اثر تجمعی لجن فاضلاب بر برخی ویژگی‌های فیزیکی و شیمیایی خاک

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار گروه خاک‌شناسی، دانشکده کشاورزی، دانشگاه ولی‌عصر، رفسنجان

2 استاد گروه خاک‌شناسی، دانشکده کشاورزی، دانشگاه صنعتی اصفهان

3 استادیار گروه زراعت و اصلاح نباتات، دانشکده کشاورزی، دانشگاه ولی‌عصر، رفسنجان

چکیده

لجن فاضلاب مقدار نسبتاً زیادی مواد آلی و املاح دارد که بر خصوصیات  فیزیکی و شیمیایی خاک تأثیر می‌گذارد و در صورت استفاده بهینه می‌تواند به‌عنوان یک کود ارزان قیمت مورد استفاده قرار گیرد. در ایران مطالعات در زمینه تأثیر لجن فاضلاب بر خواص شیمیایی خاک تا حدودی انجام گرفته است ولی تحقیقات بر روی خواص فیزیکی خاک اندک است. در این پژوهش به‌منظور بررسی تأثیر تجمعی لجن فاضلاب بر هدایت هیدرولیکی، جرم مخصوص ظاهری، پایداری خاکدانه، نفوذ آب در خاک، EC و pH خاک، آزمایشی در قالب طرح بلوک‌های کامل تصادفی با هفت تیمار (صفر، 22/5×1, 22/5×2, 22/5×3,  45×1, 45×2 و 45×3 تن در هکتار لجن فاضلاب) در سه تکرار به‌مدت سه سال انجام گرفت. پس از اعمال تیمار‌ها در سال سوم، خواص فیزیکی و شیمیایی خاک اندازه‌گیری گردید. با افزایش سطح لجن، هدایت هیدرولیکی اشباع خاک، نفوذپذیری، پایداری خاکدانه و EC خاک افزایش و وزن مخصوص ظاهری کاهش یافت. همبستگی معنی‌داری بین مقدار لجن و خصوصیات فیزیکی وجود داشت. در تجزیه به عاملها، مقدار لجن و کلیه خصوصیات فیزیکی خاک با ضرایب بالا در عامل اول یعنی عامل خواص فیزیکی که بیش از 71 درصد واریانس را توجیه می‌کند، حضور یافتند که نشان‌دهنده تأثیر زیاد لجن بر خواص فیزیکی خاک بود. در عامل دوم که عامل pH یا عامل خصوصیات شیمیایی خاک است، فقط pH دارای ضریب بالا بود. عامل دوم 17درصد از واریانس موجود را توجیه نمود و هیچ رابطه‌ای با خواص فیزیکی خاک نشان نداد.

کلیدواژه‌ها


عنوان مقاله [English]

Cumulative Effects of Sewage Sludge on Soil Physical and Chemical Characteristics

نویسندگان [English]

  • Hossein Shirani 1
  • Mohammadali HajAbbasi 2
  • Majid Afyouni 2
  • Hossein Dashti 3
1 . Assist. Prof. of Soil Sciences, Dept. of Agriculture, ValiAsr University, Rafsanjan
2 Prof. of Soil Sciences, Dept. of Agriculture, Isfahan University of Tech., Isfahan
3 Assist. Prof., Dept. of Agriculture, Vali Asr University, Rafsanjan.
چکیده [English]

Wastewater sludge has relatively high amounts of organic matter and salts which favorably affect the physical and chemical characteristics of the receiving soil. Hence, it can be used as a cheap fertilizer if properly utilized. A number of studies have been reported in Iran on the effects of sludge on soil chemical properties but few studies have been conducted to investigate its effects on soil physical characteristics. In order to study the cumulative effects of sludge on hydraulic conductivity, bulk density, MWD, soil infiltration, EC, and soil pH, an experiment was conducted in a complete randomized design with 7 treatments  ( 1 × 22.5, 2 × 22.5, 3 × 22.5,  1 × 45, 2 × 45 and 3 × 45 ton/ha wastewater sludge) in three replications over three years. The above mentioned traits were measured after the third year of the experiment period. Results showed that increasing amounts of sludge enhanced saturated hydraulic conductivity, soil infiltration, MWD, and EC but decreased bulk density. A significant correlation was observed between the amount of sludge and soil physical characteristics. Factor analysis showed that the amount of sludge and all soil physical characteristics were in first order (physical characteristic factor) which explained 71% of the total variance, indicating the high impact of sludge on soil physical characteristics. The second factor was pH (a chemical characteristic) that explained only 17% of the total variance. Finally, no relationship was found between pH and soil physical characteristics.

کلیدواژه‌ها [English]

