晋南长期免耕褐土肥力和酶活性的关系

临汾市尧都区机械化保护性耕作试验示范区连续18年免耕覆盖(NTCS18)、连续12年免耕覆盖(NTCS12)、连续10年免耕覆盖(NTCS10)和传统耕作(CK)对土壤肥力和酶活性的影响研究结果表明,长期免耕提高了表层土壤有机质、碱解氮、速效磷、速效钾、全氮、全磷、全钾含量,并使表层土壤脲酶、蔗糖酶、过氧化氢酶活性显著增加;相关分析研究表明,长期免耕条件下土壤肥力与土壤酶活性间关系密切,蔗糖酶、过氧化氢酶、脲酶可以用来评价长期免耕土壤肥力状况;主成分分析法研究表明,长期免耕土壤肥力和酶活性信息系统主成分得分由高到低顺序为:NTCS18>NTCS12>NTCS10>CK,说明长期免耕利于土壤肥力水平和酶活性提高,而且肥力水平和酶活性随免耕年限的延长而提高。长期免耕利于土壤综合肥力的提高,利于农业的可持续发展,是北方干旱半干旱地区可行的一种耕作方式。

Relationship between Soil Fertilities and Soil Enzyme Activities of Long-term No-tillage in Cinnamon Soil in South Shanxi

Effects of long-term no-tillage on soil fertility,enzyme activities and their correlation were studied by using traditional tillage and Long-term no-tillage soil in ChengHuang experiment wheat field,which is located in Yaodu District of Linfen City in the loess plateau.The result indicated that contents of soil organic matter,total N,total P,total K,alkaline N,available P,and available K soil were increased in the long-term no-tillage soil,compared with traditional tillage soil.Activities of catalase,urease and invertase of the no-tillage soil were above the traditional tillage soil significantly.Soil enzyme activities correlates closely on fertility of long-term no-tillage soil,so the activities of catalase,urease and inverease of the no-tillage soil may be used for evaluating the soil fertility well.Principal component analysis indicated that the years of no-tillage had significant impacted on the activities and fertility of no-tillage soil.Long-term no-tillage is beneficial to soil fertility and sustainable development of agriculture.It is a feasible tillage pattern in arid and semiarid areas in the north of China.