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林草资源研究 ›› 2023›› Issue (5): 72-79.doi: 10.13466/j.cnki.lczyyj.2023.05.009

• 科学研究 • 上一篇    下一篇

广西不同林龄软阔林细根碳氮磷化学计量和储量特征

连子文1,2(), 黄荣伟3, 杜虎1,2, 曾馥平2, 彭晚霞2, 尹力初1()   

  1. 1.湖南农业大学 资源学院,长沙 410125
    2.中国科学院亚热带农业生态研究所 亚热带农业生态过程重点实验室,长沙 410125
    3.环江毛南族自治县林业和草原局,广西 环江 547100
  • 收稿日期:2023-08-24 修回日期:2023-10-13 出版日期:2023-10-28 发布日期:2023-12-20
  • 通讯作者: 尹力初,教授,博士,主要研究方向:土壤肥力提升。Email:lcyin0418@sohu.com
  • 作者简介:连子文,硕士研究生,主要研究方向:森林生态管理。Email:1549568383@qq.com
  • 基金资助:
    广西自然科学基金项目(2023GXNSFAA026109);国家自然科学基金项目(42071073);中国科学院青年创新促进会项目(2021366)

Fine Root Carbon,Nitrogen and Phosphorus Stoichiometry and Storage in Different Stand Ages of Soft-Broadleaved Forests in Guangxi

LIAN Ziwen1,2(), HUANG Rongwei3, DU Hu1,2, ZENG Fuping2, PENG Wanxia2, YIN Lichu1()   

  1. 1. College of Resources,Hunan Agricultural University,Changsha 410125,China
    2. Key Laboratory of Agro-ecological Processes in Subtropical Region,Institute of Subtropical Agriculture,Chinese Academy of Sciences,Changsha 410125,China
    3. Huanjiang Maonan Autonomous County Forestry and Grassland Bureau,Huanjiang,Guangxi 547100,China
  • Received:2023-08-24 Revised:2023-10-13 Online:2023-10-28 Published:2023-12-20

摘要:

为探索广西各个林龄阶段软阔林细根碳(C)、氮(N)、磷(P)化学计量特征及其储量,以5个龄级典型软阔林为研究样点,采集各样点0~<20 cm土层、20~40 cm土层细根并进行室内测定,研究各林龄阶段下不同土层的软阔林细根C,N,P化学计量特征及其储量的变化规律。结果表明:1)广西软阔林细根C含量随林龄和土层变化不发生显著性变化;细根N,P含量随林龄变化差异显著,最高值均出现在成熟林阶段,最低值分别出现在中龄林和近熟林阶段。2)随林龄的增长,细根C/N出现下降的趋势,C/P和N/P整体上表现为先升后降的趋势。3)软阔林各龄级细根生物量和C,N,P平均储量在0~40 cm土层分布为7.77~12.26 t/hm2,3 324.18~4 974.21 kg/hm2,44.06~103.36 kg/hm2,7.19~13.62 kg/hm2。4)软阔叶林细根生物量和C,N,P储量随土层加深和林龄增长呈下降趋势;软阔林细根生长总体上受到氮元素限制,在软阔林各龄级阶段中均应着重对其氮素进行补充。通过研究,以期为广西软阔林生态系统管理提供参考。

关键词: 林龄, 软阔林, 细根, 化学计量特征, C,N,P储量

Abstract:

The objective of this research was to investigate different stand age classes of fine root carbon(C),nitrogen(N)and phosphorus(P)stoichiometric characteristics and their storages.Five representative soft-broadleaved forests were selected as the research objects.Fine root samples were taken at depth intervals of 0~<20 cm and 20~40 cm soil layers in each sample-plot for indoor measurements.And the variation laws were investigated for different age classes and different soil layers for the fine root C,N,P stoichiometric characteristics and their storages in GuangXi soft-broadleaved forests.The result showed that:1)the C content of fine roots did not have a significant change with the change of forest stand ages and soil layers.The N and P contents of the fine roots differed significantly for different stand ages.While their highest values were both found in mature forest,their lowest values were found in middle-aged and pre-mature forest,respectively.2)As the forest grows older,the C/N of fine roots showed a downward trend,and the C/P and N/P normally showed a trend of first increasing and then decreasing.3)The average distribution of fine root biomass and C,N and P storage in soft broad-leaf forests in Guangxi were 7.77~12.26 t/hm2,3 324.18~4 974.21 kg/hm2,44.06~103.36 kg/hm2,7.19~13.62kg/hm2,respectively.4)The fine root C,N,P storage and biomass of soft-broadleaved forest in Guangxi showed a decreasing trend with the deepening of soil layer and the growth of forest age.Fine root growth in soft-broadleaved forest was generally limited by nitrogen.Nitrogen input should be emphasized in each stand ages of soft-broadleaved forest.

Key words: stand ages, soft-broadleaved forest, fine root, stoichiometric characteristics, carbon, nitrogen and phosphorus storage

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