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[1]WANG Yun-ni,XIONG Wei,WANG Yan-hui,et al.Spatial-temporal Pattern of Stable Carbon Isotope Composition of Dominant Tree Species in Liupanshan Mountain[J].Research of Soil and Water Conservation,2012,19(03):42-47.

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Spatial-temporal Pattern of Stable Carbon Isotope Composition of Dominant Tree Species in Liupanshan Mountain

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 19 Number of periods: 2012 03 Page number: 42-47 Column: Public date: 2012-06-20

Title:: Spatial-temporal Pattern of Stable Carbon Isotope Composition of Dominant Tree Species in Liupanshan Mountain

Author(s):: WANG Yun-ni¹, XIONG Wei¹, WANG Yan-hui¹, CHENG Ji-min², YU Peng-tao¹, XU Li-hong¹, HE Cong³, HAO Jia¹, LI Zhen-hua¹, ZHANG Xiao-bei⁴; 1. Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China;
2. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China;
3. College of Forestry, Guangxi University, Nanning 530005, China;
4. College of Forestry, Agricultural University of Hebei，Baoding, Hebei 071000, China

Keywords:: δ¹³C; canopy; seasonal change; habitat

CLC:: S714.5

DOI:: -

Abstract:: The leaf δ¹³C values of dominant tree species were measured from June to September in 2010 in the south (Xiangshuihe Watershed, semi-humid area) and north (Diediegou Watershed, semi-arid area) of Liupanshan Mountain, Ningxia. The differences in leaf δ¹³C between species and individuals were analyzed, and its seasonal pattern was also determined. The results showed that leaf δ¹³C increased with increase of canopy height of Larix principris-rupprechtⅡ, Betula platyphylla, Pinus tablaeformis, but the leaf δ¹³C in the low canopy of Pinus armandⅡ and Quercus liaotungensis were higher compared with those of the mid-and upper parts in the canopy. The leaf δ¹³C values of species were various in different periods of growing season, being relatively higher δ¹³C in the early stage than that in the middle and late phases. And the characteristics of seasonal pattern in leaf δ¹³C were correlated with water environmental condition of habitat. In the semi-humid area, the leaf δ¹³C of tree species decreased over the time, but in the semi-arid area, the seasonal change in the leaf δ¹³C followed as a ‘high-low-high’ pattern during the growing season. The leaf δ¹³C among individual trees of L. principris-rupprechtⅡ and Hippophae rhamnoides in two different water environmental regions were significantly different, but it was mainly influenced by the seasonal pattern of rainfall in different stages of growing season, semi-arid area with the highest values in dry season (the early and late stage of the growing season) had similar δ¹³C values in rainy season (the medium stage of the growing season) in semi-humid area. It showed that the ability of water use of the same tree species could be improved through long-term adaptation to drought.

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