摘要
为了探讨工业造纸废水用于杨树人工林灌溉的可行性,以三倍体毛白杨(triploid Populus tomentosa)1年生盆栽苗木为对象,研究了不同浓度造纸废水(分别稀释到12.5%(1F7Q)、16.7%(1F5Q)、25%(1F3Q)、33.3%(1F2Q)、50%(1F1Q))灌溉对苗木生长及养分状况、土壤化学性质的影响。结果表明:造纸废水灌溉对土壤pH值、速效P含量无显著影响(P>0.05),但能显著提高土壤有机质、全N及碱解N的含量(P<0.05)。适当稀释的废水灌溉能促进三倍体毛白杨的苗木生长,提高土壤和植株养分水平:灌溉后1F5Q地径、苗高生长量分别为10.5 mm和97.3 cm,较CK分别显著增加102%和47%(P<0.05);1F5Q和1F3Q处理苗木总生物量为247 g和230 g,分别较CK显著提高19%和11%(P<0.05);废水灌溉可显著提高植株根、叶N含量和茎P含量(P<0.05),但对植株叶、根P含量和茎N含量影响不大(P>0.05)。造纸废水通过一定处理后,可应用于苗木灌溉并促进其生长,提高地力。对于三倍体毛白杨,将废水稀释到16%—25%能起到较好的灌溉效果。
The pulp and paper industry is a very large consumer of fresh water, and almost all the input reappears as effluent requiring treatment and disposal. As poplar can recycle organic residues from wastewater due to its high water and nutrient use, paper mill effluent （PME） could serve as a source of water and nutrients for poplar plantations. Consequently, irrigating poplar plantations with PME will reduce the need for other inputs of irrigation and fertilization. However, some elements （e. g. Na） which commonly occur in PME also represent a potential risk to poplar growth, since they have only moderate tolerance to salinity. Improper irrigation can result in toxicities and nutrient imbalance in plants. We hypothesized that diluting PME with pure water to a suitable concentration could avoid negative effects and would have better irrigation and fertilization value. In this study, a pot experiment was conducted from June to September in 2009 to investigate the effect of irrigation with different dilutions of PME on （ 1 ） the growth and nutrient status of one-year-old triploid Populus tomentosa seedlings and （2） soil chemical properties. The experiment included five PME irrigationtreatments which diluted the concentration of PME to 12.5% （1F7Q）, 16.7% （ 1F5Q）, 25% （ 1F3Q）, 33.3% （1F2Q） and 50% （1F1Q）, respectively. A control pure water irrigation treatment （CK） was also included. At the end of the experiment, height, ground-level diameter, and biomass of the seedlings in all treatments were measured as indicators of plant growth , total N and P of stems, leaves, and roots were analyzed to indicate plant nutrient status, and soil chemical properties （pH, organic matter, total N, available N and P） were also measured. PME irrigation had no significant effect on the pH and available P content of the soil （P〉0.05）, but percentages of organic matter, total N, and available N increased significantly with increasing concentration of PME （P 〈 0.05 ）. With appropriate dilution, PME irrigation significantly increased the N content in roots and leaves and the P content in stems （P〈O. 05 ）, but had no significant influence on the P content in leaves and roots and the N content in stems （P〉0.05）. The growth of P. tomentosa seedlings increased markedly when the concentration of PME increased from 12.5% （1F7Q） to 16.7% （1F5Q）, but when the concentration continued to increase （1F3Q, IF2QI 1F1Q）, increments in ground-level diameter and height decreased gradually. Relative to the CK treatment, the increment of ground-level diameter and height of P. tomentosa seedlings following only the 1F5Q treatment were significantly higher （102% and 47% respectively, P 〈 0.05 ）. Biomass of P. tomentosa seedlings in the 1 F5Q and 1 F3 Q treatments reached 247 and 230 g, respectively, which were significantly higher than the CK treatment （19.3% and 11.1%, P〈0.05 ）. However, no significant difference was detected between the other PME treatments and CK （P〉0.05）. In conclusion, PME irrigation promoted the growth of P. tomentosa seedlings, and increased plant nutrient status and soil fertility. When the dilution concentration of PME was appropriate, the growth of P. tomentosa seedlings was significantly improved by PME irrigation. Consequently, our findings suggest that PME can be used to irrigate P. tomentosa seedlings, but it should be diluted to an appropriate concentration. From our results, it is recommended that the dilution concentration of PME should be 16%--25%, and trials are needed to validate these conclusions under field conditions.
出处
《生态学报》
CAS
CSCD
北大核心
2013年第5期1626-1635,共10页
Acta Ecologica Sinica
基金
国家林业公益性行业科研专项经费重大项目(201004004)
北京林业大学"985"优势学科创新平台开放基金(000-1108003)
关键词
造纸废水
灌溉
三倍体毛白杨
苗木
植物养分
paper mill effluent
irrigation
triploid Populus tomentosa
seedling
plant nutrients
