Soil nutrients and microorganisms with simulated acid rain stress and Cryptomeria fortunei litter
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摘要: 采用不同酸碱度（pH 5.6，pH 4.0，pH 3.0）模拟酸雨、不同质量（400，500，600 gm－2）柳杉Cryptomeria fortunei凋落物以及模拟酸雨与凋落物复合处理盆栽柳杉幼苗，研究酸雨和凋落物对根际土壤养分含量和微生物数量的影响。结果表明：酸雨胁迫对土壤养分含量和微生物数量具有显著的影响，酸雨处理降低了土壤养分含量和细菌、放线菌数量，增加了真菌数量，影响程度均为pH 3.0＞pH 4.0＞pH 5.6。随着添加凋落物质量的增加，土壤中氮、磷和钾质量分数以及微生物数量均呈上升趋势，上升程度为600 gm－2＞500 gm－2＞400 gm－2。不同pH值酸雨与凋落物复合处理中，pH 5.6 +500 gm－2 凋落物和pH 4.0 + 500 gm－2凋落物处理对土壤氮、磷和全钾质量分数影响均不显著，速效钾质量分数分别比对照增加了43.1%和24.0%（P＜0.01）；pH 3.0+500 gm－2凋落物处理土壤全氮、碱解氮、全磷和全钾质量分数等分别比对照下降了14.0%，34.3%，30.0%和23.6%（P＜0.01），有效磷质量分数下降了20.3%（P＜0.05）；pH 5.6 + 500 gm－2凋落物处理细菌和放线菌数量分别比对照增加了15.3% 和16.7%（P＜0.05），pH 3.0 + 500 gm－2凋落物处理细菌和放线菌数量分别比对照减少了20.9%和19.4%（P＜0.01）；pH 4.0 + 500 gm－2凋落物和pH 3.0+500 gm－2凋落物处理真菌数量比对照增加了100.91%和119.18%（P＜0.01）。凋落物能够缓解酸雨对土壤养分质量分数和微生物数量的影响。图6参45Abstract: To clearly show the effects of acid rain stress and litter on soil nutrient content and soil microorganism numbers, rhizosphere soil of Cryptomeria fortunei seedlings was tested with combinations of simulated acid rain （pH 3.0, 4.0, and 5.6） and litter （L1-400 gm－2, L2-500 gm－2, and L3-600 gm－2）. Results showed that soil nutrient content and the quantity of bacteria and actinomyces decreased for the acid rain treatment; whereas, fungi increased with pH 3.0 ＞ pH 4.0 ＞ pH 5.6. Also, soil N, P, K, and quantity of microorganisms increased as litter increased （L3 ＞ L2 ＞ L1）. For pH 5.6 + L2 and pH 4.0 + L2 treatments no significant differences in soil N, P, and total K were found, but available K significantly increased （P ＜ 0.01）. With the pH 3.0 + L2 treatment, total N, available N, total P, and total K significantly decreased （P ＜ 0.01） as did available P （P ＜ 0.05）. For the pH 5.6 + L2 treatment, soil bacteria and actinomyces significantly increased （P ＜ 0.05）. With the pH 3.0 + L2 treatment, soil bacteria and actinomyces significantly decreased （P ＜ 0.01）. Also, for pH 4.0 + L2 and pH 3.0 + L2 treatments fungi significantly increased （P ＜ 0.01）. Thus, litter could alleviate the influence of acid rain on soil nutrient content and microbe quantity. ［Ch, 6 fig. 45 ref.］
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Key words:
- forest ecology /
- Cryptomeria fortunei /
- acid rain /
- litter /
- soil nutrient /
- soil microorganisms
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链接本文:
https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2015.02.005
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