不同培肥措施对红壤茶园土壤微生物量碳的影响

研究了经过4年不同培肥措施后红壤茶园土壤微生物量碳变化.结果表明:稻草覆盖后不同比例有机无机肥配施、间作三叶草以及全施化肥处理对土壤微生物量碳均有明显提高;全年土壤微生物量碳年变化都呈现"低-高-低-高"的趋势,且在不同时期对微生物量碳的影响不同;与对照(CK)相比,稻草覆盖 100%有机肥(T1)、稻草覆盖 75%有机肥 25%化肥(T2)、稻草覆盖 50%有机肥 50%化肥(T3)、稻草覆盖 25%有机肥 75%化肥(T4)、100%化肥(T5)和间作三叶草 不施肥(T6)土壤微生物量碳全年平均值分别高出17.05%、32.38%、32.05%、24.30%、26.23%和24.63%,且差异均达到显著水平(P＜0.05);土壤微生物量碳与活性有机质、土壤全氮、微生物量氮、微生物量磷呈显著正相关,与速效氮、土壤全磷、土壤全钾、土壤含水量之间关系不显著;与单施化肥和全量投入有机物料相比,有机物和化肥配合施用更有利于提高土壤肥力.

Effects of different fertilization on red soil microbial biomass C in tea garden

The study on the dynamics of red soil microbial biomass C in tea garden after 4 years different fertilization showed that straw mulching combined with applying organic manure and chemical fertilizer,intercropping white clover,and applying chemical fertilizer could all increase the amount of soil microbial biomass C significantly.The annual variations of soil microbial biomass C all presented the tendency of low-high-low-high,and the effects of fertilization varied with different periods.The annual average of soil microbial biomass C in treatments T1(straw mulching 100% organic manure),T2(straw mulching 75% organic manure 25% chemical fertilizer),T3(straw mulching 50% organic manure 50% chemical fertilizer),T4(straw mulching 25% organic manure 75% chemical fertilizer),T5(100% chemical fertilizer) and T6(intercropping white clover) were 17.05%,32.38%,32.05%,24.30%,26.23% and 24.63% higher than CK,respectively,and the differences were significant(P<0.05).Soil microbial biomass C had significant positive correlations with soil active organic matter,total nitrogen,and microbial biomass N and P,but no significant correlations with soil available nitrogen,total phosphorus,total potassium,and moisture content.In comparing with applying chemical fertilizer or organic manure alone,their combination was more advantageous in improving soil fertility.