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N_0、N_1、N_2、N_3、N_4、N_5〔氮添加水平依次为0、0.5、1.0、2.0、3.0、6.0 g/(m^2·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N_0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.
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/（m^2·a））, N1 （0.5 g/（m^2·a））, N2 （1.0 g/（m^2·a））, N3 （2.0 g/（m^2·a））, N4 （3.0 g/（m^2·a）） and N5 （6.0 g/（m^2·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.
出处
《环境科学研究》
EI
CAS
CSSCI
CSCD
北大核心
2016年第1期52-58,共7页
Research of Environmental Sciences
基金
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)
关键词
化学计量比
氮沉降
毛乌素沙地
油蒿群落
优势植物
stoichiometry
N deposition
the Mu Us Desert
Artemisia ordosica community
dominant species
