CO2 enrichment increases nutrient leaching from model forest ecosystems in subtropical China
CO2 enrichment increases nutrient leaching from model forest ecosystems in subtropical China
复制标题
二氧化碳富集增加了中国亚热带示范森林生态系统的养分淋失
DOI：
10.5194/bg-5-1783-2008
复制
发表时间：
2008-01-01
期刊：
影响因子：
4.9
通讯作者：
Wang, C. L.
中科院分区：
文献类型：
--
作者：
Liu, J. X.;Zhang, D. Q.;Wang, C. L.
高浓度大气CO2对矿质营养动态的影响还没有很好的记录，特别是在中国亚热带地区。我们使用模型森林生态系统中的开顶箱，研究单独的CO2浓度升高，并与N添加对土壤阳离子和阴离子的动态的影响。两年的暴露于700 ppm的CO2大气浓度导致每年的养分流失增加以下70厘米的土壤剖面沥滤。与对照相比，Mg ~（2+）、K ~+、Ca ~（2+）和NO_3 ~--N的净损失分别增加了385%、223%、167%和108%。暴露于CO2浓度升高后的损失增加与矿物/有机物分解的更快风化和更大量的沥滤水有关。在高CO2浓度的温室中，K+、Ca 2+、Mg 2+和NO3--N的年净损失分别达到22.2 kg ha（-1）年（-1）、171.3 kg ha（-1）年（-1）、8.2 kg ha（-1）年（-1）和2 kg ha（-1）年（-1）。单施氮肥对矿质养分淋失量无显著影响。然而，除了N与高CO2处理显着减少矿质营养的损失。我们推测，在中国亚热带的森林可能会遭受养分限制和减少植物生物量在CO2浓度升高，由于矿物淋溶损失在未来。
The effect of high atmospheric CO2 concentrations on the dynamics of mineral nutrient is not well documented, especially for subtropical China. We used model forest ecosystems in open-top chambers to study the effects of CO2 enrichment alone and together with N addition on the dynamics of soil cations and anions. Two years of exposure to a 700 ppm CO2 atmospheric concentration resulted in increased annual nutrient losses by leaching below 70 cm soil profile. Compared to the control, net Mg2+ losses increased by 385%, K+ by 223%, Ca2+ by 167% and NO3--N by 108%, respectively. Increased losses following exposure to elevated CO2 were related to both faster weathering of minerals/organic matter decomposition and greater amounts of leaching water. Net annual nutrient losses in the high CO2 concentration chambers reached 22.2 kg ha(-1) year(-1) for K+, 171.3 kg ha(-1) year(-1) for Ca2+, 8.2 kg ha(-1) year(-1) for Mg2+ and about 2 kg ha(-1) year(-1) for NO3--N. The N addition alone had no significant effect on the mineral nutrient leaching losses. However, addition of N together with the high CO2 treatment significantly reduced mineral nutrient losses. We hypothesize that forests in subtropical China might suffer from nutrient limitation and reduction in plant biomass under elevated CO2 concentration due to mineral leaching losses in the future.