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应用生态学报 ›› 2017, Vol. 28 ›› Issue (6): 1793-1800.doi: 10.13287/j.1001-9332.201706.036

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黄土丘陵区草本植物叶片与枯落物生态化学计量学特征

刘洋1, 曾全超1, 安韶山2, 李鑫1, 黄懿梅1*   

  1. 1西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 陕西杨凌 712100
    2西北农林科技大学水土保持研究所, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西杨凌 712100
  • 收稿日期:2016-11-07 发布日期:2017-06-18
  • 通讯作者: *E-mail:ymhuang1971@nwsuaf.edu.cn
  • 作者简介:刘洋,男,1991年生,硕士研究生.主要从事生态环境工程研究.E-mail:Roshanlx@163.com
  • 基金资助:
    本文由国家自然科学基金项目(41671280)和水利部公益性行业专项经费项目(201501045)资助

Ecological stoichiometry of leaf and litter of herbaceous plants in loess hilly and gully regions, China

LIU Yang1, ZENG Quan-chao1, AN Shao-shan2, LI Xin1, HUANG Yi-mei1*   

  1. 1Ministry of Agriculture Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China
    2State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, Shaanxi, China
  • Received:2016-11-07 Published:2017-06-18
  • Contact: *E-mail:ymhuang1971@nwsuaf.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (41671280), and the Public Welfare Industry Research Project of Chinese Ministry of Water Resources (201501045)

摘要: 以黄土高原延河流域森林、森林草原和草原3个植被区的4种典型草本植物达乌里胡枝子、长芒草、铁杆蒿、茭蒿的叶片和枯落物为对象,测定叶片和枯落物中碳(C)、氮(N)、磷(P)、钾(K)含量及其比值,分析草本植物在该区域的养分限制及再吸收规律.结果表明: 4种植物叶片N/P均小于14,生长主要受氮元素含量限制;除达乌里胡枝子外,其他3种植物N、P、K的养分再吸收效率平均值分别为48.7%、32.5%、79.9%.茭蒿和铁杆蒿较高的N、P、K养分再吸收效率和叶片K含量有助于其在水分竞争中占据优势.铁杆蒿枯落物的C/N显著低于长芒草和茭蒿的枯落物,因而更易分解和进行养分循环.这可能是铁杆蒿在3个植被区分布广泛的原因之一.

Abstract: This study was conducted in the forest, forest-steppe and steppe vegetation zones along the Yanhe River Basin, where the leaf and litter samples from four dominant herbaceous plants including Lespedeza davurica, Stipa bungeana, Artemisia sacrorum, Artemisia giraldii were taken. By measuring the concentrations of carbon (C), nitrogen (N), phosphorus (P) and potassium (K), we measured the concentrations and their ratios to explore the limit and resorption of nutrient in the herbaceous plants. The results showed that the leaf N/P of four herbaceous plants was all lower than 14, suggesting their growth was mainly limited by N content. Except for L. davurica, the mean nutrient resorption efficiency of K, N and P in the other three plants was 79.9%, 48.7% and 32.5%, respectively. The higher nutrient resorption efficiency and K concentration in the leaf were beneficial for soil water competition of A. sacrorum and A. giraldii. The litter C/N in A. sacrorum was significantly lower than that in S. bungeana and A. giraldii, which was easy to decompose to benefit the nutrient recycling. This resulted in the wide distribution of A. sacrorum in the three vegetation areas.