丹（1982-），女，博士，副教授，现主要从事土壤环境质量评价与污染防治等研究工作。E-mail：yangdansky@163.com.基金项目：贵州省教育厅科技拔尖人才支持计划资助项目（黔教合KY字[2018]063）；国家自然科学基金资助项目（31600442）；2018年度贵州省高层次创新型人才贵阳市培养对象支持资助项目（2020）；2022年度贵阳学院学科团队建设资助项目（2022-xk06）。收稿日期：2022-03-08