华西雨屏区巨桉人工林土壤呼吸对模拟氮沉降的响应

doi:10.11707/j.1001-7488.20140104

Abstract

Abstract:

A simulated nitrogen deposition experiment in the field was conducted in a Eucalyptus grandis stand for 14 months. The levels of nitrogen deposition were 0(CK), 5 (L), 15 (M) and 30 (H) g N m^-2·a^-1 respectively. The soil respiration was measured by infrared gas analyzers, and then NH₄NO₃ was added into N-treated plots in the last third of each month. Results showed that: The soil respiration in E. grandis forest displayed an obvious seasonal pattern in the rainy area of western China. The lowest rate occurred in January and the highest rate In July for the all treatments. After 3 months of nitrogen deposition treatment, the soil respiration was promoted significantly, especially in July, the respiration rate of treatment L, M, and H was 8.80%, 22.62%, 32.41% higher than CK, respectively. CO₂ releases from the soil of E. grandis forest were increased by 11.93% to 30.82% after nitrogen deposition treatment. The average soil respiration rate in 24 hour was in an order of CKR_s= aW+b,R_s= ae^bt). The Q₁₀ values were increased correspondingly with the N addition. The result indicated that nitrogen deposition might increase temperature sensitivity of soil respiration.

Key words: nitrogen deposition, Eucalyptus grandis, soil respiration, rainy area of west China

CLC Number:

S718.55

Xiang Yuanbin, Huang Congde, Hu Tingxing, Tu Lihua, Yang Wanqin, Li Renhong, Hu Chang. Response of Soil Respiration to Simulated Nitrogen Deposition in an Eucalyptus grandis Plantation in the Rainy Area of Western China[J]. Scientia Silvae Sinicae, 2014, 50(1): 21-26.

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Response of Soil Respiration to Simulated Nitrogen Deposition in an Eucalyptus grandis Plantation in the Rainy Area of Western China

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