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以川中丘陵区3年生I-107杨树(Populus×euramericana cv.‘74/76’)人工林为研究对象,通过对丘间平地和丘上坡地两种立地条件样地进行施肥(氮肥+磷肥+农家肥)处理,研究丘间平地和丘上坡地土壤微生物数量、土壤酶活性和土壤养分含量对施肥的响应。结果表明:丘间平地的土壤微生物数量、酶活性、土壤养分含量都高于丘上坡地,除酶活性外其他指标差异均达到显著水平(P<0.05);土壤微生物数量、土壤酶活性和有效养分含量随着土层加深逐渐降低,且不同土层之间差异显著(P<0.05);施肥可显著提高土壤微生物数量、酶活性和养分的含量(P<0.05);施肥与立地条件两者交互作用显著(P<0.05)。从土壤养分供给角度看,在川中丘陵区,平地土壤较坡地更适合种植杨树,在两种立地上施肥均可提高土壤肥力,且在平地更为显著。坡地施肥土壤微生物数量、酶活性、养分含量均高于平地对照,施肥可以在一定程度上弥补地位质量引起的土壤肥力的不足。
Populus × euramericana cv.’74 / 76 ’, a three-year-old poplar plantation in the hilly region of central Sichuan, was used as the study object. + Farmyard manure) to study the responses of soil fertility to the amount of soil microbes, soil enzyme activities and soil nutrient contents in the mound and hillsides. The results showed that the amount of soil microbes, enzyme activity and soil nutrient content in the mound plain were higher than those in the hillside, except for the enzyme activity, the other indexes reached significant levels (P <0.05). The soil microbial quantity, soil enzyme activity and effectiveness Nutrient content decreased with the deepening of the soil layer, and the difference between different soil layers was significant (P <0.05). Fertilization could significantly increase soil microbial quantity, enzyme activity and nutrient content (P <0.05) The interaction was significant (P <0.05). From the point of view of soil nutrient supply, in the hilly area of central Sichuan, plain soil is more suitable for planted poplar than the sloping land. Fertilization on both sites can improve soil fertility and is more significant in the flat. Soil microbial quantity, enzyme activity and nutrient content in the fertilized soil were all higher than those in the plain control, and fertilization could make up for lack of soil fertility caused by the soil quality.