| 基于~(18)O稳定同位素的银川平原北部4种灌木夏初水分来源的研究 |
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| 引用本文： | 朱林,许兴,唐建宁.基于~(18)O稳定同位素的银川平原北部4种灌木夏初水分来源的研究[J].福建林业科技,2012(1):28-34. |
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| 作者姓名： | 朱林 许兴 唐建宁 |
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| 作者单位： | 宁夏大学西北退化生态系统恢复与重建教育部重点实验室;中科院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室;宁夏林业局林业技术推广总站 |
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| 基金项目： | 国家自然科学基金项目(31160478);国家“十二五”科技支撑项目课题(2011BAC07B03);教育部科学技术研究重点项目(211195);黄土高原土壤侵蚀与旱地农业国家重点实验室基金课题(10501-287);宁夏自然科学基金项目(NZ1142);宁夏大学科学研究基金项目((E)ndzr09-10) |
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| 摘 要： | 在宁夏西大滩,通过测定不同种类及不同年龄盐生灌木木质部水分及不同潜在水源稳定氧同位素组成(δ18O),应用同位素线性混合模型估算了不同灌木对不同水源的利用率。结果表明:不同深度土壤水δ18O值存在较大差异,并呈现规律性变化,140 cm以上δ18O值波动较大,说明该土壤剖面土壤水δ18O受蒸发与井水灌溉的双重影响;140 cm以下δ18O值连续下降,说明该土壤剖面土壤水δ18O主要受井水影响。20年生多枝柽柳平均利用19.9%的地下水,3年生四翅滨藜平均利用15.5%的地下水,3年生枸杞平均利用15.1%的地下水,3年生多枝柽柳平均利用13.3%的地下水。20年生多枝柽柳对表层土壤水的依赖最低(5%),3年生多枝柽柳对表层土壤水的依赖最高(38.9%)。
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| 关 键 词： | 稳定氧同位素 灌木 水分利用 银川平原 |
Study on the Water Sources of 4 Bushes Based on the 18O Stable Isotope Grew in Yinchuan Plain Northern Area in the Beginning of Summer |
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| ZHU Lin,XU Xing,TANG Jian-ning.Study on the Water Sources of 4 Bushes Based on the 18O Stable Isotope Grew in Yinchuan Plain Northern Area in the Beginning of Summer[J].Journal of Fujian Forestry Science and Technology,2012(1):28-34. |
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| Authors: | ZHU Lin XU Xing TANG Jian-ning |
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| Institution: | 1.Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem of North-western China, Minisry of Education,Ningxia University,Yinchuan 750021,China;2.State Key Laboratory of Soil Erosion and Dryl and Farming of the Loess Plateau,Institute of Water and Soil Conservation, Chinese Academy of Sciences and Ministry of Water Resources,Yangling 712100,Shanxi,China; 3.Ningxia Forestry Technique Extension Station,Ningxia Forestry Bureau,Yinchuan 750002,Ningxia,China) |
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| Abstract: | In northern area of Yinchuan Plain,the stable 18O isotope compositions(δ18O) of different potential water sources and xylem water of saltbush of different ages and kinds were determined to calculate the utilization rate of different water sources for the different bushes using isotope linear mixing model.The result showed that: Soil water δ18O in different depth differed and displayed regularity.Dramatic fluctuation in terms of δ18O value was observed in the soil profile above 140 cm,which could be explained by the double effects of evaporation and well-irrigation.Soil water δ18O value decreased continuously along the soil profile below 140 cm,indicating the sole effect of well water on soil water δ18O was important.20-year-old Tamarix ramosissima Lbd.tapped 19.9% of groundwater,while 3-year-old Atriplex canescens(Pursh) Nutt.,3-year-old Lycium Barbarum L.and 3-year-old Tamarix ramosissima Lbd.tapped 15.5%,15.1% and 13.3% of groundwater,respectively.The 20-year-old Tamarix ramosissima Lbd.showed the lowest dependence on shallow soil water(5%) and on which three-year-old Tamarix ramosissima Lbd.exhibited the highest dependence(38.9%). |
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| Keywords: | stable oxygen isotope shrub groundwater utilization Yinchuan Plain |
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