草业学报2017，Vol.26Issue(8)：43-53,11.DOI:10.11686/cyxb2016383
氮、磷添加对贝加尔针茅草原凋落物分解的影响
Effects of nitrogen and phosphorus addition on litter decomposition on the Stipa baicalensis steppe
摘要
Abstract
Litter decomposition is one of the main pathways of nutrient cycling and energy flow in grassland ecosystems.Nutrient limitation is the major factor limiting production on the warm steppe.In this study,the effects of nutrient addition on litter decomposition were investigated to provide a theoretical reference for nutrient management,restoration,and construction of grassland ecosystems.On the Stipa baicalensis steppe in Inner Mongolia,the leaves,stems,and roots of S.baicalensis (Sb),Leymus chinensis (Lc) and Artemisia frigida (Af) were placed in mesh bags to measure decomposition in different treatments:CK (no fertilization),fertilization with N (ammonium nitrate),P (triple superphosphate),or NP (mixed ammonium nitrate and triple superphosphate).The residual rates of all three plants were significantly lower in the N,P,and NP treatments than in the CK,indicating that N and P addition promoted decomposition.During the decomposition process,N was released from leaves and roots at an early stage and enriched at later stages,whereas N in stems showed an enrichment-release-enrichment pattern.The leaves,stems,and roots released P and C continuously during decomposition.The residual rate of P decreased as the plant organs decomposed.The 95％ decomposition time of S.baicalensis,L.chinensis,and A.frigida was 3.32-3.77 years,2.95-3.96 years,and 2.64-4.89 years,respectively.The decomposition responses to fertilizers differed among plant organs and among plant species.关键词
贝加尔针茅草原/凋落物/氮、磷添加/分解速率Key words
Stipa baicalensis steppe/litter/N, P addition/decomposition rate引用本文复制引用
李文亚,邱璇,白龙,杨殿林..氮、磷添加对贝加尔针茅草原凋落物分解的影响[J].草业学报,2017,26(8):43-53,11.基金项目
国家自然科学基金(31170435)资助. （31170435）
