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基于氢氧稳定同位素浑善达克沙地人工种植杨树吸水来源和耗水耦合研究

发布时间:2018-04-29 02:20

  本文选题:浑善达克沙地 + 氢氧稳定同位素 ; 参考:《内蒙古农业大学》2017年硕士论文


【摘要】:本文以内蒙古浑善达克沙地南缘地带人工种植杨树林为研究对象,基于氢氧稳定同位素示踪的技术,从定性与定量的角度对2015.04~2016.10年杨树生育期内植物的主要水分来源进行分析,确定杨树独特的水分利用模式;同时利用热扩散茎流计与气象站长期监测植株树干液流量与周围相关环境因子,并基于双涌源模型计算杨树生育期的蒸腾量;结合分析当地生态系统中杨树的的水分循环与植被的吸耗水机理,明确其在不同生态环境的应对机制,为实现干旱半干旱地区水资源的优化配置、恢复当地的生态环境和可持续发展提供理论依据,主要研究结果如下:(1)从不同时间尺度对不同水体(大气降水、土壤水、地下水以及植物水)氢氧同位素组成,降水氢氧同位素特征的环境效应和季节效应等进行分析并分别拟合该地区2015、2016两年大气降水线(δ D=7.385δ18O+3.0097、δ D=7.61δ18O+2.5011),斜率全部小于全球降水线方程的斜率。(2)基于多源线性混合模型,利用氢氧稳定同位素示踪技术,通过直观做图对比杨树茎干水分的δ18O稳定同位素和各可能水分来源的δ18O稳定同位素进而定性判断杨树的主要吸水层位。并对杨树生育期内各潜在水源对的水分贡献率,通过Isosource软件进行定量计算。并由此总结出的杨树水分利用模式,从而研究杨树对其生长环境的应对机制。(3)根据研究期内杨树的生理特征以及其他环境因子测量值(前期降水量值、LAI、土壤含水量以及地下水位),结合杨树根系的水分利用模式,利用SPSS软件进行回归分析,定量分析出相对应影响因素对该水源贡献率变化造成的影响。(4)基于能量平衡和微气象学方法,根据当地气象数据和杨树的生理生态特征的实测数据,利用双涌源模型模拟计算杨树的冠层耗水量,从而得出人工种植杨树在其生育期内耗水量为343.92mm,利用测耗水量对其进行有效性检验。(5)结合杨树在生育期的吸耗水以及降水分布情况,定性与定量分析杨树在生育期内蒸腾耗水当地降水与之间的水量平衡;并分析植物的蒸腾作用与土壤水调蓄水分之间的相互作用;通过量化不同月份杨树对各潜在水源的利用量,进而分析蒸腾作用对杨树根系吸水来源选择的影响,最后得出杨树根系在干旱环境下的动态反应机制。
[Abstract]:In this paper, the artificial planted poplar forests in the southern margin of Hunshandake Sandy Land in Inner Mongolia were studied. Based on the technique of hydrogen and oxygen stable isotope tracing, the main water sources of poplar during the growing period of 2015.04 ~ 2016.10 were analyzed qualitatively and quantitatively. To determine the unique water use model of poplar, to use heat diffusion stem flow meter and weather station to monitor the sap flow and environmental factors, and to calculate the transpiration of poplar growth period based on double surge source model. In order to realize the optimal allocation of water resources in arid and semi-arid areas, the water cycle of poplar and the mechanism of water absorption and consumption of vegetation in local ecosystem are analyzed, and the coping mechanism of poplar in different ecological environment is clarified. Restoring the local ecological environment and providing the theoretical basis for sustainable development. The main results are as follows: 1) hydrogen and oxygen isotopic compositions of different water bodies (atmospheric precipitation, soil water, groundwater and plant water) from different time scales. The environmental effects and seasonal effects of hydrogen and oxygen isotopic characteristics of precipitation in the region were analyzed and fitted for the two years of 2015 and 2016, respectively. The precipitation lines (未 DX 7.385 未 18O 3.0097, 未 DU 7.61 未 18O 2.5011g, slope less than the slope of the global precipitation line equation, respectively) are based on a multi-source linear mixed model. By using hydrogen and oxygen stable isotope tracer technique, the 未 18O stable isotopes of poplar stem water and the 未 18O stable isotopes of various possible water sources were compared and the main absorbent layers of poplar were judged qualitatively. The water contribution rates of potential water sources during poplar growth period were calculated quantitatively by Isosource software. And thus concluded the poplar water use model, Therefore, the response mechanism of poplar to its growth environment was studied. (3) according to the physiological characteristics of poplar and other environmental factors (early precipitation value, soil water content and groundwater level), the model of poplar root water use was combined. Based on the energy balance and micrometeorology method, based on the local meteorological data and the measured data of the physiological and ecological characteristics of poplar, the effect of the corresponding factors on the variation of the contribution rate of the water source was quantitatively analyzed by using the SPSS software. The water consumption in the canopy of poplar was simulated by using double surge source model. It is concluded that the water consumption of poplar planted artificially is 343.92 mm during its growing period, and the availability of poplar is tested by measuring water consumption. Qualitative and quantitative analysis of poplar transpiration water consumption in the growth period and water balance between the local precipitation and analysis of plant transpiration and soil water storage interaction; By quantifying the potential water use of poplar in different months, and then analyzing the influence of transpiration on the selection of water absorption source of poplar roots, the dynamic response mechanism of poplar roots in arid environment was obtained.
【学位授予单位】:内蒙古农业大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:S792.11

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