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| Stand structure and height-diameter relationship of a degraded Populus euphratica forest in the lower reaches of the Tarim River, Northwest China |
| AISHAN Tayierjiang1,2, HALIK Ümüt1,2*, Florian BETZ2, TIYIP Tashpolat1, DING Jianli1, NUERMAIMAITI Yiliyasijiang1 |
1 Key Laboratory of Oasis Ecology, College of Resource & Environmental Sciences, Xinjiang University, Urumqi 830046, China;
2 Faculty of Geography and Mathematics, Catholic University of Eichstaett-Ingolstadt, Eichstaett 85071, Germany |
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Abstract Understanding stand structure and height-diameter relationship of trees provides very useful information to establish appropriate countermeasures for sustainable management of endangered forests. Populus euphratica, a dominant tree species along the Tarim River watershed, plays an irreplaceable role in the sustainable development of regional ecology, economy and society. However, as the result of climate changes and human activities, the natural riparian ecosystems within the whole river basin were degraded enormously, particularly in the lower reaches of the river where about 320 km of the riparian forests were either highly degraded or dead. In this study, we presented one of the main criteria for the assessment of vitality of P. euphratica forests by estimating the defoliation level, and analyzed forest structure and determined the height-diameter (height means the height of a tree and diameter means the diameter at breast height (DBH) of a tree) relationship of trees in different vitality classes (i.e. healthy, good, medium, senesced, dying, dead and fallen). Trees classified as healthy and good accounted for approximately 40% of all sample trees, while slightly and highly degraded trees took up nearly 60% of total sample trees. The values of TH (tree height) and DBH ranged from 0–19 m and 0–125 cm, respectively. Trees more than 15 m in TH and 60 cm in DBH appeared sporadically. Trees in different vitality classes had different distribution patterns. Healthy trees were mainly composed more of relatively younger trees than of degraded tress. The height-diameter relationships differed greatly among tress in different vitality classes, with the coefficients ranging from 0.1653 to 0.6942. Correlation coefficients of TH and DBH in healthy and good trees were higher than those in trees of other vitality classes. The correlation between TH and DBH decreased with the decline of tree vitality. Our results suggested that it might be able to differentiate degraded P. euphratica trees from healthy trees by determining the height-diameter correlation coefficient, and the coefficient would be a new parameter for detecting degradation and assessing sustainable management of floodplain forests in arid regions. In addition, tree vitality should be taken into account to make an accurate height-diameter model for tree height prediction.
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Received: 03 December 2014
Published: 10 August 2015
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| Fund: This research was supported by International Science & Tech-nology Cooperation Program of China (2010DFA92720-12), the National Natural Science Foundation of China (31360200), the German Volkswagen Foundation EcoCAR Project (Az88497) and the German Federal Ministry of Education and Research (BMBF) within the framework of the SuMaRiO Project (01LL0918D). |
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| Aishan T, Halik Ü, Cyffka B, et al. 2013. Monitoring the hydrological and ecological response to water diversion in the lower reaches of the Tarim River, Northwest China. Quatenary International, 311: 155–162.Aishan T, Halik Ü, Kurban A, et al. 2015. Eco-morphological response of floodplain forests (Populus euphratica Oliv.) to water diversion in the lower Tarim River, northwest China. Environmental Earth Sciences, 73(2): 533–545.Chen Y N, Zilliacus H, Li W H, et al. 2006. Ground-water level affects plant species diversity along the lower reaches of the Tarim River, Western China. Journal of Arid Environments, 66: 231–246.Chen Y N, Chen Y P, Xu C C. 2010. Effects of ecological water conveyance on groundwater dynamics and riparian vegetation in the lower reaches of Tarim River, China. Hydrological Process, 24: 170–177.Chen Y N, Xu C C, Chen Y P, et al. 2013. Progress, challenges and prospects of eco-hydrological studies in the Tarim river basin of Xinjiang, China. Environmental Management, 51(1): 138–153.Chen Y N, Li W H, Zhou H H, et al. 2014. Analysis of water use strategies of the desert riparian forest plant community in inland rivers of two arid regions in northwestern China. Biogeosciences, 11(10): 14819–14856.Cyffka B, Rumbaur C, Kuba M, et al. 2013. Sustainable management of river oases along the Tarim River, P.R. China (SuMaRiO) and the ecosystem services approach. Geography, Society, Environment, 6(4): 77–90.Grashey-Jansen S, Kuba M, Cyffka B, et al. 2014. Spatio-temporal variability of soil water at three seasonal floodplain sites: a case study in Tarim Basin, Northwest China. Chinese Geographical Science, 24(6): 647–657.Halik Ü, Kurban A, Mijit M, et al. 2006. The potential influence of enbankment engineering and ecological water transfer on the riparian vegetation