摘要
以安徽省马鬃岭地区杉木(Cunninghamia lanceolata)人工林叶片为研究对象,测定不同海拔梯度下(750、850、1000、1150m)不同叶龄(当年生、1年生、2年生和3年生)杉木叶片碳氮同位素(δ^13C、δ^15N)以及碳氮磷养分含量,探讨海拔和叶龄对杉木叶片碳氮稳定同位素、叶片碳氮磷元素含量及其计量比的影响机制,从而为不同海拔梯度下杉木人工林的科学经营提供依据。结果表明,海拔对杉木当年生叶片δ^13C含量影响显著(P<0.05),海拔1150m当年生叶片δ^13C含量(-29.40‰)显著高于750m海拔叶片δ^13C含量(-30.49‰),且随着海拔增加当年生叶片δ^13C含量逐渐升高,温度可能是导致这种变化的主要原因,其他叶龄叶片对海拔的响应无显著差异(P>0.05);不同叶龄的叶片δ^13C含量差异不显著(P=0.388)。海拔对杉木叶片δ^15N含量无显著影响(P=0.092),但总体变化趋势与C/P和N/P保持一致;而叶龄对叶片δ^15N含量影响显著(P<0.05),同一海拔不同叶龄叶片之间δ^15N含量均随着叶龄的增加而降低,这可能是氮元素在不同叶龄叶片间的富集效应不同导致的;此外,温度降水和土壤氮磷可能是影响叶片δ^15N含量的重要因素。马鬃岭不同海拔梯度下杉木林氮和磷的限制性不尽相同,海拔750m处的林分呈磷限制(N/P>16),在850m和1150m林分呈现氮磷共同限制(14<N/P<16),而在海拔1000m则呈现氮限制(N/P<14),氮同位素对林分的养分限制响应可能比碳同位素更明显。
In order to reveal the effects of altitude and leaf age on carbon (C), nitrogen (N) and phosphorus (P) contents and their stoichiometric ratios, the δ^13C and δ^15N and C, N and P elements in different aged leaves(current year, 1-year-old, 2-years-old, 3-years-old) of Cunninghamia lanceolata along an altitude gradient (750, 850, 1 000 and 1 150 m) were studied in Mazongling National Forestry Farm, Anhui Province. The research significance is to provide basis for the scientific management of C. lanceolata plantation under different altitude gradients. The results showed that the altitude had a significant effect on the δ^13C content in current foliar year of C. lanceolata (P<0.05). The foliar δ^13C content was significantly higher at 1 150 m (-29.40‰) than 750 m (-30.49‰), And as the altitude increases, the δ^13C content of the foliar increases gradually, temperature may be the main cause, while the foliar age had no significant effect on δ^13C content (P>0.05). On the other hand, altitude had no significant effect while foliar age had significant effect on the foliar δ^15N content of C. lanceolata (P>0.05). But the overall trend of δ^15N was consistent with C/P and N/P. The foliar age had a significant effect on the δ^15N content of the foliar (P<0.05).δ^15N content foliar in of different foliar ages at the same elevation decreased with increasing foliar age. This might be due to the difference in foliar enrichment effects of nitrogen at different foliar ages. In addition, temperature precipitation and soil nitrogen and phosphorus may be important factors affecting the content of δ^15N in foliar. The limitations of N and P weredifferent between altitude gradients. The P limitation appeared at altitude of 750 m (N/P>16), and it was limited by N and P co-limitation occurred at 850 m and 1 150 m (14<N/P<16), while N limitation occurred at 1 000 m (N/P<14). The nitrogen isotope may have more nutrient limitation on the stand than the carbon isotope.
作者
王亮
曹小青
孙孟瑶
李培玺
滕臻
徐小牛
WANG Liang;CAO Xiaoqing;SUN Mengyao;LI Peixi;TENG Zhen;XU Xiaoniu(College of Forestry and Landscape Architecture,Anhui Agricultural University,Hefei 230036,China)
出处
《生态环境学报》
CSCD
北大核心
2019年第9期1776-1784,共9页
Ecology and Environmental Sciences
基金
国家“十三五”重点研发计划项目（2016YFD0600304-03）
国家“973”计划项目（2010CB950602
2012CB416905)
关键词
海拔梯度
叶龄
碳氮同位素
养分计量
杉木人工林
altitude gradient
foliar age
carbon and nitrogen isotopes
nutrient stoichiometry
Cunninghamia lanceolata plantation
