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生态学杂志 ›› 2020, Vol. 39 ›› Issue (10): 3194-3202.doi: 10.13292/j.1000-4890.202010.018

• 研究报告 • 上一篇    下一篇

外源磷添加对西双版纳热带雨林土壤生态化学计量特征的影响

马顺容,林永静,卢同平,武梦娟,刘甜甜,张文翔*   

  1. (云南省高原地理过程与环境变化重点实验室, 云南师范大学地理学部, 昆明 650500)
  • 出版日期:2020-10-10 发布日期:2021-04-09

Effects of exogenous phosphorus addition on soil ecological stoichiometry in Xishuangbanna tropical rainforest.

MA Shun-rong, LIN Yong-jing, LU Tong-ping, WU Meng-juan, LIU Tian-tian, ZHANG Wen-xiang*   

  1. (Yunnan Key Laboratory of Plateau Geographical Process and Environmental Change, Faculty of Geographical Science, Yunnan Normal University,  Kunming 650500, China).
  • Online:2020-10-10 Published:2021-04-09

摘要: 西双版纳热带雨林是我国热带雨林生态系统保存最完整、最典型、面积最大的地区。为探讨磷添加对西双版纳热带雨林土壤生态化学计量碳(C)、氮(N)、磷(P)含量及其生态化学计量比的影响,本研究以西双版纳植物园、瑶区乡、尚勇与纳板河四处原始林区为对象,设置P添加实验。结果表明:西双版纳热带雨林土壤N、P元素更易受外源P输入影响,植物园与瑶区乡、尚勇、纳板河C∶P、N∶P存在显著差异;在P添加下,4个地点因海拔、水热气候条件和微生物活动强弱等不同,土壤养分与计量特征具有不同变化特征;在外源P输入的情况下,西双版纳热带雨林低海拔地区土壤有效P增加,植被吸收P能力增强,土壤N∶P升高,生态系统表现为P限制;而高海拔地区热带雨林中植物和微生物的N吸收增强,凋落物、微生物P释放增加,土壤N∶P降低,生态系统可能转变为N限制。

关键词: 磷添加, 热带雨林, 生态化学计量, 西双版纳

Abstract: Xishuangbanna tropical rain forest (XTRF) is the most intact, typical and largest area of tropical rainforest ecosystem in China. We examined the effects of phosphorus addition on the concentration and stoichiometry of soil carbon (C), nitrogen (N), and phosphorus (P) in XTRF in four sites. The results showed that soil N and P in XTRF were more susceptible to exogenousP input. There were significant differences in C∶P and N∶P between the forest in Botanical〖JP〗 Garden and those forests in Yaoquxiang, Shangyong and Naban River region. Under P addition, soil nutrients and ecological stoichiometry varied greatly across the four sites due to differences in altitude, hydrothermal and climatic conditions, and microbial activity. Under exogenous P input, soil available P and vegetation’s ability to absorb P  increased in low altitude sites, resulting in elevated N∶P in soil, implying P limitation in ecosystems. However, N absorption and P release of plants, litters and microorganisms increased in high altitude sites, with decreased N∶P in soil, indicating that ecosystems may change into N limitation.

Key words: phosphorus addition, tropical rainforest, ecological stoichiometry, Xishuangbanna.