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| 基于18O稳定同位素对银川平原北部4种灌木夏季水分利用特征研究 | |
| 引用本文： | 朱林,许兴,赵小红,唐建宁.基于18O稳定同位素对银川平原北部4种灌木夏季水分利用特征研究[J].西北林学院学报,2012,27(4):24-30. |
| 作者姓名： | 朱林 许兴 赵小红 唐建宁 |
| 作者单位： | 1. 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,宁夏银川750021;中国科学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,陕西杨陵712100 2. 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,宁夏银川,750021 3. 吴忠市利通区农业技术推广服务中心,宁夏吴忠,751100 4. 宁夏林业局林业技术推广总站,宁夏银川,750021 |
| 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(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) |
| 摘 要： | 为了分析银川平原北部4种灌木对不同水源的利用特征,测定了20年生多枝柽柳(Tama-rix ramosissima)、3年生多枝柽柳、3年生宁夏枸杞(Lycium barbarum)和3年生四翅滨藜(Atri-plex canescens)木质部水及不同潜在水源稳定氧同位素组成(δ18 O),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δ18 O值存在较大差异,并呈规律性变化。表层(0～5cm)土壤水δ18 O值较井水δ18 O值偏正,说明其受蒸发影响较大。120～140cm土层δ18 O值最正,说明该土层同位素分馏作用最大。140～200cm土壤水受蒸发影响最小,土壤水δ18 O与井水最为接近。3年生多枝柽柳、3年生宁夏枸杞、3年生四翅滨藜的木质部水δ18 O值分别为-8.62‰、-8.64‰和-9.23‰,均比20年生多枝柽柳木质部水δ18 O(-9.40‰)偏正。用Iso-Source软件计算的结果显示20年生多枝柽柳和3年生四翅滨藜对地下水和表层土壤水(0～5cm)的利用程度较高,分别利用11.6%和9.3%的地下水,18.2%和14.6%的表层水。3年生多枝柽柳和3年生宁夏枸杞对40～120cm土层水分利用程度较高,分别为93.8%和92.3%。 |
| 关 键 词： | 稳定氧同位素 银川平原 盐碱地 地下水利用 |
Characteristics of Water Use of Four Bushes Growing in Northern Areas of Yinchuan Plain in Summer Based on the 18O Stable Isotope Analysis |
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| ZHU Lin , XU Xing , ZHAO Xiao-hong , TANG Jian-ning.Characteristics of Water Use of Four Bushes Growing in Northern Areas of Yinchuan Plain in Summer Based on the 18O Stable Isotope Analysis[J].Journal of Northwest Forestry University,2012,27(4):24-30. | |
| Authors: | ZHU Lin XU Xing ZHAO Xiao-hong TANG Jian-ning |
| Institution: | 1.Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in North-western China,Minisry of Education, Ningxia University,Yinchuan,Ningxia 750021,China;2.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Water and Soil Conservation,Chinese Academy of Sciences and Ministry of Water Resources, Yangling,Shaani 712100,China;3.Wuzhong Agricultural Technique Extension Center,Wuzhong,Ningxia 751100,China; 4.Ningxia Forestry Technique Extension Station,Ningxia Forestry Bureau,Yinchuan,Ningxia 750002,China) |
| Abstract: | In order to understand the utilization of different potential water sources for the four bushes i.e.twenty-year-old Tamarix ramosissima,three-year-old T.ramosissima,Lycium barbarum.and Atriplex canescens,in Northern areas of Yinchuan Plain,stable 18O isotope compositions(δ18O) of different potential water sources and xylem water were analyzed to calculate the contribution of different water sources to the growth of different bushes using isotope linear mixing model.The results showed that soil water δ18O in different depths differed regularly.The soil water δ18O value in surface soil profile(0-5 cm) was more positive than that of well water,implying the effect of evaporation on δ18O.The most positive δ18O value found in the profile 120-140 cm indicated the most intense effect of isotopic discrimination in this soil layer.Similar δ18O value to well water was recorded in the soil profile from 140 cm to 200 cm suggesting the least effect of evaporation.The xylem water δ18O values of three-year-old T.ramosissima,L.barbarum and A.canescens,i.e.-8.62‰,-8.64‰ and-9.23‰,respectively,were more positive than that of twenty-year-old T.ramosissima(-9.40‰).According to the calculation result of IsoSource,twenty-year-old T.ramosissima and A.canescens tapped 11.6% and 9.3% groundwater,and 18.2% and 14.6% surface soil water(0-5 cm),respectively.Three-year-old T.ramosissima and three-year-old L.barbarum tapped 93.8% and 92.3% soil water in the profile of 40-120 cm,respectively. |
| Keywords: | stable oxygen isotope Yinchuan Plain saline land groundwater utilization |
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