大气污染物SO<sub>2</sub>对农作物环境的影响研究

大气污染物SO₂对农作物环境的影响研究

摘要: 按照某燃煤电厂扩建工程预测的大气SO₂浓度，模拟试验研究低浓度SO₂对小麦的慢性伤害和高浓度SO₂对玉米的急性伤害阈值结果表明，小麦“津85-3”和“绵阳15”减产5％的慢性伤害阈值剂量分别为8．329mg·h、20．519mg·h，阈值浓度为0．043mg／m³、0．122mg／m³。高浓度SO₂对玉米三叶期幼株的急性伤害临界剂量为2．50mg／m³×4h、4．92mg／m³×2h和7．38mg／m³×1h，当玉米叶片枯斑率达5％时其急性伤害阈值为5．90mg／m³×8h、6．49mg/m³×6h、11．80mg／m³×4h、15．00mg／m³×2h和17.00mg/m³×lh。

Abstract: The influence of atmosphere infectant SO₂ on crops was studied by simulate test．The results show that under low concentration S0₂ the threshold dosage of chronic harm for“Jin85-3”and“Mianyang15”is 8．329 mg·h and 20．519mg·h，the threshold concentration is 0．043 mg／m³ and 0．122mg/m³ respectively when output of wheat decreases 5％．the fastness of wheat“Mianyang 15”is better．Under the high concentration SO₂ the critical dosage of acute harm to under age cornis 2．50mg／m³×4h，4．92mg／m³×2h and 7．38mg／m³×lh，whenits harm is seen．Thethreshold dosage of acute harm to corn is 5．90mg／m³ × 8h，6．49mg／m³ ×6h，11．80mg／m³ ×4h，15．00rag／m³×2h，and 17．O0mg／m³×1h．when the withered spot of laminae reached 5％．