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991.
992.
As the substantial component of the ecosystem respiration, soil CO2 flux is strongly influenced by infrequent and unpredictable precipitation in arid region. In the current study, we investigated the response of soil CO2 flux to rain pulses at a saline desert in western China. Soil CO2 flux was measured continuously during the whole growing season of 2009 at six sites. We found that there were remarkable changes in amplitude or diurnal patterns of soil CO2 flux induced by rainfall events: from bimodal before rain to a single peak after that. Further analysis indicated that there is a significant linear relationship (P < 0.001) between soil CO2 flux and soil temperature (Tsoil). However, a hysteresis between the waveform of diurnal course of CO2 flux and Tsoil was observed: with soil CO2 flux always peaked earlier than Tsoil. Furthermore, a double exponential decay function was fitted to the soil CO2 flux after rainfall, and total carbon (C) releases were estimated by numerical integration for rainfall events. The relative enhancement and total C release, in association with the rain pulses, was linearly related to the amount of precipitation. According to the size and frequency of rainfall events, the total amount of C release induced by rain pulses was computed as much as 7.88 g C·m–2 in 2009, equivalent to 10.25% of gross primary production. These results indicated that rain pulses played a significant role in the carbon budget of this saline desert ecosystem, and the size of them was a good indicator of rain‐induced flux enhancement. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
993.
唐佑民 《成都信息工程学院学报》1991,(1)
本文从能量平衡角度,考虑海气相互作用和纬向间的差异,设计了一个纬向平均的海气耦合一维模式,进行了模式平衡态求解、敏感性试验以及随机分析。并对模式部分计算结果进行了与实测资料的比较,验证了模式的合理性和可信性。 相似文献
994.
分析了1994年4月19~20日春季暴雨主要是由对流层中低层低涡和地面静止锋共同作用的结果,侧重于对低空急流的形成与变动和熵平衡方程的诊断分析,能量场与该次暴雨有很好的相关性 相似文献
995.
996.
B. Straughan 《国际地质力学数值与分析法杂志》2002,26(1):75-97
An accurate computational analysis is presented for the onset of thermal convection in a two‐layer system which is comprised of a saturated layer of porous material described by Darcy's law, over which lies a layer of the same saturating fluid. The two‐layer system is heated from below and the upper (fluid) surface is allowed to be fixed or stress free. The onset of convection may have a bi‐modal nature in which convection may be dominated by the porous medium or by the fluid depending on the depths of the relative layers, but this is strongly controlled by material parameters. The effect of variation of relevant fluid and porous material properties is investigated in detail, as is the effect of the interface boundary condition between the fluid and the porous medium. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
997.
998.
张秋文 《大地测量与地球动力学》1994,(4)
本文在研究长江三峡及邻区地壳─上地幔结构和现今地壳重力场基础上,分析了该区板内中强地震的孕震动力学过程,探讨了整体上相对稳定的长江三峡及邻区孕育和发生中强地震的动力学机制,并提出了该区板内中强地震预测的动力学标志。 相似文献
999.
INTRODUCTION The eonversion of dietary Protein,liPid and earbohydrate in the body of thevertebrate 15 conneeted with the intermediate metabolism Proeesses in whieh themetalloenzymes Play very imPortant roles.Anderson et al.(1984)and Teshimaand Kanazawa(1 986)Proved the maintenanee of ProPer Protein and liPidlevelsin the diets eoneomitant with inereasing the dietary earbohydrate eontent to 40%ean Promote teh growth of Nile tilaPia fingerlings.EI一Sayed and Garling(1988)indi eated th… 相似文献
1000.
VELOCITIES OF PRECURSOR SOLITON GENERATION IN SINGLE LAYER FLOW 总被引:3,自引:0,他引:3
ImODUcrIONThegeneratingveodtyofprecmeorsolitonswasstudiedbyGrimshawetal.(l986),Wu(l987)andbeetal.(1989).TheydidnotgivetherelationbeweenthegeneratingvelocitiesandtopographyintenSityandthereexistSanunknownparameterh,inthetheoryofboetal.(l989),sotheprevioustheorycannotprediCtthegeneratingvelodtAs.ThisfurtherstudyonthetheoryofXuetal.(l996)ahetoconstIUCtatheoryonthegeneratingvefodtiesofsinglelayerflowfondbytopography.InSeCtion2,thernassandenergyoftheprecursorsolitongenerationaredetendnedint… 相似文献