养分添加对贝加尔针茅草原6种植物叶片性状的影响

doi:10.11686/cyxb2016242

摘要/Abstract

摘要： 养分添加是促进退化草地恢复常用的管理措施。以贝加尔针茅草原为研究对象,设置CK(对照,不施肥),N(单施氮肥,100 kg/hm²),P(单施磷肥,100 kg/hm²),K(单施钾肥,100 kg/hm²),NP(氮、磷肥混施,均为100 kg/hm²),NK(氮、钾肥混施,均为100 kg/hm²),PK(磷、钾肥混施,均为100 kg/hm²),NPK(氮、磷、钾肥混施,均为100 kg/hm²),研究贝加尔针茅草原包括建群种和优势种在内的6种植物的比叶面积、叶绿素含量和养分含量等叶片性状对养分添加的响应,旨在探讨草原生态系统中,不同物种叶片特性随养分供给条件发生的变异及其与土壤理化特性之间的关系。结果表明,6种植物的比叶面积(specific leaf area, SLA)、叶绿素含量、叶片养分在不同养分添加下都发生了变化,但变化的范围和方向都不尽相同。综合6种植物进行分析,SLA与叶绿素含量、叶片含N量呈极显著正相关(P<0.01),与叶片含P量呈显著正相关(P<0.05);叶绿素含量与叶片含N量、土壤铵态氮含量呈极显著正相关(P<0.01);叶片含N量与土壤pH呈显著正相关(P<0.05);叶片含P量与土壤P、土壤速效P含量和土壤pH值呈极显著正相关(P<0.01)。综合研究表明,贝加尔针茅草原植物叶片含N量较低,植物叶片性状受N素影响显著,但不同物种对N素添加的反应不同,土壤养分供给的差异是叶片结构特性和叶片养分组成发生变化的重要原因。

Abstract: Nutrient addition is an effective management measure for recovery of degraded grassland. Stipa baicalensis grassland is a type of meadow steppe that plays an important role in livestock husbandry in China. We conducted a field experiment to explore the mechanisms underlying variation in plant leaf traits in a mature typical steppe ecosystem in Inner Mongolia where nutrients have been added since 2010. The experiment had a randomized block design with six blocks of eight treatments: CK (control, no nutrient addition), N (N addition only, 100 kg/ha), P (P addition only, 100 kg/ha), K (K addition only, 100 kg/ha), NP (mixed N and P addition, 100 kg/ha each), NK (mixed N and K addition, 100 kg/ha each), PK (mixed P and K addition, 100 kg/ha each), and NPK (mixed N, P, and K addition, 100 kg/ha each). We selected six dominant and sub-dominant plant species for analyses: S. baicalensis, Leymus chinensis, Achnatherum sibiricum, Melissitus ruthenica, Serratulay amatsutanna, and Filifolium sibicum. Together, these species account for >90% of the total community aboveground biomass. We investigated variations in specific leaf area (SLA), leaf chlorophyll content, leaf N content, and leaf P content of the six plants under different nutrient treatments, to determine their responses to variations in soil physical and chemical properties. In all six plant species, the SLA, chlorophyll content, and leaf nutrient contents varied among different nutrient treatments, but the scope and direction of changes differed among plant species. A correlation analysis demonstrated that leaf SLA was positively correlated with leaf chlorophyll content and leaf N content (P<0.01), and with leaf P content (P<0.05). Leaf chlorophyll content was positively correlated with leaf N content and soil NH4+-N (P<0.01). Leaf N content was positively correlated with soil pH (P<0.01). Leaf P content was positively correlated with soil P, soil available P, and soil pH (P<0.01). Our results indicate that there is a very low leaf N content, and that plant growth is N-limited in the S. baicalensis grassland in Inner Mongolia, China. Different species had different responses to N addition. Differences in soil nutrients may be one important reason for the observed variations in leaf structure and leaf nutrient contents.

中图分类号:

yangdianlin@caas.cn

刘红梅, 李洁, 于丽, 皇甫超河, 杨殿林. 养分添加对贝加尔针茅草原6种植物叶片性状的影响[J]. 草业学报, 2017, 26(5): 81-91.

LIU Hong-Mei, LI Jie, YU Li, HUANGFU Chao-He, YANG Dian-Lin. Effects of nutrient addition on leaf traits of six plant species in a Stipa baicalensis grassland in Inner Mongolia, China[J]. Acta Prataculturae Sinica, 2017, 26(5): 81-91.

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