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荒漠草地植物稳定性氮同位素对水分变化的响应
引用本文:禹朴家,徐海量,王炜,张鹏,赵新风,刘新华,张青青. 荒漠草地植物稳定性氮同位素对水分变化的响应[J]. 干旱区研究, 2012, 29(2): 347-351
作者姓名:禹朴家  徐海量  王炜  张鹏  赵新风  刘新华  张青青
作者单位:中国科学院 新疆生态与地理研究所,新疆 乌鲁木齐 830011; ;中国科学院 东北地理与农业生态研究所,吉林 长春 130012;;中国科学院 研究生院,北京 100049;;中国科学院 阜康荒漠生态研究站,新疆 阜康831505
基金项目:国家重点基础研究发展规划项目973项目,国家自然科学基金
摘    要:水分是影响荒漠地区植被分布的重要因素,近年来,我国西部地区的气候正向暖湿化发展,降水的变化势必会对植物N同位素的吸收、分配产生影响。利用15N标记法,通过不同的增水处理,研究古尔班通古特沙漠南缘标记样地和未标记样地植物N同位素吸收和分配对水分变化的响应,得出以下结论:① 增水处理增加了对土壤水分的补给,显著提高了土壤水分含量;② 未标记样地植物稳定性N同位素的[WTBX]Ndff[WTBZ]值的变化范围为0.39~0.59,其最大值出现在30%增水处理,最小值出现在20%增水处理;③ 氮素标记后,样地植物稳定性N同位素Ndff值明显上升,其变化范围为15.27~31.24。从植物不同部位来看,植物吸收的氮素在植物茎中的分配比例最大,而在根中的分配比例最小。

关 键 词:稳定性N同位素  土壤水分  降水格局  荒漠草地  植物生长  古尔班通古特沙漠  
收稿时间:2011-03-04;

Response of ^15N Isotope in Plant to Water Change in Desert Grassland
YU Pu-Jia,XU Hai-Liang,WANG Wei,ZHANG Peng,ZHAO Xin-Feng,LIU Xin-Hua,ZHANG Qing-Qing. Response of ^15N Isotope in Plant to Water Change in Desert Grassland[J]. Arid Zone Research, 2012, 29(2): 347-351
Authors:YU Pu-Jia  XU Hai-Liang  WANG Wei  ZHANG Peng  ZHAO Xin-Feng  LIU Xin-Hua  ZHANG Qing-Qing
Affiliation:Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;;Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China;;Graduate University, Chinese Academy of Sciences, Beijing 100049, China;; Fukang Station for Desert Ecosystem Observation and Experiment, Chinese Academy of Sciences, Fukang 831505, Xinjiang, China)
Abstract:Soil moisture content is an important factor for the distribution of desert vegetation.Climate warming-wetting trend is becoming more obvious in west China in recent years.The increase of precipitation will inevitably affect the N isotope absorption of plants.In this paper,the response of plant N isotope to soil moisture content change in the labeled and unlabeled sample plots in the southern marginal zone of the Gurbantunggut Desert were studied using the 15N labeling method.The results are as follows:(1) The water increase treatment increased significantly the soil moisture regime and soil moisture content;(2) Ndff in plants in the study area varied in a range from 0.39 to 0.59,its highest value occurred in a treatment case of soil moisture content increased by 30%,and the lowest one was found in a treatment case of soil moisture content increased by 20%;(3) The plant Ndff was increased significantly after applying nitrogenous fertilizer,and it varied in a range of 15.27-31.24.From the perspective of different parts of plant,the proportion of nitrogen absorbed by plant was the highest in stems,and it was the lowest in roots.
Keywords:stable N isotope  soil moisture content  precipitation increase  desert grassland  plant growth  Gurbantunggut Desert
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