Chin J Plan Ecolo ›› 2017, Vol. 41 ›› Issue (7): 738-748.doi: 10.17521/cjpe.2017.0088

• Research Articles • Previous Articles     Next Articles

Age of arboreous Tamarix austromongolica and its growth response to environment in Tongde County of Qinghai, China

Ou-Ya FANG1,*(), Heng-Feng JIA2, Hong-Yan QIU1, Hai-Bao REN1   

  1. 1State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, China
    and
    2College of Biology and Pharmacy, China Three Gorges University, Yichang, Hubei 443002, China
  • Received:2017-04-02 Accepted:2017-06-16 Online:2017-08-21 Published:2017-07-10
  • Contact: Ou-Ya FANG E-mail:oyfang@ibcas.ac.cn
  • About author:

    KANG Jing-yao(1991-), E-mail: kangjingyao_nj@163.com

Abstract:

Aims The objectives were to identify the age of the arboreous Tamarix austromongolica in the flood plain area of the Qinghai Plateau and clarify the response patterns of T. austromongolica’s growth to the environmental factors. We focused on social issues about whether the T. austromongolica should be protected and how to protect in the reservoir area of a hydropower station. Methods In this study, arboreous T. austromongolica in both reservoir submerged and non-submerged areas were sampled and measured based on the dendrochronology method. The ages were estimated based on the geometrical characteristics of the pith and the identified age of the inner ring. The correlation and response analysis showed the relationship between T. austromongolica’s growth and environmental factors. Important findings We accurately determined the age and historical growth dynamics of the T. austromongolica with large diameter at breast height (DBH). The results showed a special accretion phenomenon in arboreous T. austromongolica, which accelerated the DBH increasing, i.e. no direct relationship existed between the plants’ DBH and ages of the individuals. Radial growth of T. austromongolica, increased rapidly in the 1970s and 1980s and began to stabilize in the late 1980s, and mainly responded to the runoff in July and August of the Yellow River. Increasing runoff would promote the radial growth of T. austromongolica. The growth of the immaturate plant showed significant negative correlation with the wind speed in the growing season. The results will be of theoretical significance to the formation of the special morphology of the T. austromongolica, and will provide scientific practical guidance in designing the protection schemes.

Key words: Tamarix austromongolica, arboreous, tree ring, runoff, wind speed

Fig. 1

Sampling sites of Tamarix austromongolica in Tongde, Qinghai."

Table 1

Ages of sampling Tamarix austromongolica in Tongde County"

样本号 Sample ID 胸径 DBH (cm) 年龄1) Age1) 最小年龄2)
Minimum age2)
样本号 Sample ID 胸径 DBH (cm) 年龄1) Age 1) 最小年龄2)
Minimum age2)
RG-X01 23.2 28 RG-X27 28.0 25
RG-X02 24.8 36 RG-X28 20.4 23
RG-X03 28.6 34 RG-X29 22.6 22
RG-X04 31.2 35 RG-X30 21.3 19
RG-X05A 132.1 86 RG-X31 21.6 15
RG-X05B 132.1 42 393) RG-X32A 33.7 19
RG-X05C 132.1 31 RG-X33 19.2 22
RG-X05D 132.1 64 RG-X34 25.5 23
RG-X05E 132.1 35 RG-X35 29.6
RG-X06A 105.0 18 RG-X36 36.3 28
RG-X06B 105.0 35 RG-X37 49.7 40
RG-X07 51.3 40 RG-P38 19.7 30
RG-X08 31.5 48 RG-P39 18.5 27
RG-X09A 37.9 28 RG-P40 18.1 39
RG-X10 35.7 32 RG-P41 57.6 115
RG-X11A 104.4 19 BD-X01A 42.3 28
RG-X12A 98.4 39 BD-X02 28.0 24
RG-X13A 69.7 58 BD-X03 29.3 23
RG-X14A 63.0 32 BD-X04 17.2 20
RG-X15A 107.3 86 BD-X05 33.1 52
RG-X16 58.3 86 BD-X06A 89.4 40
RG-X17 43.6 29 BD-X07A 63.0 41
RG-X18 38.2 78 BD-X08A 39.5 41
RG-X19 49.3 23 BD-X09A 65.1 39
RG-X20 37.9 20 BD-X10 45.8 46
RG-X21 42.7 33 BD-X11 30.9 54
RG-X22 28.3 22 BD-X12 37.6 46
RG-X23 26.7 21 BD-X13 22.6 52
RG-X24A 111.7 34 BD-X14 29.0 56
RG-X25A 59.2 24 BD-X15 32.8 45
RG-X26 25.5 24 BD-P16 19.4 38

Fig. 2

Tree ring standard chronologies of Tamarix austromongolicas. BD, Banduo Village; RG, Ranguo Village."

Fig. 3

Correlation and response relationship of Tamarix austromongolica growth to monthly runoff and wind in Banduo Village. Left for the relationship between growth and runoff; Right for the relationship between growth and wind. p in the abscissa indicates the month of the previous year, and the error bars show the 95% confidence intervals."

Fig. 4

Correlation and response relationship of Tamarix austromongolica growth to monthly runoff and wind in Ranguo Village. Left for the relationship between growth and runoff; Right for the relationship between growth and wind. p in the abscissa indicates the month of the previous year, and the error bars show the 95% confidence intervals."

Fig. 5

Moving correlation between Tamarix austromongolica growth and monthly runoff. The values represented by the different colors show the different correlation coefficients."

Fig. 6

Moving correlation between Tamarix austromongolica growth and monthly wind speed. The values represented by the different colors show the different correlation coefficients."

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