功能多样性比物种多样性更好解释氮添加对高寒草地生物量的影响  

Functional diversity rather than species diversity can explain community biomass variation following short-term nitrogen addition in an alpine grassland

作　　者：董六文 任正炜[2] 张蕊 谢晨笛 周小龙 DONG Liu-Wen;REN Zheng-Wei;ZHANG Rui;XIE Chen-Di;ZHOU Xiao-Long(College of Ecology and Environment,Key Laboratory of Oasis Ecology,Ministry of Education,Xinjiang University,Ürümqi 830046,China;College of Ecology,Lanzhou University,Lanzhou 730000,China;Library of Xinjiang University,Ürümqi 830046,China)

机构地区：[1]新疆大学生态与环境学院,绿洲生态教育部重点实验室,乌鲁木齐830046 [2]兰州大学生态学院,兰州730000 [3]新疆大学图书馆,乌鲁木齐830046

出　　处：《植物生态学报》2022年第8期871-881,共11页Chinese Journal of Plant Ecology

基　　金：新疆维吾尔自治区自然科学基金(2019D01C066);新疆维吾尔自治区天山雪松计划(2020XS26);国家自然科学基金(32060285)。

摘　　要：为进一步了解氮添加条件下群落功能多样性如何驱动生物量变化,该研究在位于天山山脉的巴音布鲁克高寒草地开展氮添加实验,通过连续两年调查群落物种组成并测量常见物种的功能性状,分析物种多样性、功能多样性及群落水平功能性状的响应模式及其在驱动生物量变化中的相对贡献。结果表明,短期氮添加同时增加群落地上和地下生物量,且地上生物量的增加比例高于地下生物量,氮添加导致功能多样性降低但是物种多样性未发生显著变化;氮添加增加群落水平上的植株高度和叶片碳含量,但导致比叶面积、种子质量及叶片磷含量下降;物种多样性对生物量变化解释非常有限,而功能多样性与群落水平功能性状可以很好地解释生物量变化,以上研究结果支持质量比假说。综上,该研究表明功能多样性与群落水平功能性状比物种多样性对短期氮添加的响应更加迅速,且两者在解释高寒草地群落生物量对氮添加的响应中起到关键作用。Aims To further understand how community functional diversity drives biomass change following nitrogen(N)addition,a nitrogen addition experiment was conducted in an alpine grassland.Methods Species composition of community and six functional traits of common species were measured in a short-term N addition experiment in Bayanbulak alpine grassland of Tianshan Mountains.We compared the response patterns of species diversity,functional diversity,and community level traits,and quantified the relative contribution of those factors to community biomass variation.Important findings Both aboveground and belowground biomass increased following short-term N addition,with higher proportional enhancement of aboveground biomass.N addition reduced functional diversity,but did not affect species diversity.At the community level,height and leaf carbon content increased following N addition,whereas specific leaf area,seed mass,and leaf phosphorus content decreased.The variations of species diversity contributed less to the variations of community biomass change,whereas functional diversity and community level traits explained most of the variation of community biomass.Our results support the mass ratio hypothesis.In conclusion,community level functional traits and functional diversity were sensitive to short-term N addition,and played a key role in driving community biomass.

关 键 词：地上生物量 地下生物量 功能性状 功能多样性 物种多样性 氮添加 天山 高寒草地 

分 类 号：S812[农业科学—草业科学]