along the middle and lower reaches of the Tarim River. In: Hoppe T, Kleinschmit B, Roberts B, et al. Watershed and Floodplain Management along the Tarim River in ‘China’s Arid Northwest. Aachen: Shaker, 432.Halik Ü, Chai Z, Kurban A, et al. 2009. The positive response of some ecological indices of Populus euphratica to the emergency water transfer in the lower reaches of the Tarim River. Journal of Rescources Science, 31: 1309–1314. (in Chinese)Hao X M, Li W H. 2014. Impacts of ecological water conveyance on groundwater dynamics and vegetation recovery in the lower reaches of the Tarim River in northwest China. Environmental Monitoring and Assessment, 186(11): 7605–7616.Huang P. 2002. Irrigation-free Vegetation and It’s Recovery in Arid Region. Beijing: Science Press, 15–50. (in Chinese)Huang S M, Stephen J T, Douglas P W. 1992. Comparison of nonlinear height-diameter functions for major Alberta tree species. Canadian Journal of Forest Research, 22(9): 1297–1304.Kuba M, Aishan T, Cyffka B, et al. 2013. Analysis of connections between soil moisture, groundwater level and vegetation vitality along two transects at the lower reaches of the Tarim River, Northwest China. Geo-Öko, 34(1–2): 103–128.Lam T Y, Kleinn C, Coenradie B. 2010. Double sampling for stratification for the monitoring of sparse tree populations: the example of Populus euphratica Oliv. forests at the lower reaches of Tarim River, Southern Xinjiang, China. Environmental Monitoring and Assessment, 175(4): 45–61.Li H K, Fa L. 2011. Height-diameter model for major tree species in China using the classified height method. Scientia Silvae Sinicae, 47(10): 83–90. (in Chinese)Li L P, Anwar M, Wang X P. 2011. Study on relationship between height and DBH of mountain coniferous forests in Xinjiang. Arid Zone Research, 28(1): 47–53. (in Chinese)Ling H B, Xu H L, Fu J Y. 2014. Changes in intra-annual runoff and its response to climate change and human activities in the headstream areas of the Tarim River Basin, China. Quaternary International, 336(26): 158–170.Liu G L, Kurban A, Duan H M, et al. 2014. Desert riparian forest colonization in the lower reaches of Tarim River based on remote sensing analysis. Environmental Earth Sciences, 71(10): 4579–4589.Lu P, Yan G X. 1989. Forest of Xinjiang. Urumqi: The People’s Press of Xinjiang, 226–227. (in Chinese)Maryamgul A, Kurban A, Halik U, et al. 2013. Study on phenological characters of Populus euphratica Oliv. and its relation with the tree diameter. Vegetos, 26(3): 88–92.Peng S H, Chen X, Qian J, et al. 2014. Spatial pattern of Populus euphratica forest change as affected by water conveyance in the Lower Tarim River. Forests, 5(1): 134–152.R Development Core Team. 2013. R: A Language and Environment for Statistical Computing. Vienna: R Foundation for Statistical Computing.Shawn X M, Huang S M, Victor J L, et al. 2008. Wind speed and crown class influence the height-diameter relationship of lodgepole pine: Nonlinear mixed effects modeling. Forest Ecology and Management, 256: 570–577.Si J H, Feng Q, Cao S H, et al. 2014. Water use sources of desert riparian Populus euphratica forests. Environmental Monitoring and Assessment, 186(9): 5469–5477.Song Y D, Fan Z L, Lei Z D, et al. 2000. Research on Water Resources and Ecology of the Tarim River, China. Urumqi: The People’s Press of Xinjiang, 481. (in Chinese)Thevs N, Zerbe S, Schnittler M, et al. 2008. Structure, reproduction and flood-induced dynamics of riparian Tugai forests at the Tarim River in Xinjiang, NW China. Forestry, 81(1): 45–57.Thevs N, Buras A, Zerbe S, et al. 2012. Structure and wood biomass of near-natural floodplain forests along the Central Asian rivers Tarim and Amu Darya. Forestry, 85(2): 193–202.Wang M, Rennolls K. 2005. Tree diameter distribution modelling: introducing the logit logistic distribution. Canadian Journal of Forest Research, 35(6): 1305–1313.Wang S C, Li B H, Li H Q. 1996. Euphrates Poplar Forest. Beijing: China Environmental Sciences Press, 22–27. (in Chinese)Wang X P, Fang J Y, Tang Z Y, et al. 2006. Climatic control of primary forest structure and DBH-height allometry in Northeast China. Forest Ecology and Management, 234: 264–274.Westermann J, Zerbe S, Eckstein D. 2008. Age structure and growth of degraded Populus euphratica floodplain forests in Northwest China and perspectives for their recovery. Journal of Integrative Plant Biology, 50: 536–546.Xu H L, Ye M, Li J M. 2007. Changes in groundwater levels and the response of natural vegetation to transfer of water to the lower reaches of the Tarim River. Journal of Environmental Science, 19: 1199–1207.Yang Y, Yi L. 2014. Spatio-temporal analysis of urbanization and land and water resources efficiency of oasis cities in Tarim River Basin. Journal of Geographical Sciences, 24(3): 509–525.Ye Z X, Chen Y N, Zhang X. 2014. Dynamics of runoff, river sediments and climate change in the upper reaches of the Tarim River, China. Quaternary International, 336(26): 13–19.Yukako M, Naoko M, Ken Y. 2008. Stand structure and regeneration of Populus euphratica forest in the lower reaches of the Heihe River, NW China. Landscape and Ecological Engineering, 4: 115–124.Zhang L. 1997. Cross-validation of non-linear growth functions for modelling tree height-diameter relationships. Annals of Botany, 79: 251–257. |
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