摘要
采用田间小区试验,研究了小麦秸秆覆盖量(覆盖量为0、250、500、750 kg/(667 m2)等4个处理)对不同植烟土壤微生物数量的影响。结果表明:覆盖量越大,地烟和田烟根际土壤细菌、放线菌和纤维分解菌的数量越大,覆盖量为750 kg/(667 m2)时,采收后,地烟和田烟土壤中细菌、放线菌和纤维分解菌的数量最多,分别比对照增加了112.92%、88.97%、311.87%和176.13%、43.40%、233.85%。地烟不同秸秆覆盖量处理的土壤细菌数量较无秸秆覆盖处理增加了1.81～2.13倍;放线菌增加了1.08～1.89倍;纤维分解菌增加了1.49～4.1倍;固氮菌则在覆盖量为500 kg/(667 m2)时增加的数量最多,显著高于无秸秆覆盖;秸秆覆盖量对真菌的数量也有影响。田烟不同秸秆覆盖量处理的土壤根际细菌数量较无秸秆覆盖处理增加了1.87～2.76倍;放线菌增加了1.12～1.43倍;纤维分解菌增加了1.3～3.39倍;覆盖量为500 kg/(667 m2)时,土壤中真菌和固氮菌的数量最多,分别比无秸秆覆盖增加2.24倍、1.60倍,且差异显著。
Field experiment was conducted to study tile effects of different mulching amount of wheat （the mulching a- mount being 0,250,500,750 kilograln per 667 squarer meter as 4 treatments） on the quantity of microorganisms in differ- ent tobacco planting soil. Result showed that the quantity of bacteria, aetinomycetes and cellulose - decomposing bacteria in rhizosphere soil of the upland and paddy increased with the amount of mulching. And the quantities of them reached biggest in treatment with mulching amount of 750 kilogram per 667 squarer meter after harvest, and were respectively 53.03%, 47.08%, 75.72% and 63.79%, 30. 27%, 69. 08% higher than contrast. The quantity of bacteria in rhizo- sphere soil of the upland in treatments with different mulching amount were 1.81 ^-2. 13 times higher than that without mulching, actinomycetes and cellulose - decomposing bacteria were respectivelyl. 08 - 1.89 and 1.49-4. 1 times higtler. 3＂he quantity of azotobacter were most in treatments with mulching amount of 500 kilogram per 667 squarer meter , and were significantly higher than contrast. There were no effects on the quantity of fungi with straw mulching. The quantity of bac- teria in rhizosphere soil of the paddy in treatments with different mulching amount werel. 87 -2. 76 times higher than that without mulching, actinomycetes and cellulose -decomposing bacteria were respectively 1.12 - 1.43 and 1.3 -3.39 times higher. The quantity of fungi and azotobacter were most in treatments with mulching amount of 500 kilogram per 667 squarer meter,, and were 2. 24 and 1.60 times higher than contrast.
出处
《作物研究》
2012年第6期664-667,共4页
Crop Research
