宁夏半干旱区柠条锦鸡儿灌木林生长特征
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国家自然科学基金重点项目"气候变化背景下黄土高原土地利用影响径流的空间尺度效应"(41230852); 国家林业局项目"全国沙化典型地区定位监测"


Growth Characteristics of Caragana Korshinskii Shrubbery in Semi-arid Regions of Ningxia Hui Autonomous Region
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    摘要:

    [目的] 揭示柠条锦鸡儿灌木林最大生长潜力,掌握其生长规律与更新过程,为柠条锦鸡儿林资源合理开发利用提供科学依据. [方法] 针对宁夏半干旱区24 a柠条锦鸡儿灌木林生长过程的定位监测资料,用定量分析方法揭示柠条锦鸡儿灌木林生长特征. [结果] (1) 柠条锦鸡儿灌木林的生长变化受水分影响,其变化趋势与土壤水分相吻合,表现为坡下部灌丛生长最好,坡中部次之,坡上部最弱.就坡中上部而言,0—8 m土壤贮水量对柠条锦鸡儿灌木丛生长具有显著影响.生长中期的柠条锦鸡儿灌木林,其分枝数量、地径和地上生物量在不同生长坡位间表现出显著或极显著的差异性,而到生长的后期,随着生长年限的延长柠条生理生态特性发生了较大变化,植株衰老退化严重; (2) 柠条锦鸡儿灌木林生长除受其自身生物学特性支配外,主要受环境因子和生长指标的双重影响,其生物量在坡下部受分枝数的影响,坡中部受分枝数、地径和株高的共同作用,坡上部则受地径、株高和冠幅的影响; (3) 各生长因子均与积温和土壤蒸发量呈极显著的正相关关系,而积温在各生长坡位均为重要影响因子. [结论] 水热条件是影响柠条锦鸡儿灌木林生长的主要限制因子.

    Abstract:

    [Objective] The objective of this study is to clarify the growth rule (i.e. maximum growth potential) and regenerating process of Caragana korshinskii and in order to provide basis for the rational utilization of C. korshinskii. [Methods] We evaluated the 24-years in-situ observation records of growth process of C. korshinskii in the semi-arid regions of Ningxia Hui Autonomous region using quantitative statistical analysis. [Results] (1) The growth of C. korshinskii was mainly impacted by water, especially the soil moisture. The shrubbery at the lower slope always grew better than the ones at the middle and upper slope. Soil water contents at soil layer of 0 m to 8 m in the middle or upper slope significantly influenced the growth of C. korshinskii. During the middle period of C. korshinskii growth, branching numbers, ground diameter and the aboveground biomass varied significantly among different parts of slopes. However, the senescence of plants was severe at the later stage since the physiological and ecological functions of C. korshinskii degraded year by year. (2) Except its biological characters, environmental factors and growth indexes also impacted the growth of C. korshinskii. The biomass at the lower slope was influenced by the numbers of branching. The biomass at the middle slope was impacted by the branching number, ground diameter and the plant height, while ground diameter, plant height and crown width controlled the shrub biomass at the upper slope. (3) All growth indexes were significantly positively related with the cumulative temperature and evaporation. The former was important factor at all parts of slopes. [Conclusion] Hydrothermal conditions are the main limitation factors for the growth of C. korshinskii.

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程杰,刘永辉,田瑛.宁夏半干旱区柠条锦鸡儿灌木林生长特征[J].水土保持通报,2016,36(1):332-336

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  • 收稿日期:2015-05-11
  • 最后修改日期:2015-10-08
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  • 在线发布日期: 2016-04-15
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