华北平原冬小麦农田生态系统通量贡献区

发布时间：2018-05-05 01:40

本文选题：冬小麦农田生态系统 + 涡度相关系统　；参考：《应用生态学报》2017年11期

【摘要】：利用2013—2014年涡度相关系统观测的华北平原冬小麦农田生态系统通量数据,结合通量贡献区模型FSAM,分析华北平原冬小麦农田生态系统通量贡献区的时空分布特点,对比研究不同大气稳定层结条件和生长期内通量贡献区的分布差异.结果表明:在主风风向上,冬小麦整个生育期内大气稳定条件下的通量贡献区范围大于不稳定条件下的贡献区范围.在0°~90°主风风向上,生长初期稳定条件下通量贡献区范围比不稳定条件下大17.8 m左右,生长末期稳定条件下的通量贡献区范围比不稳定条件下大11 m左右.生长初期的通量贡献最大值点位置比生长末期距观测点位置远15 m(大气稳定条件)和12.4 m(大气不稳定条件);通量贡献最大值点在稳定条件下比不稳定条件下距观测点位置远5 m(生长初期)和2.4 m(生长末期).在非主风风向上,当风向为90°~180°时,生长初期和生长末期不同大气条件下的最大通量值分别位于距观测点的67.8、53.4和47.0、30.8 m.当风向为270°~360°时,生长初期和生长末期不同大气条件下的最大通量值位于距观测点的58.8、42和41.1、33.1 m.在整个生育期尺度上,观测塔的通量信息主要来自东北、西南和东南方向,其所占比例分别为35.4%、32.5%和19.4%.冬小麦整个生育期内通量贡献区的主要变化发生在观测点东北方向16.0~173.8 m和西南方向14.7~209 m,通量信息全部来源于农田生态系统.两个典型日期的通量贡献区日变化特征明显,通量贡献区范围随大气稳定条件和风向改变而发生变化.夜晚通量信息全部来源于农田生态系统,白天少部分通量信息来源于居民区和果园.本文的定量化结果可为农田生态系统通量贡献区的研究提供依据.
[Abstract]:Based on the flux data of winter wheat farmland ecosystem observed in North China Plain from 2013 to 2014, the spatial and temporal distribution characteristics of flux-contributing region of winter wheat farmland ecosystem in North China Plain were analyzed by using flux contribution region model (FSAM). The distribution of fluxes in different stable stratification conditions and growing periods was studied. The results showed that the range of fluxes contribution under stable atmospheric conditions was larger than that under unstable conditions during the whole growing period of winter wheat. At 0 掳~ 90 掳main wind, the range of flux contribution region at the initial stage of growth is 17.8 m larger than that under unstable condition, and the range of flux contribution region under stable condition at the end of growth is about 11 m larger than that under unstable condition. The maximum point of flux contribution at the beginning of growth is 15 m (atmospheric stability condition) and 12.4 m (atmospheric instability condition) from the end of growth, and the maximum point of flux contribution is more distant than that under unstable condition. The location of the measuring point is 5 m (early growth) and 2.4 m (late growth). When the wind direction is 90 掳~ 180 掳, the maximum fluxes of different atmospheric conditions are located at 67.8 ~ 53.4 and 47.0 ~ 30.8 m, respectively, in the non-main wind direction of 90 掳~ 180 掳. When the wind direction is 270 掳~ 360 掳, the maximum flux values under different atmospheric conditions are located at 58.842 and 41.1 ~ 33.1 m from the observation point. On the scale of the whole growth period, the flux information of the observation tower mainly comes from northeast, southwest and southeast, the proportion of which is 32.5% and 19.4%, respectively. The main changes of flux-contributing region in winter wheat during the whole growth period occurred at 16.0 ~ 173.8 m northeast of the observation point and 14.7209m southwest of the observation point. The flux information was derived from the farmland ecosystem. The diurnal variation of flux-contribution region in two typical dates is obvious, and the range of flux-contribution region varies with the change of atmospheric stability conditions and wind direction. The flux information of night comes from farmland ecosystem and a little from residential areas and orchards during the day. The quantitative results of this paper can provide the basis for the study of the fluxes contribution area of farmland ecosystem.
【作者单位】：河南大学环境与规划学院;黄河中下游数字地理技术教育部重点实验室;
【基金】：国家自然科学基金项目(U1404401) 河南省高校科技创新团队支持计划项目(161RTSTHN012) 河南大学资源与环境研究所项目(HDZHS-201403);河南大学新兴交叉及特色学科培育项目(XXJC20140003)资助~~
【分类号】：S181;S512.11

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