• ISSN 1008-505X
  • CN 11-3996/S

黄土高原纬度梯度下草本植物生物量的变化及其氮、磷化学计量学特征

李婷, 邓强, 袁志友, 焦峰

李婷, 邓强, 袁志友, 焦峰. 黄土高原纬度梯度下草本植物生物量的变化及其氮、磷化学计量学特征[J]. 植物营养与肥料学报, 2015, 21(3): 743-751. DOI: 10.11674/zwyf.2015.0322
引用本文: 李婷, 邓强, 袁志友, 焦峰. 黄土高原纬度梯度下草本植物生物量的变化及其氮、磷化学计量学特征[J]. 植物营养与肥料学报, 2015, 21(3): 743-751. DOI: 10.11674/zwyf.2015.0322
shu
LI Ting, DENG Qiang, YUAN Zhi-you, JIAO Feng. Latitude gradient changes on herbaceous biomass and leaf N and P stoichiometry characteristics in Loess Plateau[J]. Journal of Plant Nutrition and Fertilizers, 2015, 21(3): 743-751. DOI: 10.11674/zwyf.2015.0322
Citation: LI Ting, DENG Qiang, YUAN Zhi-you, JIAO Feng. Latitude gradient changes on herbaceous biomass and leaf N and P stoichiometry characteristics in Loess Plateau[J]. Journal of Plant Nutrition and Fertilizers, 2015, 21(3): 743-751. DOI: 10.11674/zwyf.2015.0322
shu

黄土高原纬度梯度下草本植物生物量的变化及其氮、磷化学计量学特征

  • 1.

    西北农林科技大学资源环境学院,陕西杨凌 712100;

  • 2.

    中国科学院水利部水土保持研究所,陕西杨凌 712100;

  • 3.

    西北农林科技大学水土保持研究所,陕西杨凌 712100

基金项目: 

国家自然科学基金(41271043,31370455);中国科学院知识创新工程“百人计划”项目;中国科学院知识创新重要方向项目(KZCX2-EW-406)资助。

详细信息
    作者简介:

    李婷(1988—), 女,山东烟台人,硕士研究生,主要从事植物生态学研究。

  • 中图分类号: Q948.1

Latitude gradient changes on herbaceous biomass and leaf N and P stoichiometry characteristics in Loess Plateau

  • 1.

    College of Natural Resources and Environment,Northwest A&F University,Yangling,Shaanxi 712100,China;

  • 2.

    Institute of Soil and Water Conservation,Chinese Academy of Sciences,Yangling,Shaanxi 712100,China;

  • 3.

    Institute of Soil and Water Conservation,Northwest A&F University,Yangling,Shaanxi 712100,China

