| 3种除草剂对免耕土壤生态系统部分功能的影响 |
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| 引用本文： | 李辉信,吴珊眉.3种除草剂对免耕土壤生态系统部分功能的影响[J].南京农业大学学报,1990(4). |
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| 作者姓名： | 李辉信 吴珊眉 |
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| 作者单位： | 南京农业大学土壤农业化学系
(李辉信)，南京农业大学土壤农业化学系(吴珊眉) |
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| 摘 要： | 施用常量和过量的绿麦隆、百草敌和虎威于免耕的旱地黄棕壤表面,研究其对土壤生态系统中 CO_2释放量、酶活性及氮素转化的影响。结果表明:3种除草剂对土壤呼吸都有不同程度的抑制,百草敌>虎威>绿麦隆,浓度愈大,抑制愈强;对不同土壤酶的抑制为:脲酶>转化酶>过氧化氢酶。土壤中 NH_4~+-N和 NO_3~--N 的总量因使用除草剂而增加,并与施用量呈正相关,只有过量的百草敌和虎威会抑制硝化作用。覆盖免耕能减弱绿麦隆对土壤呼吸强度、转化酶、脲酶活性和硝化作用的抑制。
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| 关 键 词： | 除草剂 免耕 土壤呼吸 酶活性 |
EFFECTS OF THREE HERBICIDES ON SOME FUNCTION OF NO TILLAGE ECOSYSTEMS |
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| Li Huixin Wu Shanmei.EFFECTS OF THREE HERBICIDES ON SOME FUNCTION OF NO TILLAGE ECOSYSTEMS[J].Journal of Nanjing Agricultural University,1990(4). |
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| Authors: | Li Huixin Wu Shanmei |
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| Institution: | Department of Soil Science and Agricultural Chemistry |
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| Abstract: | Three species of herbicides,chlortoluron,dicamba and fomesafen,were sprayed onnotillage fields of yellow-brown earth at normal and excess doses.The effects of differentherbicides at tested doses,and of chlortoluron with different tillage measure on function ofsoil ecosystems were studied.The results indicated that:according to three herbicides's de-gree of the restraint to soil respiration,the order is dicamba>fomesafen>chlortoluron;thehigher the doses,the more the restraint.Different soil enzymes had different sensitivity toherbicides,the order is urease>invertase>catalase.The sum of NH_4~+-N and NO_3~--N in sur-face soil was increased when herbicides had been sprayed.Ecosystems of notillage with cropresidues could reduce the restraint of chlortoluron to soil respiration,invertase activity,urease activity and nitrification. |
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| Keywords: | herbicides notillage soil respiration enzyme activity |
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