Regulation of microbial carbon, nitrogen, and phosphorus transformations by temperature and moisture during decomposition of Calluna vulgaris litter
Regulation of microbial carbon, nitrogen, and phosphorus transformations by temperature and moisture during decomposition of Calluna vulgaris litter
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DOI：
10.1007/s00374-007-0184-z
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发表时间：
2007-03
影响因子：
6.5
通讯作者：
M. J. Meeteren;A. Tietema;J. Westerveld
中科院分区：
文献类型：
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作者：
M. J. Meeteren;A. Tietema;J. Westerveld
为了评价气候变化对生态系统功能的影响，研究了红芋分解过程中微生物C、N、P转化的温度和水分响应。船体。在实验室培养实验中研究了凋落物。凋落物起源于干燥的石楠在荷兰，P限制植被生长。在全析因设计中，将新鲜垫料在5、10、15或20°C和50、100或200%的含水量下孵育。微生物营养转化和活性进行了评价，在两个连续的时期：一个初始期为48天，其特征在于微生物的生长和第二个时期，从48至206天，其中微生物的生长显着下降。呼吸速率，代谢商（qCO2），C，N，P固定，净N和P矿化和硝化速率的温度和水分响应进行线性回归。微生物养分转化和微生物活性取决于温度和湿度。在第一阶段，温度对呼吸速率、qCO2、微生物C和N固定、净P矿化、净N矿化和净硝化速率的影响较大，而水分对微生物P固定速率的影响较大。呼吸速率、qCO2、P固定速率、P、N净矿化速率和硝化速率随温度和湿度的升高而增大，C、N固定速率随温度的升高而减小，随湿度的升高而增大。在第二阶段，C，N，P固定和净N和P矿化率显着降低。呼吸速率和qCO2随温度和湿度的增加而增加，C和N固定速率随温度的升高而增加，随湿度的增加而降低。在较高的温度和湿度下，净磷矿化速率降低，硝化速率随温度升高而降低，随湿度升高而增加。结果表明，在这些磷限制系统中，植物生长对气候变化非常敏感，因为它强烈依赖于与微生物的磷竞争，温度和湿度对有效磷的固定率有很大影响。
To evaluate the effect of climate change on ecosystem functioning, the temperature and moisture response of microbial C, N, and P transformations during decomposition ofCalluna vulgaris(L.) Hull. litter was studied in a laboratory incubation experiment. The litter originated from a dry heathland in the Netherlands where P limited vegetation growth. Fresh litter was incubated at 5, 10, 15, or 20°C and at a moisture content of 50, 100, or 200% in a full factorial design. Microbial nutrient transformations and activity were evaluated during two successive periods: an initial period of 48 days characterized by microbial growth and a second period from 48 to 206 days in which microbial growth declined significantly. Temperature and moisture response of respiration rate, the metabolic quotient (qCO2), C, N, and P immobilization, net N and P mineralization and nitrification rates were evaluated by performing linear regressions. Microbial nutrient transformations and microbial activity depended both on temperature and moisture. In the first period, the respiration rate,qCO2, microbial C and N immobilization, net P mineralization, net N mineralization and net nitrification rates were more strongly affected by temperature, while the microbial P immobilization rate was more strongly affected by moisture. The respiration rate,qCO2, P immobilization rate, net P and N mineralization rate, and nitrification rate increased with temperature and moisture, while the C and N immobilization rate decreased with increasing temperature and increased with moisture. In the second period, C, N, and P immobilization and net N and P mineralization rates were significantly lower. The respiration rate andqCO2continued to increase with temperature and moisture, but C and N immobilization rates increased with temperature and declined with increasing moisture. Net P mineralization rate decreased at higher temperature and moisture, and nitrification rate declined with increasing temperature and increased with moisture. It was concluded that plant growth in these P-limited systems is very sensitive to climate change as it strongly relies on the competition for P with microbes, and temperature and moisture have a large effect on the immobilization rate of available P.