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.
作者
何茂松
罗艳
彭庆文
杨思琪
李凯辉
韩文轩
HE Mao-song;LUO Yan;PENG Qing-wen;YANG Siqi;LI Kai-hui;HAN Wen-xuan(Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China;University of Chinese Academy of Sciences,Beijing 100049,China;Research Center for Ecology and Environment of Central Asia,Chinese Academy of Sciences,Urumqi 830011,China;Bayinbuluk Grassland Ecosystem Research Station,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Bayinbuluk 841314,Xinjiang,China)
出处
《应用生态学报》
CAS
CSCD
北大核心
2019年第7期2171-2180,共10页
Chinese Journal of Applied Ecology
基金
新疆自治区高端人才引进计划项目和中国科学院“西部之光”项目资助~~
关键词
荒漠植物
气候因子
植物生活型
C3植物
C4植物
碳
氮
磷
生态化学计量
desert plant
climatic factor
plant life form
C3 plant
C4 plant
carbon
nitrogen
phosphorus
ecological stoichiometry