Cyclic utilization of sludge and flyash to improve the soil quality in karst rocky desert
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摘要: 本文通过在石漠化土壤中添加不同配比的城市污泥—粉煤灰混合物,研究其对石漠化区域土壤理化性质、持水性能,及在该石漠化土壤上所种植的高羊茅生长和重金属积累的影响。结果表明:施用粉煤灰能显著降低污泥Cu、Mn、Zn和Cd等重金属的含量并使土壤的pH得到提高,明显改善土壤的理化性质;土壤饱和含水率比对照提高1.95倍,持水时间提高7d左右,能增加土壤的N、P养分,并显著提高高羊茅的生物量,不失为促进石漠化地区生态恢复治理的一种有效方法。但由于重金属在环境中半衰期长、彻底清除难和生态毒害大等特点,不宜长期反复施用富含重金属的城市污泥。Abstract: Soil in karst rocky desert is applied with sludge-flyash composites of different sludge to flyash proportion in this experiment, and the effects of sludge-flyash composites on soil physicochemical properties, water-holding capacity and heavy metal accumulation in Festuca arundinacea are studied accordingly. The results show that the heavy metal contents like Cu, Mn, Zn and Cd in the sludge are remarkably decreased, the soil pH enhanced to about 7 and the soil physicochemical properties improved obviously after applying flyash; and that the soil water-saturation coefficients is enhanced by 1.95 times, the time of water retention elongated about 7d, the soil N, P increased and the biomass of Festuca arundinacea is also enhanced remarkably. So, it can yet be regarded as an effective method to ecologic rehabilitation for karst rocky desert. But it is not suitable to apply sludge repeatedly for the half-life period of the heavy metals in the sludge is long and the heavy metals are difficult to be thoroughly eliminated, and the heavy metals themselves are of serious eco-toxicity.
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[1] 郭柯,刘长成,董鸣.我国西南喀斯特植物生态适应性与石漠化治理［J］.植物生态学报,2011,35(10):991-999. [2] 中国科学院学部.关于推进西南岩溶地区石漠化综合治理的若干建议［J］.地球科学进展,2003,18(4):389-492. [3] 李阳兵,王世杰,王济.岩溶生态系统的土壤特性及其今后研究方向［J］.中国岩溶,2006,25(4):285-289. [4] 白晓永,熊康宁,苏孝良,等.喀斯特石漠化景观及其土地的生态效应［J］.中国岩溶,2005,24(4):276-281. [5] 蒋忠诚,曹建华,杨德生,等.西南岩溶石漠化区水土流失现状与综合防治对策［J］.中国水土保持科学,2008,6(1):37-42. [6] 苏德纯,黄焕忠.粉煤灰钝化污泥人工土壤上高麦草生长发育及营养状况研究［J］.应用与环境生物学报,1997,3(3):230-235. [7] 霍晓君,李祯,李胜荣,等.粉煤灰和城市污泥配施改良荒漠土壤的持水性影响研究［J］.干旱区资源与环境,2005,19(6):168-172. [8] 占新华,周立祥,黄焕忠.城市污泥堆肥中水溶性有机物的理化特性变化［J］.中国环境科学［J］,2003,23(4):390-394. [9] 申俊峰,李胜荣,孙岱生,等.固体废弃物修复荒漠化土壤的研究［J］.土壤通报,2004,35(3):267-270. [10] 苏德纯,张福锁,WongJWC.粉煤灰钝化污泥对土壤理化性质及玉米重金属累积的影响［J］.中国环境科学,1997,17(4):321-325. [11] 闫军辉,赵智燕,何亚丽.两个高羊茅品种成熟种子再生体系的建立［J］.草业学报,2011,20(2):210-218. [12] 南京农业大学主编.土壤农化分析(第二版)［M］.北京:农业出版社,1986. [13] 李合生.植物生理生化实验原理及技术［M］.北京:高等教育出版社,2002:185. [14] 叶嗣宗.土壤环境背景值在容量计算和环境评价中的应用［J］.中国环境监测,1993,(3):52-53. [15] Lidon F C, Henriques F S. Effects of increas ing concent ration of Cu on metal uptake kinetics and biomass yields［J］. Soil Sci,1992,154:44-49. [16] Chapman H P. Diagnostic criteria for plants and soils ［M］. California: University of California, 1966. [17] 中华人民共和国卫生部.食品添加剂使用卫生标准(GB2760-2007)［S］.2007. -
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