摘要
在大田条件下,研究了地膜覆盖对杨树林下0—20cm和20—40cm土层的土壤理化性质、土壤微生物数量、酶活性、微生物量碳及活跃微生物量的影响。结果表明,在0—20cm土层,覆膜处理可显著增加土壤含水量和碱解氮含量,而有机质、全氮、速效磷和pH值却明显降低;土壤细菌数和真菌数分别增加了44.89%和42.58%,放线菌数变化不明显;土壤过氧化氢酶、蔗糖酶和多酚氧化酶活性分别提高了29.25%,83.66%和28.95%,而脲酶活性却降低了13.02%;土壤微生物量碳和活跃微生物量分别增加了27.44%和31.87%,有利于土壤养分的分解和有效化。20—40cm土层与0—20cm土层土壤表现出基本一致的变化规律,但覆膜与对照之间的差异变小,表明随着土层深度的增加,覆膜的影响作用减小。综合分析认为,地膜覆盖对杨树林下土壤,尤其是表层土壤的生态环境具有明显的改善作用。
The study was conducted to determine the plastic film mulching on the soil physical, chemical and biological properties such as soil microbial population, enzymatic activity, microbial biomass carbon and ac- tive microbial biomass a the 0--20 cm and 20--40 cm soil layers under the poplar field conditions. The re- sults showed that the soil water and alkaline hydrolysis N contents within the depth of 20 cm increased obvi- ously with the plastic film mulching compared with the traditional treatment while the pH value and the con- tents of organic matter, total nitrogen and available P decreased; the numbers of bacteria and fungi increased by 44.89% and 42.58%, respectively; the number of actinomyces had no significant changes; the activity of urease enzyme deceased by 13.02% the activity of catalase enzyme, invertase enzyme and polyphonic oxi- dase enzyme improved by 29.25%,83.66% and 28.95% respectively, which was in favour of decomposition and utilization of the soil nutrients. The changes between that in the 0--20 cm and 20--40 cm soil layers were similar while the variations between the traditional treatment and plastic film mulching were less in the 20--40 cm soil layer, which indicated that the effects of plastic film mulching on poplar field weakened with the increase of soil depth. It is concluded that plastic film mulching obviously ameliorated the ecological envi- ronment of the soil in the poplar field, especially in the topsoil.
出处
《水土保持通报》
CSCD
北大核心
2013年第6期269-273,共5页
Bulletin of Soil and Water Conservation
基金
山东省农业重大应用技术创新项目"杨树超高产栽培关键技术研究"
关键词
杨树
地膜覆盖
土壤微生物
土壤酶活性
微生物量碳
活跃微生物量
poplar
plastic fi.lm mulching
soil microbe
soil enzyme activity
microbial biomass carbon
active microbial biomass
