WANG Yueling,WANG Sicheng,XU Hao,et al.Distribution Characteristics of Understory Vegetation Root in the Typical Forests in Loess Region of Southern Ningxia[J].Northern Horticulture,2023,(05):69-76.[doi:10.11937/bfyy.20222321]
宁南黄土区典型林分林下草本植被根系分布特征
- Title:
- Distribution Characteristics of Understory Vegetation Root in the Typical Forests in Loess Region of Southern Ningxia
- Keywords:
- loess region of Southern Ningxia; forest land; herb roots; root length density; root surface area density
- 文献标志码:
- A
- 摘要:
- 以宁南黄土区彭阳中庄小流域4种典型林分（山杏林、山桃林、山杏柠条林、山杏沙棘林）林下草本植被为研究对象，通过采用样方-根钻法和Win RHIZO根系分析系统对不同林地0~30 cm土层的草本根系生物量和分布特征进行了定量分析，以期揭示宁南黄土区不同人工林下草本根系分布特征，为研究区生态恢复和林分配置提供参考依据。结果表明：各林地草本总生物量、总根长密度和总根系表面积密度均表现出山杏柠条和山杏沙棘混交林较大，山杏林和山桃林较小且相差不大。根系参数主要分布于0~10 cm，随着土壤深度的增加各指标均呈现递减的趋势。0~30 cm土层不同径级的根长密度和根表面积密度基本以0～0.5 mm径级的根系分布最广，0～2 mm径级的细根所占比例较大，且随着根系直径的增加二者基本呈现下降趋势。不同土层不同径级的根长密度基本表现为0～0.5 mm＞0.5～1 mm＞1～2 mm＞2～3.5 mm＞3.5 mm。总体反映出混交林林下草本植被各根系参数相较于纯林在土壤表层占比均较高，能够有效改善表层土壤结构，提高土壤抗侵蚀性能。
- Abstract:
- Taking the herbaceous vegetation under four typical forest types (Prunus armeniaca forest,Prunus armeniaca forest,Prunus armeniaca×Caragana korshinskii forests,Prunus armeniaca×Hippophae rhamnoides forests in Zhongzhuang small watershed of Pengyang in loess area of Southern Ningxia as research object,the root biomass and distribution characteristics of herbaceous roots in 0-30 cm soil layers of different woodlands were quantitatively analyzed by means of quadrat and root drilling method and Win RHIZO root analysis system,in order to reveal the distribution characteristics of herbaceous root system under different artificial forests in the loess region of south Ningxia,and to provide reference for ecological restoration and stand allocation in the study area.The results showed that the total biomass,total root length density and total root surface area density of the four forests showed that the mixed forest of Prunus armeniaca,Caragana korshinskii and Hippophae rhamnoides were larger than the pure forest of Prunus armeniaca and Prunus davidiana.The root parameters of each woodland were mainly distributed in 0-10 cm.With the increase of soil depth,the indexes showed a decreasing trend.The root length density and root surface area density of different diameter classes in 0-30 cm soil layer of four kinds of stands were basically the most widely distributed in 0-0.5 mm diameter class,and the proportion of fine roots in 0-2 mm diameter class was larger,and they basically showed a downward trend with the increase of root diameter.The root length density of different soil layers and diameter classes in each forest land was 0-0.5 mm>0.5-1 mm>1-2 mm>2-3.5 mm>3.5 mm.The root diameter.In conclusion,the proportion of root parameters in the soil surface of mixed forest was higher than that of pure forest,indicating that the mixed restoration model of stand played a positive role.
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备注/Memo
第一作者简介：王月玲（1980-）,女,硕士,副研究员,现主要从事黄土高原水土保持与生态环境建设等研究工作。E-mail:wylnxnky@163.com.基金项目：宁夏区农业科技自主创新资金资助项目（NGSB-2021-14-02）；宁夏重点研发资助项目(2020BCF01001)；宁夏区自然科学基金资助项目（2022AAC03422）；中央财政林业科技推广示范资助项目（2020ZY08）。收稿日期：2022-06-06