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中国沙漠  2013 

科尔沁沙质草地优势多年生植物氮素回收效率的分异特征

DOI: 10.7522/j.issn.1000-694X.2013.00099

Keywords: 氮素回收效率,荒漠草地,分类群,沙漠化

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Abstract:

养分回收是多年生植物重要的适应策略,通过这种方式可以使植物重新利用体内养分。尤其在养分贫瘠的环境中,养分条件的微小变化都会影响植物的生长、竞争和适合度。但是,不同物种和不同生活型植物的氮素回收效率具有较高的变异,这对理解不同物种或生活型植物在生态系统功能中的作用具有重要意义。本研究分析了科尔沁沙质草地生态系统中39种多年生植物成熟绿叶和枯叶的氮素含量和氮素回收效率,以揭示不同物种或生活型植物氮素回收效率的分异特征。结果表明:科尔沁沙质草地优势多年生植物成熟绿叶氮素含量的变化范围在12.2~33.4mg·g-1,平均值为23.3mg·g-1;与全国及全球尺度上的研究结果相比,科尔沁沙质草地成熟绿叶氮含量平均值偏高,说明干旱荒漠环境植物叶片平均氮含量相对较高;多年生植物枯叶的氮素含量明显小于成熟绿叶氮素含量,变化范围在6.2~18.8mg·g-1,平均值为11.3mg·g-1;多年生植物氮素回收效率的范围在29%至74%之间变化,平均值为50.3%。这说明氮素回收是科尔沁沙质草地生态系统多年生植物重要的养分保留策略之一。另外,沙质草地不同生活型植物的氮素回收效率存在显著的差异。固氮植物和禾本科植物的氮素回收效率显著低于灌木和杂类草植物。这一结果间接说明植物氮素保持能力的分异是半干旱沙质草地植物共存的机理之一。

