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臭氧污染对水稻土物理结构和氮磷钾含量的影响

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  • 国家科技期刊平台
  • NETL
  • NSTL
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  • 维普
利用中国稻-麦轮作O3FACE(Free-air O3 concentration enrichment)试验平台,研究了连续3年大气O3浓度升高(较周围大气高50％)对稻田表层(O～20 cm)土壤团聚体、土壤容重及孔隙度和氮磷钾养分含量的影响.结果表明,大气O3浓度升高显著增加耕层土壤0.25 ～0.053 mm团聚体23.5％和降低＜0.053 mm团聚体24.6％.O3污染具有增大0～10 cm土层和降低10 ～ 20 cm土层土壤容重的趋势,0～10 cm土壤中气体孔隙度显著减小39.8％,10 ～ 20 cm土壤中毛管孔隙度显著增加9.1％和气体孔隙度显著减小32.4％,改变了固、液、气三相比.长期O3污染显著降低土壤全氮含量10.5％和速效钾13.3％,显著增加有效磷40.8％,但对有效氮未产生显著影响.结果表明,长期臭氧污染将改变土壤物理结构和养分物质的生物地球化学循环.
EFFECT OF OZONE POLLUTION ON PHYSICAL STRUCTURE AND CONTENTS OF NITROGEN, PHOSPHORUS AND POTASSIUM OF PADDY SOIL
With the aid of the Free-Air ozone Concentration Enrichment ( O3-FACE) system, effects of elevated atmospheric ozone (pO3) on topsoil (0 ~20 cm) aggregate, bulk density, porosity and contents of nitrogen, phosphorus and potassium of paddy soil were investigated. The paddy field had been under rice/wheat rotation and exposed to elevated atmospheric ozone, 50% higher than the ambient pO3, for three years. Results show that elevated pO3 significantly increased 0. 25 ~0. 053 mm aggregates by 23. 5% and significantly decreased <0. 053 mm slit + clay fraction by 24. 6% in topsoil; obviously increased soil bulk density in the 0 ~ 10 cm soil layer and decreased the density in the 10 ~ 20 cm soil layer; decreased gas porosity by 39. 8% and 32.4% in the 0 ~ 10 cm and 10 ~ 20 cm soil layers respectively, and increased capillary porosity by 9. 1% in the 10~20 cm soil layer, thus altering the soil in proportion of solid, liquid and gas; reduced soil total nitrogen content by 10. 5% and available potassium by 13. 3% , increased available phosphorus by 40. 8 % , and however, did not affect much available nitrogen. It is quite obvious that long-term exposure to elevated atmospheric pO3 will alter physical structure of the soil and biogeochemical cycle of nutrient substances therein.

Ozone pollutionRice-wheat rotationSoil aggregateSoil bulk densitySoil porosityNutrient

寇太记、刘德鸿、徐晓峰、王世华、苗艳芳、朱建国

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河南科技大学农学院,河南洛阳471003

土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所),南京210008

臭氧污染 稻-麦轮作 土壤团聚体 土壤容重 孔隙度 养分

国家自然科学基金土壤与农业可持续发展国家重点实验室开放基金国家科技部国际科技合作计划项目中国科学院知识创新方向项目中国科学院装备研制项目河南科技大学人才基金

41003030Y0520100302009DFA31110KZCX2-EW-414YZ060309001266

2012

土壤学报
中国土壤学会

土壤学报

CSTPCDCSCD北大核心
影响因子：2
ISSN：0564-3929
年,卷(期)：2012.49(6)
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