|Table of Contents|

Growth process of spruce saplings in cutovers adjacent to the timberline in eastern Tibetan Plateau(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
2016 06
Page:
1023-1030
Research Field:
Publishing date:

Info

Title:
Growth process of spruce saplings in cutovers adjacent to the timberline in eastern Tibetan Plateau
Author(s):
ZHOU Yanping1 2 FENG Defeng1 2 LIU Xin1 BAO Weikai1** & BAO Yu3
Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China 2University of Chinese Academy of Sciences, Beijing 100049, China 3Zamtang Forestry Bureau, Aba Tibetan and Qiang Autonomous Prefecture of Sichuan Province, Zamtang 624300, China
Keywords:
high-elevation cutover Picea asperata Mast. artificial restoration shrub islands growth process sapling tree trunk analysis
CLC:
S718.5 : 753
PACS:
DOI:
10.3724/SP.J.1145.2016.03007
DocumentCode:

Abstract:
Individual growth process of saplings in high-elevation region is specially unknown, largely due to a lack of reliable stem analysis methodology for saplings. This study tried to find out a reliable and efficient method of sapling trunk analysis, to explore individual growth process of spruce sapling (tree height < 4 m; age < 25 a) cultivated on cutovers near the alpine timberline, and further to assess the effects of thickets on the height and radial area of spruce saplings of earlywood and latewood. We investigated 26 Picea asperata Mast. saplings and five types of thickets (Salix, Rosa, Spiraea, Lonicera, and Ribes) within < 1 m distance around them on coniferous forest cutovers (alt. 3 500-3 700 m) near alpine timberlines in Zamtang County, Sichuan Province. The height, basal diameter, and crown radius of each of saplings and thickets were measured one by one; the biomass of all spruce saplings was measured for needles, branch, stem and roots. Three saplings were used to develop the optimum trunk analysis method for the spruce saplings, with which we investigated the effect of shrub island types on both height and radial growth processes. The investigation showed the spruce saplings between 15 to 22 year-old were in average 2.23 m high and 6.23 cm in basal radius in the high-elevation forest cutovers nearby timberline in Tibetan Plateau, and their growth process could be divided into three stages: slow growth period below 10 years old, fluctuant growth period between 10 and 15 years old, and accelerated growth period over 15 years old. The treatments indicated that the best section length during trunk analysis for P. asperata saplings was the combination of 10 cm section below 50 cm height and 20 or 30 cm section in the rest upper portion. The thicket coexisting with spruce seedlings on the high-elevation cutovers significantly affected sapling growth. Furthermore the radial growth was affected by the nearby shrub islands more than the height growth; and the earlywood growth area was affected by the shrubs more than the latewood. It was also noted that different thickets presented various impacts on annual increments of height and basal radial area for the spruce sapling across the three growth stages, with Spiraea thickets exerting the weakest negative effect and salix thickets presenting strongest negative effects on the spruce saplings with over 10 years-old. This research confirmed that the best section length during trunk analysis for P. asperata saplings were the combination of 10 cm section below 50 cm high and 20 or 30 cm section in the rest upper portion for saplings with very slow growth in high-elevation region. According to our results, cutting thickets coexisting with spruce saplings when they are 8–10 years old (cultivated for five years) is an effective tending measurement for promoting sapling growth on the high-elevation cutovers adjacent to alpine timberline in the Tibetan Plateau.

References

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Last Update: 2016-12-30