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保护性耕作对旱作农田耕层土壤肥力及酶活性的影响
引用本文:罗珠珠,黄高宝,Li Guangdi,张仁陟,蔡立群.保护性耕作对旱作农田耕层土壤肥力及酶活性的影响[J].植物营养与肥料学报,2009,15(5):1085-1092.
作者姓名:罗珠珠  黄高宝  Li Guangdi  张仁陟  蔡立群
作者单位:1.甘肃农业大学资源与环境学院,甘肃兰州 730070;
基金项目:国家科技支撑计划,中澳合作ACIAR项目 
摘    要:通过田间定位试验,研究了不同耕作方式对黄土高原西部旱农区耕层土壤肥力和酶活性的影响。结果表明,秸秆还田可以显著提高 0—5和5—10 cm土层有机质、全氮、全磷、全钾、铵态氮、速效磷、速效钾和3种水解酶活性; 10—30 cm 土层仅提高了有机质、全钾和速效钾含量,对其余各养分含量和水解酶活性并无明显影响。免耕降低了0—5、5—10和10—30 cm土层硝态氮含量,但对过氧化氢酶活性有明显促进作用。相关分析表明,土壤有机质、养分和碱性磷酸酶、蔗糖酶活性之间呈极显著相关关系。进一步应用主成分分析表明,土壤有机质、养分和水解酶活性共同反映着黄土高原雨养农区土壤肥力水平的高低。

关 键 词:    秸秆还田    旱作农田    土壤养分    土壤酶活性
收稿时间:2008-9-28

Effects of conservation tillage on soil nutrients and enzyme activities in rainfed area
LUO Zhu-zhu,HUANG Gao-bao,LI Guang-di,ZHANG Ren-zhi,CAI Li-qun.Effects of conservation tillage on soil nutrients and enzyme activities in rainfed area[J].Plant Nutrition and Fertilizer Science,2009,15(5):1085-1092.
Authors:LUO Zhu-zhu  HUANG Gao-bao  LI Guang-di  ZHANG Ren-zhi  CAI Li-qun
Institution:1.Resources and Environment Faculty of Gansu Agricultural University,Lanzhou 730070,China;
Abstract:Based on the field experiments conducted in Dingxi of the western Loess Plateau, effects of the conventional tillage and five conservation agricultural patterns, namely conventional tillage, conventional tillage with stubble incorporating, no tillage with no stubble, no tillage with stubble retention, conventional tillage with plastic mulching and no tillage with plastic mulching on soil nutrients and enzyme activities in a rainfed farming system were studied. The results show that contents of soil organic matter, total N, total P, total K, NH4+-N, available P and K, soil urease, alkaline phosphates and invertase activities at the 0–5 and 5–10 cm layers are increased in the two stubble retention systems. Moreover, in the two stubble retention systems, soil organic matter, total K and available K are improved greatly at the 10–30 cm depth of soil. Soil catalase activity is improved at the 0–30cm depth of soil in the three no-tillage systems, while NO3--N content is decreased. There are significant correlations between soil organic matter, contents of the nutrients, alkaline phosphatase and inverstase activities. Principal component analysis indicates that soil organic matter, nutrients and hydrolases could be used to evaluate soil fertility in rainfed areas of Loess Plateau.
Keywords:no tillage  stubble retention  rainfed  soil nutrient  soil enzyme activities
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