摘要
对比分析古尔班通古特沙漠10组大沙鼠(Rhornbomysopimus)洞区和无沙鼠扰动对照区20-30cm土层微生物各类群(真菌、细菌和放线菌)的数量分布,并比较土壤理化性质的差异。结果表明:大沙鼠的活动改变了洞区土壤水肥状况,有利于土壤微生物,尤其是真菌的生长发育。洞区土壤细菌(3.40×10^5±6.79×10^4个/g)、放线菌(7.52×10^4±1.11×10^4个/g)、真菌(5.03×10^3±2.05×10^3个/g)的数量均高于对照区(3.14×105±1.05×10^5个/g,6.04×10^4±1.65×10^4个/g,1.01×100±6.98×100^5个/g),(t=0.67,P〉0.05;t=2.356,P〈0.05;t=5.861,P〈0.01)。大沙鼠洞区20-30cm土壤水分(1.40%±0.47%)、速效P(16.68±5.11mg/kg)和速效K(125.50±24.99mg/kg)含量显著高于对照区(0.90%±0.11%;1.59±0.55mg/kg;81.00±20.82mg/kg),(t=3.276,P〈0.01;t=5.268,P〈0.01;t=4.326,P〈0.01)。而土壤有机质含量(0.11%±0.02%)、全P(0.027%±0.002%)、全K(1.225%±0.053%)含量显著低于对照区(0.14%±0.03%,0.031%±0.004,1.293%±0.047%)(t=2.997,P〈0.01;t=2.857,P〈0.01;t=2.982,P〈0.01)。全N(0.009%±0.002%)和速效N(16.68±5.1lmg/kg)的含量均低于对照区(0.01%±0.003%,16.80±5.15mg/kg),但是差异不显著(t=0.87,P〉0.05;t=0.052,P〉0.05)。
In this paper the analyzed results of 10 soil samples collected at 20-30 cm in depth at the burrow sites of Rhombomys opimus are compared with that of 10 soil samples collected random in the same soil layer in surrounding areas without disturbance of Rhombomys opimus in the Gurbantonggut desert. The results show that the burrow systems of Rhombomys opimus are advantageous to form a favorable environment for the growth and development of microorganism, especially for fungil, because the activity of Rhombomys opimus can change the conditions of soil moisture and nutrients. The quantities of bacteria (3.40 × 10^5 ± 6.79 × 10^4 ind·g^-1 ), actinomycete (7.52 × 10^4 ± 1.11 ×10^4 ind·g^- 1) and fungal colonies (5.03 × 10^3 ± 2.05 × 10^3 ind·g^-1 ) in soil with the burrow systems of Rhombomys opimus are higher than that at the random sites (3.14×10^5±1.05 × 10^5 ind·g^-1, 6.04 × 10^4 ±1.65 × 10^4 ind·g^-1 and 1.01 ×10^3 ±6.98 × 10^2 ind·g^-1 respectively) ( t = 0.67, p 〉 0.05 ; t = 2. 356, p 〈 0.05 ; t = 5. 861, p 〈 0.01 ). Soil moisture content ( 1.40 % ± 0.47% ) and available phosphorus content ( 16.68 ± 5.11 mg·kg^- 1 ) and potassium content in soil ( 125.50 ± 24.99 mg·kg^- 1 ) at the sites with burrow systems are significantly higher than that at the random sites (0.90 % ± 0.11%, 1.59 ± 0.55 and 81.00±20.82 respectively), (t=3.276, p〈0.01; t=5.268, p〈0.01; t=4.326, p〈0.01). Organic matter content (0.11% ±0.02% ), total phosphorus content (0. 027% ± 0. 002% ) and potassium content (1. 225 % ± 0. 053 % ) in soil at the sites with burrow systems of Rkomborrtys opimus are significantly lower than that at the random sites (0.14 % ± 0.03 %, 0. 031% ± 0. 004 and 1. 293 % ± 0. 047% respectively), ( t = 2.997, p〈0.01; t=2.857, p〈0.01; t=2.982, p〈0.01). Similarly, total nitrogen content (0.009% ± 0. 002% ) and available nitrogen content (16.68 ± 5.11 mg· kg^-1) in soil at the sites with burrow syste
出处
《干旱区研究》
CSCD
北大核心
2007年第2期187-192,共6页
Arid Zone Research
基金
中国科学院知识创新工程重要方向项目(KZCX3-SW-343)
中国科学院西部之光项目(20034020)
关键词
大沙鼠
扰动
微生物数量
土壤水分
土壤养分
古尔班通古特
disturbance of Rhornbomys opimus
quantity of microorganism
soil moisture content
soil nutrient content
Gurbantonggut desert.