摘要

    摘要
  • 摘要: 【目的】 植物生物量可以表征植物的生长状况和自然环境的变化动向,化学计量学特征能够反映植物养分含量及养分利用策略,本研究以草本植物生物量和草本植物叶片化学计量学特征为研究对象,探讨黄土高原地区草本植物生物量及其叶片氮、磷化学计量学特征沿纬度梯度的变化规律,为预测黄土高原植物的生长发育前景、生态系统的土壤养分状况、植物营养元素的限制情况提供参考依据。【方法】 以陕西省延安市的富县、甘泉县、安塞县和榆林市的靖边县、横山县和榆阳区为研究区域,测定黄土高原地区草本植物生物量和草本植物叶片氮(N)、磷(P)含量,比较不同纬度梯度下不同植被带的草本植物生物量的大小;利用方差分析将本研究中黄土高原地区草本植物叶片氮、磷含量以及N/P与全球、中国尺度等其他研究结果进行比较,分析黄土高原植物生长中的主要限制元素;利用回归分析阐明不同纬度梯度下草本植物生物量的变化规律及其叶片氮、磷的化学计量学特征。【结果】 1)在35.95～38.36N的纬度范围内,黄土高原不同植被带草本植物生物量的变化范围为9.10～27.59 g/m2,算术平均值为19.45 g/m2,变异系数为30.3% 。4个不同植被带草本植物生物量的大小顺序为草原带＞森林-草原带＞森林带＞草原-荒漠带。且随着纬度的升高,草本植物生物量呈先增加后减少的趋势。2)黄土高原草本植物叶片氮、磷含量和N/P的变化范围分别为18.09～33.17 mg/g、 1.07～1.7 mg/g和15.4～21.6;平均值分别为 25.79 mg/g、1.37 mg/g和18.71, 变异系数分别为17.1%、13.9%和9.94%, 其中草本植物叶片氮的变异系数最高,N/P最低。草本植物叶片氮、磷之间存在显著的相关关系,且随着纬度的升高,草本植物叶片氮、磷含量也随之升高,而N/P随纬度的升高变化不明显。3)黄土高原草本植物叶片氮含量(25.79 mg/g)高于全球尺度的平均氮含量(20.09 mg/g),而草本植物叶片磷含量(1.37 mg/g)低于全球尺度的平均磷含量(1.77 mg/g),因此该地区草本植物具有较高的N/P。【结论】 黄土高原草本植物生物量与纬度存在一定的相关性,且并不是简单的线性相关,其生物量的变化也与植被带的物种组成有关;黄土高原草本植物叶片氮、磷含量与纬度之间存在显著的正相关关系,而N/P与纬度之间没有显著的相关性。与全球尺度相比,黄土高原地区草本植物生长更易受磷限制。
    Abstract: 【Objective】 Plant biomass can give an index to the trends of plant growth conditions and the change of natural environment, stoichiometry can reflect the plant nutrient content and using strategy. Our objective was to examine changes of herbaceous biomass and leaf N and P stoichiometry characteristics along latitudinal gradient in Loess Plateau, and to provide references for the prediction of plant growth and development prospect in Loess Plateau, soil nutrient status of the ecosystem and constraints of plant nutrition elements. 【Methods】 We investigated the herbaceous biomass and leaf N and P contents, and compared the herbaceous biomass amounts of different vegetation zones along the latitudinal gradient in Loess Plateau in Shanxi Province, including Fu County, Ganquan County, Ansai County, Jingbian County and Hengshan County and Yuyang District. One-way analysis and regression analysis were conducted to find main constraints of plant nutrition elements and to examine overall patterns of response of the herbaceous biomass, leaf N and P stoichiometry to latitude. 【Results】 Across the 35.95-38.36N latitude gradient, the range of herbaceous biomass amounts of different vegetation zones in Loess Plateau is from 9.10 to 27.59 g/m2, and the arithmetic mean is 19.45 g/m2 and the coefficient of variation is 30.3%. The herbaceous biomass amounts in the four different vegetation zones are in order of grass zone ＞forest-grass zone ＞forest zone ＞grass-desert zone, and with the increase of latitude, the herbaceous biomass amounts are first increased and then decreased. The leaf N and P stoichiometry characteristics are primarily from 18.08 to 33.17 mg/g for N, from 1.07 to 1.7 mg/g for P and from 15.4-21.6 for the N/P ratio, the arithmetic means are 25.79 mg/g, 1.37 mg/g and 18.71, separately, and the variation coefficients are 17.1%, 13.9% and 9.94% in which the leaf N content is the greatest and the N/P ratio is the lowest. The leaf N and P are closely correlated, and leaf N and P significantly increases with latitude increasing, but the N/P ratios is not. The leaf N content in Loess Plateau is higher than the global average level and the leaf P content in Loess Plateau is lower than the global average level, consequently leading to a higher N/P ratio in Loess Plateau. 【Conclusions】 There is a certain correlation between the herbaceous biomass and latitude, however, that is not a simple linear correlation, and the change of herbaceous biomass is also related with species composition of the vegetation zones. There are obvious correlations between leaf N and P and latitude, while the relationship between the N/P ratio and latitude is not significant. These results demonstrate that the plants are under P limitation in Loess Plateau.
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  • 收稿日期:  2014-07-21
  • 修回日期:  2015-06-25
  • 刊出日期:  2015-05-24

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