大氣co2體積分數(shù)升高環(huán)境溫度與土壤水分對農(nóng)田土壤呼吸的影響-資料下載頁
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【正文】 ate in arctic, temperate and tropical soils [J]. Applied Soil Ecology, 2003, 22: 250 220.[29] 馬紅亮, 朱建國, 謝祖彬, 等. 開放式空氣CO2濃度升高對冬小麥P、K吸收和C:N, C:P比的影響[J]. 農(nóng)業(yè)環(huán)境科學(xué)學(xué)報, 2005, 24(6): 11921198.Ma Hongliang, Zhu Jianguo, Xie Zubin, et al. Effects of free air carbon dioxide enrichment on uptake of P, K and m ass ratios of C: N, C: P in winter wheat[J]. Journal of AgroEnvironment Science, 2005, 24(6): 11921198.[30] ROSACKER L L, KIEFT T L. Biomass and adenylate energy charge of a grassland soil during drying [J]. Soil Biology amp。 Biochemistry, 1990, 22: 11211127.[31] SKOPP J, JAWSON M D, DORAN D W. Steadystate aerobic microbial activity as a function of soil water content [J]. Soil Science Society of America Journal, 1990, 54: 16191625.[32] GRAHAMMER K, JAWSON M D, SKOPP J. Day and night soil respiration from a grassland[J]. Soil Biology amp。 Biochemistry, 1991, 23: 7781. [33] 王風玉, 周廣勝, 賈丙瑞, 等. 水熱因子對退化草原羊草恢復(fù)演替群落土壤呼吸的影響[J]. 植物生態(tài)學(xué)報, 2003, 27(5): 644649.Wang Fengyu, Zhou Guangsheng, Jia Bingrui, et al. Effects of heat and water factors on soil respiration of restoring LEYMUS CHINENSIS Steppe in degraded land[J]. Acta Phytoecologica Sinica, 2003, 27(5): 644649.The effects of temperature and soil moisture on soil respiration in the cropland under elevated pCO2Kou Taiji1, 2, Zhu Jianguo2, Xie Zubin2, Liu Gang2, Zeng Qing21. College of Agriculture, Henan University of Science and Technology, Luoyang, 471003, China。 2. Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, ChinaAbstract: The understanding of relationship of soil CO2 efflux and environmental factors (mainly for temperature, moisture) in the plantsoil ecosystem, within increasing atmospheric CO2 concentration context, will be important to evaluate the trend of soil carbon pool in terrestrial ecosystem. A FreeAir Carbon Dioxide Enrichment (FACE) system and rootisolation methods were used to study the effects of elevated pCO2 on soil respiration, rootfree soil respiration and theirs influencing factors, determined by in situ IRGA (LI6400) measurements, during the growth of wheat (Triticum aestivum L. cv Yangmai 14) for two consecutive seasons in a wheat /rice (Oryza sativa L.) rotation system. The effects of temperature and soil water content on soil CO2 efflux were analyzed under elevated pCO2. The results showed that the obvious seasonal variation about soil respiration and rootfree soil respiration was observed, which was consistent with the variation of air and soil temperature. The significant exponential correlations were found both in the soil respiration to temperature and in the rootfree soil respiration to temperature, whereas no significant correlation between soil CO2 efflux and soil water content was observed. Which showed that temperature was the primary factor and soil moisture being the minor factor to the soil CO2 efflux in this experimental area. The interaction of temperature and moisture was nonsignificant. The rootfree soil respiration was influenced more easily by temperature than soil respiration (including roots respiration), and the seasonal variation of soil CO2 efflux could be explained much better by soil temperature than by air temperature. Moreover, elevated pCO2 dropped the exponential correlation coefficient of temperature and soil CO2 efflux and Q10, which suggested that the effect of temperature on soil CO2 efflux reduced under elevated pCO2. However, elevated pCO2 depressed the sensitivity of soil respiration to increment of soil temperature under plant soil ecosystem, which might decrease the deposition of soil carbon and promote the soil carbon sequestration. To sum up, these results will help in evaluating the soil organic carbon sequestration potential under the future higher [CO2] and climate warming scenarios in arable ecosystem. Key words: elevated pCO2。 soil respiration。 rootfree soil respiration。 temperature。 soil moisture。 cropla
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