  • Cumulative Effects
  • sewage sludge
  • Soil Physical Characteristic
  • Factor analysis
1- Angers, D. A., and Mehuys, G.R. (1989). “Effects of cropping on carbohydrate content and water-stable aggregation of a clay soil.” Can. J. Soil Sci., 69 (2), 373-380.
2- Baker, E. G., and Mathews, P.G. (1983). “Metals in sewage sludge and their potential effects in agriculture.” Water Sci. Res., 15 (1), 209-225.
3- Deiana, S., Gessa, C., Manunza, B., Rausa, R., and sebber, R. (1990). “Analytical and spectroscopic characterization of humic acids extracted from sewage sludge, manure and worm compost.” Soil Sci. ,150 (1), 419-424.
4- McCasline, B. D., and Connor, G. A. O. (1982). Potential fertilizer value of sewage sludge on a calcareous soil, New Mexico State Univ. Agri. Exp Bull., 692.
5- Smith, S. R. (1992). “Sewage sludge and refuse compost as peat alternatives for conditioning impoverished soils.” J. Hort. Sci., 67 (2), 703-716.
6- Afyuni, M. (1987). “Extractability of Fe, Zn, and Cd in sludge amended calcareous soils.” MSc. Thesis., New Mexico State Univ., Las Cruces, NM.
7- Handreck, K. A. (1994). “Effect of pH on the uptake of Cd, Cu, and Zn from soilless media containing sewage sludge.” Common. Soil Sci. Plant Anal., 25 (11), 1913-1927.
8- Giusquianni, P. L., Gigliotti, G., and Businelli, D. (1992). “Mobility of heavy methods in urban amended soils.” J. Environ. Qual., 21 (3), 336-345.
9- Giusquianni, P.L., Pagliai, M., Gigliotti, G., Businelli, D., and Benetti, A. (1995). “Urban waste compost: Effects on physical, chemical, and biochemical soil properties.” J. Environ. Qual., 24 (1), 175-182.
10- Felton, G. K. (1995). “Soil hydraulic properties on municipal solid waste.” Trans ASAE, 38 (3), 775-782.
11- Glauser, R., Doner, H. E., and  Poul, E. A. (1988). “Soil aggregate stability as a function of particle size in sludge treated soils.” Soil Sci., 146 (1), 37-43.
12- Tester, C. F. (1990). “Organic amendment effects on physical and chemical properties of sandy soil.” Soil Sci. Soc. Am. J., 54 (1), 827-831.
13- Epstein, E. (1975). Effect of sewage sludge on some soil physical properties.” J. Environ. Qual., 4 (2), 139-142.
14- Abusharar, T. M. (1993). “Effects of sewage sludge treatments on aggregate slaking, clay dispersion and hydraulic conductivity of semi-arid soil sample.” Geoderma, 59 (1-4), 327-343.
15- Pagliai, M., Guide, G., Marca, M., Giachetti, M., and Lucament, G. (1981). “Effects of sewage sludge and compost on soil porosity and aggregation.” J. Environ. Qual., 4 (1), 556-561.
16- Kladiokov, E. J., and Nelson, D. W. (1979). “Changes in soil properties from application of anaerobic sludge.” Soil Sci., 153 (2), 53-61.
17- Pagliai, M., and Antisari, L. (1993). “Influence of waste organic matter on soil micro and macrostructure.” Bioresource Technol., 43 (3), 205-213.
18- Blake, M. H., and Hartage, K. H. (1986). “Bulk density determination. methods of soil analysis. Part 1. Physical and mechanical methods.” Soil Sci. Soc. Am. J., Agronomy monograph. P. 363-373.
19- Kemper, D., and Rosenou, C. (1986). “Aggregate stability and size distribution. methods of soil analysis. Part 1. Physical and mechanical methods.” Soil Sci. Soc. Am. J. Agronomy monograph. P. 425-440.
20- Panahpoor, E., Afyuni, M., Homaee, M., and Hoodaji, M. (2008). “Cd, and Co motion in soil treated with sewage sludge and salts of the metals and their uptake by vegetable crops, A case study in east Isfahan.” J. of Water and Wastewater, 67, 9-17.
 
شماره 3 سال 1389                                                                                                                        آب و فاضلاب
 
 
21- Chen, Y., and Avnimelech, Y. (1986). The role of organic matter in modern agriculture, 1stEd., Matinus Nijhoff, Netherlands.
22- Cosby, B.J., Hornberger, G.M., Clapp, R. B., and Ginn, T.R. (1984). “A statistical exploration of the relationship of soil moisture characteristics to the physical properties of soils.” Water Resources Res., 20(6), 682-690.
23- Morel, J. L., and Guckert, A. (1983). The influence of sludge application on physical and biological properties of soils, 1st Ed., Dordrecht, Holland.
24- Lal, R. (1999). “Soil compaction and tillage effects on soil physical properties of a Mallic Ochraqualfs in northwest Ohio.” J. Sustainable Agric., 14, 53-65.
25- Shirani, H., Hajabbasi, M. A., Afyuni, M., and Hemmat, A. (2002). “Effect of farmyard manure and tillage systems on soil physical properties and corn yield in central Iran.” Soil and Tillage Res., 68 (2), 101-108.
26- Ekwue, E. I., and Stone, R. J. (1995). “Organic matter effects on the strength properties of compacted agricultural soils.” Trans. ASAE., 38 (2), 357-365.
27- Felton, G.K. (1995). “Soil hydraulic properties on municipal solid waste.” Trans ASAE, 38 (3), 775-782.
28- Ohu, J.O. (1985). “Peatmoss influence on strength hydraulic conductivity characteristics and crop production of compacted soils.” Ph.D. Thesis., MacDonald College, Gill University.
29- Bear, M.H., Hendrix, P. F., and Coleman, D. C. (1994). “Water stable aggregates and organic carbon fractions in conventional and no-tillage soils.” Soil Sci. Soc. Am. J., 58 (3), 777-786.
30- Nyamangara, J., Gotosa, J., and  Mpofu, S. E. (2001). “Cattle manure effects on structural stability and water retention capacity of a granitic sandy soil in Zimbabwe.” Soil and Tillage Res., 62 (3-4), 157-162.
31- Martens, D. A., and Frankenberg, W.T. (1992). “Modification of infiltration rates in an organic amended irrigated.” J. of Agron., 84 (4), 707-717.