摘要
以叶尔羌河流域荒漠河岸林胡杨(Populus euphratica Oliv.)为研究对象,比较了胡杨叶片和凋落叶及不同类型叶片间C、N和P的生态化学计量特征差异,并对N和P的再吸收率及其与叶片和凋落叶N和P含量的相关性进行了分析。结果表明:胡杨叶片C、N和P含量的均值(分别为404.00、43.75和0.81 mg·g^(-1))均大于凋落叶(分别为373.45、42.83和0.78 mg·g^(-1));叶片C/N比、C/P比和N/P比的均值(分别为10.50、511.49和56.15)也均大于凋落叶(分别为8.12、492.72和54.90),其中,叶片C含量的均值显著(P<0.05)大于凋落叶,而叶片与凋落叶其他5个生态化学计量指标的均值均无显著差异。披针形、卵圆形和阔卵形叶片C、N和P含量的均值分别为399.03~408.76、37.12~47.60和0.78~0.84 mg·g^(-1),C/N比、C/P比和N/P比的均值分别为8.68~13.92、495.19~533.32和52.05~62.11;其中,阔卵形叶片C和N含量的均值均最大,卵圆形叶片P含量的均值最大,披针形叶片C、N和P含量的均值均最小,披针形叶片C/N比和C/P比的均值均最大,阔卵形叶片N/P比的均值最大;阔卵形叶片与披针形叶片N含量的均值差异显著,3类叶片其他5个生态化学计量指标的均值均无显著差异。胡杨叶片和凋落叶C含量的变异系数均最小,表明胡杨叶片中C含量相对稳定;在3类叶片中,披针形叶片C、N和P含量及C/P比、C/N比和N/P比的变异系数均最大,表明披针形叶片的生态化学计量特征变幅较大。胡杨叶片N和P再吸收率分别为2.10%和3.70%;N再吸收率与凋落叶N含量呈显著负相关,N再吸收率与叶片N含量呈不显著负相关,P再吸收率与叶片和凋落叶P含量均呈不显著正相关。综合分析结果显示:叶尔羌河流域荒漠河岸林胡杨叶片和凋落叶及3类叶片间的生态化学计量特征差异明显,根据生态化学计量特征推测该区域胡杨生长主要受到P元素限制;胡杨凋落叶的分解速率较为缓慢,导致其N和P的再吸收能力�
Taking Populus euphratica Oliv.from desert riparian forest in Yarkant River Basin as the research object,the differences in ecological stoichiometric characteristics of C,N and P between leaf and litter leaf and among different types of leaves of P.euphratica were compared,and the reabsorption rates of N and P and their correlations with N and P contents in leaf and litter leaf were analyzed.The results show that the averages of C,N and P contents in leaf of P.euphratica(which are 404.00,43.75 and 0.81 mg·g^(-1),respectively)are larger than those in litter leaf(which are 373.45,42.83 and 0.78 mg·g^(-1),respectively);the averages of C/N ratio,C/P ratio and N/P ratio of leaf(which are 10.50,511.49 and 56.15,respectively)are also larger than those of litter leaf(which are 8.12,492.72 and 54.90,respectively),in which,the average of C content in leaf is significantly(P<0.05)larger than that in litter leaf,while there is no significant difference in the averages of other five ecological stoichiometric indexes between leaf and litter leaf.The averages of C,N and P contents in lanceolate,oval and broad-ovate leaves are 399.03-408.76,37.12-47.60 and 0.78-0.84 mg·g^(-1),respectively,and those of C/N ratio,C/P ratio and N/P ratio are 8.68-13.92,495.19-533.32 and 52.05-62.11,respectively;in which,the averages of C and N contents in broad-ovate leaf are the largest,the average of P content in oval leaf is the largest,the averages of C,N and P contents in lanceolate leaf are the smallest,the averages of C/N ratio and C/P ratio of lanceolate leaf are the largest,and the average of N/P ratio of broad-ovate leaf is the largest;there is a significant difference in the average of N content between broad-ovate leaf and lanceolate leaf,while there is no significant difference in the averages of other five ecological stoichiometric indexes among three types of leaves.The coefficients of variation of C content in leaf and litter leaf of P.euphratica are the smallest,indicating that the C content in leaf of P.euphratica is relatively
作者
王晶
殷飞
林宁
WANG Jing;YIN Fei;LIN Ning(Kashi University College of Chemistry and Environmental Science,Kashi 844006,China;Kashi University Xinjiang Biomass Solid Waste Resources Technology and Engineering Center,Kashi 844006,China)
出处
《植物资源与环境学报》
CAS
CSCD
北大核心
2021年第5期42-49,共8页
Journal of Plant Resources and Environment
基金
新疆维吾尔自治区自然科学基金面上项目(2019D01A03)。
关键词
叶尔羌河流域
胡杨
凋落叶
生态化学计量特征
养分再吸收率
Yarkant River Basin
Populus euphratica Oliv.
litter leaf
ecological stoichiometric characteristics
nutrient reabsorption rate
