摘要
采用田间试验方法研究了干旱半干旱地区小麦田不同土层土壤理、化、生等因素与土壤反硝化酶活性、N2O排放通量的相关性。结果表明,在冬小麦生育期内,0—5cm土层土壤硝酸还原酶活性与相应土层土壤亚硝酸还原酶活性呈显著正相关,0—5cm,5—10cm土层土壤的温度与相应土层土壤硝酸还原酶活性呈显著负相关,土壤硝态氮含量和pH与土壤反硝化还原酶活性的相关性因土壤的不同土层而有差异;0—5cm,5—10cm土层土壤含水量,0—5cm,10—20cm土层土壤脲酶活性,5—10cm有机碳含量,硝酸还原酶活性与土壤中N2O排放通量呈显著正相关;5—10cm土层土壤温度、pH和10—20cm土层土壤磷酸酶活性、pH与之呈显著负相关。土壤N2O的排放主要是土壤反硝化作用的结果。
The correlations between physical, chemical and biological properties and denitrifying enzyme activity, soil N2O flux were studied by field experiments during the course of wheat growing stages in both arid and semi-arid areas. It has been indicated that there existed the positive correlations between NR activity and nitrate-N contents; NiR activity and soil pH; N2O flux and WFPS, organic carbon contents and NR activity, urease activity. There were negative between NR activity and pH; NiR activity and nitrate-N contents; N2O flux and the temperature of at specific depth, pH and phosphorylase activity. In addition, N2O flux was mainly derived from denitrification.
出处
《农业环境保护》
CSCD
北大核心
2002年第3期193-196,共4页
Agro-Environmental Protection
基金
国家自然科学基金部分资助(39970151)
