摘要
培肥保水定位试验表明,麦秸覆盖具有良好的保水效果。覆盖处理的水势明显高于厩肥、化肥和无肥等处理。水势绝对值相差50—170mmHg,而且在小麦主要生育期内秸秆覆盖的水分状况均比其他处理好。在土壤水分与养分复因子影响下,秸秆覆盖表现出不同的生物效应。当土壤含水量较高(13—19%)时,厩肥处理细菌数与脲酶活性皆高。秸秆覆盖因碳氮比大,土壤生物活性次于厩肥处理;在水分较少(<13%)时,水分上升为主要影响因子,土壤生物活性则随土壤水分含量的高低而变化,秸秆覆盖的生物活性最高。覆盖若能配合施用适量氮肥使碳氮比适宜,有利于培肥保水,增强土壤生物活性。
The results from the fixed Position experiments for bettering soil fertilityand conserving soil moisture showed that wheat straw mulching had better effe-cts upon moisture conservation in soil.Water potential of tmulching treatmentswas obviously higher than that by other treatments including stable manure,chemical fertilizer application.The absolute difference value of water potentialwas 50—170 mm Hg.During the main growth period of winter wheat,mois-ture condition of mulching treatment was far better than the others.Under theinfluence of both moisture and nutrition of soil factors,straw mulching showedvarious biologioal effects.When soil water content was higher(13—19%),thebacterial numbers and urease activity in stable manure treatment was also higher.The C:N ratio of straw mulching was higher than soil biolcgical activity butless than stable manure treatment.When soil water content was smaller(lessthan 13%),soil moisture rlsing became a major influencing factor.As a res-ult,soil biological activity changed with the increasing and decreasing of soilmoisture.At this time,the biological activity of straw mulching was the high-est.Straw mulching with proper amount of N fertilizer added to may obtain thesuitable C:N ratio,which is favourable to better soil fertility,conserve soilmoistture and increase biological activity in soil.
出处
《干旱地区农业研究》
CSCD
北大核心
1991年第3期61-66,共6页
Agricultural Research in the Arid Areas
关键词
土壤
秸秆覆盖
温度
微生物
旱地
straw multching
soil water content
soil temperature
soil micro-organisms
rainfed land