References

[1]  Koerselman W,Meuleman A F M.The vegetation N∶P ratio:a new tool to detect the nature of nutrient limitation[J].Journal of Applied Ecology,1996:1441-1450.
[2]  Verhoeven J,Koerselman W,Meuleman A.Nitrogen-or phosphorus-limited growth in herbaceous,wet vegetation:relations with atmospheric inputs and management regimes[J].Trends in Ecology & Evolution,1996,11(12):494-497.
[3]  Aerts R,Chapin F S.The mineral nutrition of wild plants revisited:a re-evaluation of processes and patterns[M]/Fitter A H R D.Advances in Ecological Research,Vol 30.London,UK:Academic Press Inc,2000:30,1-67.
[4]  Marschner H.Mineral Nutrition of Higher Plants[M].London:Academic Press,1995:889.
[5]  Guha M M,Mitchell R L.The trace and major element composition of the leaves of some deciduous trees[J].Plant and Soil,1965,23(3):323.
[6]  Aerts R.Nutrient resorption from senescing leaves of perennials:Are there general patterns?[J].Journal of Ecology,1996,84(4):597-608.
[7]  Eckstein R L,Karlsson P S,Weih M.Leaf life span and nutrient resorption as determinants of plant nutrient conservation in temperate-arctic regions[J].New Phytologist,1999,143(1):177-189.
[8]  Killingbeck K T,Whitford W G.Nutrient resorption in shrubs growing by design,and by default in Chihuahuan Desert arroyos[J].Oecologia,2001,128(3):351-359.
[9]  Distel R A,Moretto A S,Didone N G.Nutrient resorption from senescing leaves in two Stipa species native to central Argentina[J].Austral Ecology,2003,28(2):210-215.
[10]  Killingbeck K T.Nutrients in senesced leaves:keys to the search for potential resorption and resorption proficiency[J].Ecology,1996,77(6):1716-1727.
[11]  Skujins J.Nitrogen Cycling in Arid Ecosystems[R].Stockholm,1981:477-491.
[12]  Su Y Z,Li Y L,Cui H Y,et al.Influences of continuous grazing and livestock exclusion on soil properties in a degraded sandy grassland,Inner Mongolia,northern China[J].Catena,2005,59(3):267-278.
[13]  Drenovsky R E,Richards J H.Critical N∶P values:predicting nutrient deficiencies in desert shrublands[J].Plant and Soil,2004,259(1/2):59-69.
[14]  Chapin F S.The mineral-nutrition of wild plants[J].Annual Review of Ecology and Systematics,1980,11:233-260.
[15]  Quested H M,Cornelissen J H C,Press M C,et al.Decomposition of sub-arctic plants with differing nitrogen economies:a functional role for hemiparasites[J].Ecology,2003,84(12):3209-3221.
[16]  Taylor B R,Parsons W F J,Parkinson D.Decomposition of populus-tremuloides leaf litter accelerated by addition of alnus-crispa litter[J].Canadian Journal of Forest Research,1989,19(5):674-679.
[17]  Berg B,Johansson M B,Meentemeyer V.Litter decomposition in a transect of Norway spruce forests:substrate quality and climate control[J].Canadian Journal of Forest Research,2000,30(7):1136-1147.
[18]  Moretto A S,Distel R A.Decomposition of and nutrient dynamics in leaf litter and roots of Poa ligularis and Stipa gyneriodes[J].Journal of Arid Environments,2003,55(3):503-514.
[19]  Berendse F.Effects of dominant plant species on soils during succession in nutrient-poor ecosystems[J].Biogeochemistry,1998,42(1/2):73-88.
[20]  Aerts R,Verhoeven J T A,Whigham D F.Plant-mediated controls on nutrient cycling in temperate fens and bogs[J].Ecology,1999,80(7):2170-2181.
[21]  Sankaran M,Ratnam J,Hanan N P.Tree-grass coexistence in savannas revisited-insights from an examination of assumptions and mechanisms invoked in existing models[J].Ecology Letters,2004,7(6):480-490.
[22]  Leffler A J,Peek M S,Ryel R J,et al.Hydraulic redistribution through the root systems of senesced plants[J].Ecology,2005,86(3):633-642.
[23]  Zou C B,Barnes P W,Archer S,et al.Soil moisture redistribution as a mechanism of facilitation in Savanna tree-shrub clusters[J].Oecologia,2005,145(1):32-40.
[24]  Mcculley R L,Jobbagy E G,Pockman W T,et al.Nutrient uptake as a contributing explanation for deep rooting in arid and semi-arid ecosystems[J].Oecologia.2004,141(4):620-628.
[25]  Bertiller M B,Sain C L,Carrera A L,et al.Patterns of nitrogen and phosphorus conservation in dominant perennial grasses and shrubs across an aridity gradient in Patagonia,Argentina[J].Journal of Arid Environments,2005,62(2):209-223.
[26]  Chapin F S,Kedrowski R A.Seasonal-changes in nitrogen and phosphorus fractions and autumn retranslocation in evergreen and deciduous taiga trees[J].Ecology,1983,64(2):376-391.
[27]  Birk E M,Vitousek P M.Nitrogen availability and nitrogen use efficiency in loblolly-pine stands[J].Ecology,1986,67(1):69-79.
[28]  Escudero A,Delarco J M,Garrido M V.The efficiency of nitrogen retranslocation from leaf biomass in quercus-ilex ecosystems[J].Vegetatio,1992,99/100:225-237.
[29]  Vitousek P M,Howarth R W.Nitrogen limitation on land and in the sea: how can it occur?[J].Biogeochemistry,1991,13(2):87-115.
[30]  Yuan Z Y,Li L H,Han X G,et al.Nitrogen resorption from senescing leaves in 28 plant species in a semi-arid region of northern China[J].Journal of Arid Environments,2005,63(1):191-202.
[31]  Ratnam J,Sankaran M,Hanan N P,et al.Nutrient resorption patterns of plant functional groups in a tropical savanna:variation and functional significance[J].Oecologia,2008,157(1):141-151.
[32]  Eckstein R L,Karlsson P S,Weih M.The significance of resorption of leaf resources for shoot growth in evergreen and deciduous woody plants from a subarctic environment[J].Oikos,1998,81(3):567-575.
[33]  Norby R J,Cotrufo M F,Ineson P,et al.Elevated CO2,litter chemistry,and decomposition:a synthesis[J].Oecologia,2001,127(2):153-165.
[34]  Knops J M H,Bradley K L,Wedin D A.Mechanisms of plant species impacts on ecosystem nitrogen cycling[J].Ecology Letters,2002,5(3):454-466.
[35]  Luo Y,Zhao X,Zuo X,et al.Leaf nitrogen resorption pattern along habitats of semi-arid sandy land with different nitrogen status[J].Polish Journal of Ecology,2010,58(4):707-716.
[36]  王涛,赵哈林.中国沙漠化研究的进展[J].中国沙漠,1999,19(4):299-311.
[37]  彭飞,王涛,薛娴.基于RUE的人类活动对沙漠化地区植被影响研究——以科尔沁地区为例[J].中国沙漠,2010,30(4):896-902. 浏览
[38]  葛晓东,明鑫,叶青,等.科尔沁沙地近水区域土地利用及沙漠化时空过程研究——以奈曼旗为例[J].中国沙漠,2010,30(5):1012-1018. 浏览
[39]  苏永中,赵哈林.农田沙漠化过程中土壤有机碳和氮的衰减及其机理研究[J].中国农业科学,2003,36(8):928-934.
[40]  苏永中,赵哈林,崔建垣.农田沙漠化演变中土壤性状特征及其空间变异性分析[J].土壤学报,2004,41(2):210-217.
[41]  李玉强,赵哈林,李玉霖,等.科尔沁沙地不同生境土壤氮矿化/硝化作用研究[J].中国沙漠,2009,29(3):438-444. 浏览
[42]  Li F R,Zhao L Y,Zhang H,et al.Wind erosion and airborne dust deposition in farmland during spring in the Horqin Sandy Land of eastern Inner Mongolia,China[J].Soil & Tillage Research,2004,75(2):121-130.
[43]  Zhang T H,Zhao H L,Li S G,et al.Grassland changes under grazing stress in Horqin sandy grassland in Inner Mongolia,China[J].New Zealand Journal of Agricultural Research,2004,47(3):307-312.
[44]  赵红洋,李玉霖,王新源,等.科尔沁沙地52种植物叶片性状变异特征研究[J].中国沙漠,2010,30(6):1292-1298. 浏览

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