保护性耕作玉米不同生育期土壤生物肥力与化学肥力的相关性研究

Correlations Between Biological and Chemical Fertilities of Soil in Maize Conservation Tillage

通过田间试验研究吉林省中部黑土区保护性耕作玉米不同生育期土壤酶活与土壤养分以及微生物区系的相关性。结果表明,土壤脲酶在玉米收获后与土壤全氮、全磷极显著相关;在灌浆期以后与土壤pH值极显著相关;在播种前、拔节期和收获后与土壤碱解氮含量显著相关;与土壤有效磷和速效钾没有表现出明显的相关性;与土壤微生物数量没有表现出相关性。土壤磷酸酶(酸性、碱性和中性)在玉米关键生育期与土壤全氮和全磷显著或极显著相关;与有效磷、速效钾和pH值(负相关)除灌浆期以外均表现了较为明显的相关性,说明土壤磷酸酶活性受土壤养分状况及pH值的影响十分显著;磷酸酶在播种前与土壤微生物数量达到极显著相关,但在玉米生长后期没有表现有规律的相关性。土壤酶活性与土壤有机质含量均表现了较好的相关性,与土壤全钾含量没有表现出明显的相关性。

The correlations among soil enzyme activities,soil nutrient and variations of microflora were investigated at black soil area of central Jilin during different developmental stages of maize.Soil urease activity was significantly correlated with soil total N and total P contents(P≤0.01) at post-harvest stage and pH(P≤0.01) after filling stage.As well as,soil urease was significantly correlated with alkali-hydrolyzable N(P≤0.05) at pre-planting,jointing and post-harvest stages.However,soil urease showed no si...