新疆67种荒漠植物叶碳氮磷计量特征及其与气候的关系
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摘要
荒漠生态系统具有独特的耐旱植物种类和植物化学计量特征.本研究通过系统采集全疆63个荒漠地点的67种植物,探索荒漠植物叶碳、氮、磷(C、N、P)的计量特征及其与气候因子的关系.结果表明:荒漠植物叶C、N和P的平均含量分别为394、18.4和1.14 mg·g~(-1),C∶N、C∶P和N∶P平均值分别为28、419和18.灌木的N含量高于乔木和草本,灌木P含量比草本(乔木)低(高);C3植物叶的C、N、C∶P、N∶P高于C4植物.随年均降水量增加,叶C有先降低后升高的趋势,叶N、P先升高、后降低,叶C∶N、C∶P与叶N、P变化趋势相反,N∶P变化不显著;随年均温升高,叶C先降低后升高,叶N、P降低,C∶N变化不显著,C∶P、N∶P升高.年均降水量对叶片化学计量特征的影响大于年均温度和植物类型.本研究结果将有助于预测全球气候变化背景下的C、N、P元素循环规律的变化,并为干旱区生物地球化学建模提供参考和基础数据.
Desert ecosystem has unique drought-enduring plants and stoichiometric characteristics. We collected leaf samples of 67 plant species from 63 desert sites in Xinjiang, and explored foliar carbon(C), nitrogen(N) and phosphorus(P) stoichiometry and the relationship between leaf nutrient stoichiometry and climatic factors. The results showed that the average content of leaf C, N and P in these plants were 394, 18.4 and 1.14 mg·g~(-1), respectively. The mean values of C:N, C:P and N:P were 28, 419 and 18, respectively. In general, shrubs had higher leaf N content than trees and herbs, while leaf P content was lower(higher) in shrubs than in herbaceous plants(trees). Plants with C3 photosynthesis pathway had higher leaf C, N, C:P and N:P than those with C4 pathway. With increasing mean annual precipitation, leaf C first decreased and then increased, while both leaf N and P showed the opposite trend. Leaf C:N and C:P first decreased and then increased, while leaf N:P changed insignificantly. With increasing mean annual temperature, leaf C first decreased and then increased, and leaf N and P decreased, while leaf C:P and N:P increased. Leaf C:N did not change significantly with mean annual temperature. Mean annual precipitation generally showed stronger control on the variation of leaf nutrient stoichiometry than MAT and plant functional types. These results could help predict responses of the biogeochemical cycling of C, N and P to the global climate changes and provide reference and basic data for biogeochemical modeling in the arid regions.
Desert ecosystem has unique drought-enduring plants and stoichiometric characteristics. We collected leaf samples of 67 plant species from 63 desert sites in Xinjiang, and explored foliar carbon(C), nitrogen(N) and phosphorus(P) stoichiometry and the relationship between leaf nutrient stoichiometry and climatic factors. The results showed that the average content of leaf C, N and P in these plants were 394, 18.4 and 1.14 mg·g~(-1), respectively. The mean values of C:N, C:P and N:P were 28, 419 and 18, respectively. In general, shrubs had higher leaf N content than trees and herbs, while leaf P content was lower(higher) in shrubs than in herbaceous plants(trees). Plants with C3 photosynthesis pathway had higher leaf C, N, C:P and N:P than those with C4 pathway. With increasing mean annual precipitation, leaf C first decreased and then increased, while both leaf N and P showed the opposite trend. Leaf C:N and C:P first decreased and then increased, while leaf N:P changed insignificantly. With increasing mean annual temperature, leaf C first decreased and then increased, and leaf N and P decreased, while leaf C:P and N:P increased. Leaf C:N did not change significantly with mean annual temperature. Mean annual precipitation generally showed stronger control on the variation of leaf nutrient stoichiometry than MAT and plant functional types. These results could help predict responses of the biogeochemical cycling of C, N and P to the global climate changes and provide reference and basic data for biogeochemical modeling in the arid regions.
引文
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[14] Shi G-R (史刚荣),Xing H-T (邢海涛).Eco-anato-mical characteristics of eight tree species in Xiangshan Mountain,Huaibei.Scientia Silvae Sinicae (林业科学),2007,43(3):28-33 (in Chinese)
[15] Cui X-P (崔秀萍),Liu G-H (刘果厚),Zhang R-L (张瑞麟).Comparison of leaf anatomical structure between Salix gordejevii growing under contrasting habitats of Otingdag Sandland and Salix microtachya var.bordensis growing on the lowlands of dunes.Acta Ecologica Sinica (生态学报),2006,26(6):1842-1847 (in Chinese)
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[17] Xiao Y (肖遥),Tao Y (陶冶),Zhang Y-M (张元明).Biomass allocation and leaf stoichiometric cha-racteristics in four desert herbaceous plants during different growth periods in the Gurbantunggut Desert,China.Chinese Journal of Plant Ecology (植物生态学报),2014,38(9):929-940 (in Chinese)
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[22] Li C-J (李从娟),Xu X-W (徐新文),Sun Y-Q (孙永强),et al.Stoichiometric characteristics of C,N,P for three desert plants leaf and soil at different habitats.Arid Land Geography (干旱区地理),2014,37(5):996-1004 (in Chinese)
[23] Ratnam J,Sankaran M,Hanan NP,et al.Nutrient resorption patterns of plant functional groups in a tropical savanna:Variation and functional significance.Oecologia,2008,157:141-151
[24] Ren S-J (任书杰),Yu G-R (于贵瑞),Tao B (陶波),et al.Leaf nitrogen and phosphorus stoichiometry across 654 terrestrial plant species in NSTEC.Environmental Science (环境科学),2007,28(12):2665-2673 (in Chinese)
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[28] Liu B (刘波),Feng J-M (冯锦明),Ma Z-G (马柱国),et al.Characteristics of climate changes in Xinjiang from 1960 to 2005.Climatic and Environmental Research (气候与环境研究),2009,14(7):414-426 (in Chinese)
[29] Erkejan (叶尔克江),Apar (阿帕尔),Yin J-X (尹建新),et al.Characteristic analysis the precipitation in Xinjiang in the past 50 years.Journal of Shihezi University (Natural Science) (石河子大学学报:自然科学版),2011,29(6):1-5 (in Chinese)
[30] He S (何帅),Yin F-H (尹飞虎),Xie H-X (谢海霞).Influencing factors on phosphorus adsorption cha-racteristics of zonal soils in Xinjiang.Xinjiang Agricultural Sciences (新疆农业科学),2017,54(8):1513-1522 (in Chinese)
[31] National Earth System Science Data Sharing Infrastructure (国家地球系统科学数据共享平台).1:1000000 Vegetation Distribution Map of Xinjiang Uygur Autonomous Region [EB/OL].[2017-11-19] (2018-03-03).http://www.geodata.cn (in Chinese)
[32] Resource and Environment Data Cloud Platform (资源环境数据云平台).China Meteorological Background-Annual Average Precipitation Data [EB/OL].[2017-11-19] (2018-03-03).http://www.resdc.cn (in Chinese
[33] Shi J-H (史军辉),Wang X-Y (王新英),Liu M-X (刘茂秀),et al.Stoichiometric characteristics of leaves of Populus euphratica with different stand ages and soil.Arid Zone Research (干旱区研究),34(4):815-822 (in Chinese)
[34] Yang S-Q (杨思琪),Zhao X-J (赵旭剑),Sen D (森道),et al.Leaf C,N and P chemometries and their altitudinal variations in the central Tianshan mountains.Arid Zone Research (干旱区研究),34(6):1371-1379 (in Chinese)
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