Response of Radial Growth of Populus euphratica to Runoff in the Tarim River

doi:10.11983/CBB17212

Abstract

Abstract: Taking the Populus euphratica forest in the main stream of the Tarim River as the research object, the two sections of the Puman reservoir and Kanbaierwusitan were selected to analyze the characteristics of the radial growth of P. euphratica in the middle reaches of the upper reaches of the Tarim River. The runoff data from cross sections were selected and the response of the radial growth of P. euphratica to the dynamic change of runoff was studied by wavelet analysis and correlation analysis. In the Puman reservoir-Xinqiman section, the basal area increment (BAI) for P. euphratica and the runoff scale all oscillated in a 15-24 year time, and the year of the runoff concussion was earlier than the BAI oscillation year. In the Kanbaierwusitan-Yingbazha section, the BAI for P. euphratica and the runoff scale all oscillated in a 10-20 year time, and the year of the runoff concussion was earlier than the BAI oscillation year. In the main stream of the Tarim River, runoff was one of the main factors limiting the radial growth of P. euphratica. The BAI for P. euphratica was significantly correlated with runoff from November of the previous year to March of this year. In the midstream of the Tarim River, The BAI for P. euphratica was significantly correlated with the runoff from December of the previous year to March of this year. The sensitivity of P. euphratica BAI to runoff variation in different sections of Tarim River differed. In the upstream sampling area of the Tarim River, a reasonable runoff reached 1.334 0×10⁸m³, and P. euphratica grew well. The range of optimal radial flow of P. euphratica growth in the sampling area was 0.380 3×10⁸-1.205 6×10⁸m³ in the middle reaches of the Tarim River.

Key words: reasonable runoff, sensitivity, basal area increment, upper and middle reaches of the Tarim River

Gou Xiaoxia, Ye Mao, Wang Liangliang, Gou Xiaohong. Response of Radial Growth of Populus euphratica to Runoff in the Tarim River[J]. Chinese Bulletin of Botany, 2018, 53(6): 801-811.

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URL: https://www.chinbullbotany.com/EN/10.11983/CBB17212

https://www.chinbullbotany.com/EN/Y2018/V53/I6/801

Figures/Tables 10

Figure 1 Overview of study area

Table 1 Main characteristic parameters of tree-ring at sample points

	Elevation (m)	Distance from river (reservoir) (m)	Number of samples	Standard deviation between samples
Puman reservoir	948	250	34	0.278
Kanbaierwusitan	914	200	32	0.187

Figure 2 The trend of annual runoff in the upper and middle reaches of the Tarim River

Figure 3 The ring width variation trend of Populus euph- ratica(A) Puman reservoir; (B) Kanbaierwusitan

Figure 4 The variation trend of basal area increment (BAI) of Populus euphratica

Figure 5 Morlet map of Populus euphratica basal area increment (BAI) (A) Puman reservoir; (B) Kanbaierwusitan

Figure 6 Morlet map of Populus euphratica runoff(A) Xinqiman; (B) Yingbazha

Figure 7 Correlation between radial growth of Populus euphratica and annual runoff

Figure 8 The relationship between radial growth of Populus euphratica and runoff (A) Puman reservoir; (B) Kanbaierwusitan

Figure 9 Sensitivity curve of radial growth variation of Popu- lus euphratica (A) Puman reservoir; (B) Kanbaierwusitan

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