| 氮添加对油蒿群落植物叶片生态化学计量特征的影响 |
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| 引用本文： | 张文瑾,张宇清,佘维维,秦树高,冯薇.氮添加对油蒿群落植物叶片生态化学计量特征的影响[J].环境科学研究,2016,29(1):52-58. |
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| 作者姓名： | 张文瑾 张宇清 佘维维 秦树高 冯薇 |
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| 作者单位： | 北京林业大学水土保持学院, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站, 北京 100083 |
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| 基金项目： | 国家自然科学基金项目(31470711)；北京林业大学科学创新计划项目(TD2011-04) |
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| 摘 要： | 为了深入认识荒漠植物对氮沉降的适应和反馈能力,研究了宁夏盐池毛乌素沙地油蒿(Artemisia ordosica)群落内5种优势植物〔油蒿、披针叶黄华(Thermopsis lanceolata)、糙隐子草(Cleistogenes squarrosa)、赖草(Leymus secalinus)、刺藜(Chenopodium aristatum)〕在N0、N1、N2、N3、N4、N5〔氮添加水平依次为0、0.5、1.0、2.0、3.0、6.0 g/(m2·a),以N计〕6个氮添加处理下叶片w(TC)、w(TN)、w(TP)及其化学计量比——C/N〔w(TC)/w(TN)〕、N/P〔w(TN)/w(TP)〕、C/P〔w(TC)/w(TP)〕的变化. 结果表明:①氮添加对油蒿、披针叶黄华叶片w(TC)、w(TN)、w(TP)及其化学计量比无显著影响. ②高氮添加(N5处理)显著增加了糙隐子草、赖草和刺藜叶片w(TN),相对于N0处理时增幅分别约为26%、81%和60%. ③高氮添加显著增加了赖草、刺藜叶片N/P,但显著降低了其叶片C/N,其中,赖草和刺藜叶片N/P相对于N0处理时的增幅分别约为86%和61%,C/N的降幅则分别约为45%和37%. 研究显示,油蒿群落中不同植物种对氮添加的响应存在差异,持续增加的氮沉降很可能会引起油蒿群落物种组成的变化,从而影响油蒿群落的演替.
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| 关 键 词： | 化学计量比 氮沉降 毛乌素沙地 油蒿群落 优势植物 |
| 收稿时间： | 2015/6/24 0:00:00 |
| 修稿时间： | 2015/9/17 0:00:00 |
Effects of Nitrogen Addition on Foliar Ecological Stoichiometric Characteristics of Artemisia ordosica Community |
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| ZHANG Wenjin,ZHANG Yuqing,SHE Weiwei,QIN Shugao and FENG Wei.Effects of Nitrogen Addition on Foliar Ecological Stoichiometric Characteristics of Artemisia ordosica Community[J].Research of Environmental Sciences,2016,29(1):52-58. |
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| Authors: | ZHANG Wenjin ZHANG Yuqing SHE Weiwei QIN Shugao and FENG Wei |
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| Affiliation: | Yanchi Research Station, School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China |
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| Abstract: | Abstract: To further explore the environmental adaptability and feedback ability of desert plants, a nitrogen addition experiment was conducted on five dominant plant species, including Artemisia ordosica, Thermopsis lanceolata, Cleistogenes squarrosa, Leymus secalinus and Chenopodium aristatum, in an A. ordosica community in Yanchi county, Ningxia, located in the southern edge of the Mu Us Desert. Six N addition treatments were designed:N0 (0 g/(m2·a)), N1 (0.5 g/(m2·a)), N2 (1.0 g/(m2·a)), N3 (2.0 g/(m2·a)), N4 (3.0 g/(m2·a)) and N5 (6.0 g/(m2·a)). The total carbon (TC), total nitrogen (TN) and total phosphorus (TP) contents were measured, and C/N, N/P, C/P were estimated in the five dominant species following the six N addition treatments. The results indicated that:1) N addition had little effects on the foliar TC, TN and TP contents and stoichiometric ratios of A. ordosica and T. lanceolata. 2) At high N addition level (N5), the foliar TN contents of C. squarrosa, L. secalinus and C. aristatum significantly increased. Compared with N0, their foliar TN contents increased 26%, 81% and 60%, respectively. 3) At high N addition level, the foliar N/P of L. secalinus and C. aristatum significantly increased, while the foliar C/N decreased significantly. Compared with N0, their foliar N/P increased by 86% and 61%, respectively, while their foliar C/N decreased by 45% and 37%, respectively. The results showed that there were differences in response to N addition between different plant species in the A. ordosica community, and increasing nitrogen deposition might cause changes of species composition in the A. ordosica community and affect the succession of the A. ordosica community. |
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| Keywords: | stoichiometry N deposition the Mu Us Desert Artemisia ordosica community dominant species |
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