Chin J Plant Ecol ›› 2014, Vol. 38 ›› Issue (12): 1263-1272.DOI: 10.3724/SP.J.1258.2014.00121

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Effects of remnant old-growth trees on other tree stems in a secondary Betula albosinensis- Abies faxoniana forest on the eastern edge of Qinghai-Xizang Plateau, China

LI Mao-Ping1, MIAO Ning1,*(), YU Hong2, MA Jiang-Ming3   

  1. 1Key Laboratory of Bio-resource and Eco-environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610065, China
    2Science and Technology Exploitation and Examination Base of Mentougou District, Beijing 102300, China
    3College of Life Sciences, Guangxi Normal University, Guilin 541004, China
  • Received:2014-05-26 Accepted:2014-11-02 Online:2014-05-26 Published:2015-04-16
  • Contact: MIAO Ning

Abstract:

Aims As one of the biological legacies in degraded forest ecosystems after severe disturbance, remnant trees have many ecological effects in biodiversity maintenance and recovery of ecosystem structure and functioning. This study aims to understand the effects of remnant old-growth trees on other tree stems in a secondary Betula albosinensis-Abies faxoniana forest on the eastern edge of Qinghai-Xizang Plateau, China.

Methods We established a 4 hm 2 forest plot in a sub-alpine Betula albosinensis-Abies faxoniana stand in Miyaluo in western Sichuan, China. The species names, tree heights, diameters at breast height (DBH) (>1.3 m in height), and basal diameters (≥4 years, and ≤1.3 m in height) of all woody stems were recorded and the specific locations of all trees were mapped. Hegyi’s competition index model was used to calculate the competition intensity between remnant old-growth trees and other dominant trees of different size-classes as well as the intra- and inter-specific competition intensity of the two dominant tree species, Abies faxoniana and Betula albosinensis. We used mark correlation functions kd(r) to explore the associations of the remnant old-growth trees with seedlings and saplings of A. faxoniana.

Important findings The value of the inter-specific competition index (Hegyi’s competition index (CI) = 2.484) between B. albosinensis and A. faxoniana was significantly greater (p < 0.05) than the values of the intra-specific competition indices of B. albosinensis (CI = 1.711) and A. faxoniana (CI = 1.548). The value of the competition index between remnant old-growth trees and the small trees of B. albosinensis was largest among the competition indices between the remnant old-growth trees and tree stems of different size-classes. The competition indices between remnant old-growth trees of B. albosinensis and small trees of A. faxoniana, between remnant old-growth trees and small trees of A. faxoniana and between remnant old-growth trees of A. faxoniana and small trees of B. albosinensis did not differ significantly, and were smallest among the competition indices between trees of different size-classes. Saplings of A. faxoniana showed a significantly positive association with remnant old-growth trees of B. albosinensis at scale 14.5-15.5 m, and a significantly negative association with remnant old-growth trees of A. faxoniana at scale 6.5-7.5 m. The seedlings of A. faxoniana showed a spatial independence to remnant old-growth trees of both B. albosinensis and A. faxoniana at all spatial scales (0-100 m).

Key words: Abies faxoniana, Betula albosinensis, competition, effects, Hegyi’s competition index;;, mark correlation functions kd(r), remnant trees, secondary Betula albosinensis-Abies faxoniana forest