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生态学杂志 ›› 2021, Vol. 40 ›› Issue (3): 672-679.doi: 10.13292/j.1000-4890.202103.006

• 研究报告 • 上一篇    下一篇

不同海拔云南松林土壤养分及其生态化学计量特征

董廷发*   

  1. (西南野生动植物资源保护教育部重点实验室, 西南山地特色植物种质适应与利用研究所, 西华师范大学生命科学学院, 四川南充 637009)
  • 出版日期:2021-03-10 发布日期:2021-03-15

Soil nutrients and their ecological stoichiometry of Pinus yunnanensis forest along an elevation gradient.

DONG Ting-fa*   

  1. (Key Laboratory of Southwest China Wildlife Resources Conservation, Ministry of Education, Institute of Plant Adaptation and Utilization in Southwest Mountains, College of Life Sciences, China West Normal University, Nanchong 637009, Sichuan, China)
  • Online:2021-03-10 Published:2021-03-15

摘要: 以云南东北部不同海拔云南松天然次生林为研究对象,比较不同海拔土壤有机碳(C)、全氮(N)、全磷(P)、全钾(K)、碱解氮(AN)、有效磷(AP)、速效钾(AK)及其化学计量特征。结果表明:海拔间土壤C、N、P、K、AN、AP、AK的值分别为7.85~31.61 g·kg-1、1.08~2.11 g·kg-1、0.19~1.41 g·kg-1、3.65~15.10 g·kg-1、51.33~144.35 mg·kg-1、0.56~2.42 mg·kg-1、0.03~0.35 g·kg-1;随海拔的升高,土壤C、N、P、P∶K、C∶N均主要呈现先升高后降低的趋势,而C∶P、N∶P呈现的趋势与C∶N相反;土壤C与N、AN、AP、AK、C∶N、C∶P、C∶K、N∶K、P∶K均呈显著正相关,而与K含量呈显著负相关。研究表明,该地区云南松林土壤主要养分及其化学计量特征随海拔变异明显,总体上表现为少氮低磷。土壤养分在中海拔处偏高,这与中海拔地段云南松较好的生长表现相符。这些结果可为解析云南松的生长和分布提供一定的基础。

关键词: 土壤养分, 生态化学计量学, 海拔, 云南松

Abstract: I compared the differences in the contents and stoichiometry of soil organic carbon (C), total nitrogen (N), total phosphorus (P), total potassium (K), available nitrogen (AN), available phosphorus (AP), and available potassium (AK) in Pinus yunnanensis secondary forest along an elevation gradient in northeast Yunnan. Results showed that (1) the concentrations of C, N, P, K, AN, AP, AK among elevations ranged 7.85-31.61 g·kg-1, 1.08-2.11 g·kg-1, 0.19-1.41 g·kg-1, 3.65-15.10 g·kg-1, 51.33-144.35 mg·kg-1, 0.56-2.42 mg·kg-1, 0.03-0.35 g·kg-1, respectively; (2) with increases in elevation, soil C, N, P,P∶K, C∶N showed a trend of first increasing and then decreasing, whereas C∶P and N∶P showed an opposite trend; (3) Soil C content was positively correlated with N, AN, AP, AK,C∶N, C∶P, C∶K, N∶K or P∶K, but negatively correlated with K. These results suggest that the main soil nutrients and their stoichiometric characteristics of P. yunnanensis forest in this area varied obviously with altitude, with poor nitrogen and phosphorus status. Nutrient rich soil was found in the middle elevation, which is consistent with the growth performance of P. yunnanensis. Results from this study provide insights for understanding the growth and distribution of P. yunnanensis.

Key words: soil nutrient, ecological stoichiometry, elevation, Pinus yunnanensis.