| 生物土壤与生态 |
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| Response of Vegetation Herb Layer to Nitrogen Fertilizer in Steppe Desert |
| SU Jie-qiong1,2, LI Xin-rong1, LI Xiao-jun1, HE Hao-yu1,2, JIA Rong-liang1, GAO Yong-ping1 |
| 1.Shapotou Desert Experimental Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Water content is the first abiotic limiting factor of the ecological process in desert region, while soil nitrogen is usually considered as the secondary limiting factor because of its direct influence on vegetation productivity and soil ecological process. The response of plant abundance, species richness, species height and aboveground biomass of desert herbaceous vegetation to nitrogen fertilizer amended artificially was investigated in the paper. The result indicated that both plant abundance and species richness decreased in the year of nitrogen fertilizer treatment and the second year under 12.5, 25, 50 g·m-2 fertilization levels compared to no nitrogen fertilizer amended treatment. The higher the gradient of fertilizer levels, the more obvious plant abundance and species richness decreased, which supported the conclusion derived from the response of characteristic grassland and forest vegetation to nitrogen increase or nitrogen deposition that biodiversity would reduce with the increase of nitrogen. However, aboveground biomass showed the opposite response to nitrogen fertilizer in the first year (annual precipitation was 1.4 times over the average) and the second year (annual precipitation was 0.7 times over the average), and aboveground biomass increased with the gradient of fertilizer levels in the first year and decreased in the second year significantly, which showed that coupling of water and fertilizer similarly is beneficial to the improvement of desert ecosystem productivity. Vegetation height showed no significant difference under the gradient of nitrogen fertilizer levels (P>0.05), which possibly was determined by the inherent biological characteristics of desert herbaceous vegetation.
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Received: 02 November 2009
Published: 20 November 2010
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[1]Vitousek P M,Howarth R W.Nitrogen limitation on land and in the sea:How can it occur?[J].Biogeochemistry,1991,13:87-115.
[2]Austin A T,Yahdjian L,Stark J M,et al.Water pulses and biochemical cycle in arid and semiarid ecosystems[J].Oecologia,2004,141:221-245.
[3]Kaupa S V.Effects of atmospheric ammonia(NH3) on terrestrial vegetation:A review [J].Environmental Pollution,2002,124:179-221.
[4]Zavaleta E S,Shaw M R,Chiariello N R,et al.Additive effects of simulated climate change,elevated CO2,and nitrogen deposition on grassland diversity[J].Processing of the National Academy of Science,USA,2003,100:7650-7654.
[5]Schwinning S,Sala O E.Hierarch of responses to resource pulses in arid and semi-arid ecosystems[J].Oecologia,2004,141:211-220.
[6]Stevens C J,Dise N B,Mountford J O,et al.Impact of nitrogen deposition the species richness of grasslands[J].Science,2004,303:1876-1879.
[7]Michal H,Michaela K,Jürgen S.The rengen grassland experiment:Plant species composition after 64 years of fertilizer application[J].Agriculture,Ecosystems and Environment,2007,122:259-266.
[8]陈亚明,李自珍,杜国祯.施肥对高寒草甸植物多样性和经济类群的影响[J].西北植物学报,2004,24(3):424-429.
[9]邱波,罗燕江,杜国祯.施肥梯度对甘南高寒草甸植被特征的影响[J].草业学报,2004,13(6):65-68.
[10]郑华平,陈子萱,王生荣,等.施肥对玛曲高寒沙化草地植物多样性和生产力的影响[J].草业学报,2007,16(5):34-39.
[11]马涛,武高林,何彦龙,等.青藏高原东部高寒群落生物量和补偿能力对施肥和刈割的响应[J].生态学报,2007,27(6):2288-2293.
[12]纪亚君.青海高寒草地施肥的研究概况[J].草业科学,2002,19(5):14-18.
[13]寇明科,王安碌,张生璨,等.不同施肥处理对提高高寒人工混播草地产草量的试验研究[J].草业科学,2003,20(4):14-15.
[14]Guanghui X,Yosef S.Temporal patterns of C and N under shrub canopy in a loessial soil desert ecosystem [J].Soil Biology & Biochemistry,2001,33:1371-1379.
[15]李新荣.干旱沙区土壤空间异质性变化对植被恢复的影响[J].中国科学(D辑),2005,35(4):361-370.
[16]李守中,肖洪浪,宋耀选,等.腾格里沙漠人工固沙植被区生物土壤结皮对降水的拦截作用[J].中国沙漠,2002,22(6):612-615.
[17]李守中,肖洪浪,罗芳,等.沙坡头植被固沙区生物结皮对土壤水文过程的调控作用[J].中国沙漠,2005,25(2):228-233.
[18]刘立超,李守中,宋耀选,等.沙坡头人工植被区微生物结皮对地表蒸发影响的试验研究[J].中国沙漠,2005,25(2):191-195.
[19]李新荣,马凤云,龙利群,等.沙坡头地区固沙植被土壤水分动态研究[J].中国沙漠,2001,21(3):217-222.
[20]齐凤林,袁勇军,曹建国,等.沙地低产草地施肥试验研究[J].中国草地,1998(1):24-28.
[21]周青平,金继运,德科加,等.不同施氮水平对高寒草地牧草增产效益的研究[J].土壤肥料,2005,(3):92-94.
[22]王新平,张景光,李新荣,等.沙坡头地区多年降水分布特征趋势及其变率[J].中国沙漠,2001,21(3):260-261.
[23]王新平,张志山,张景光,等.荒漠植被影响土壤水文过程研究评述[J].中国沙漠,2005,25(2):196-201.
[24]戎郁萍,韩建国,王培,等.施氮与株丛切割对退化新麦草草地的改良效果[J].草地学报,1999,7(2):157-164.
[25]曾光华.国外草地施肥及灌溉方面的研究概况[J].青海畜牧兽医杂志,1994,24(3):31-32. |
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2010, Vol. 30 
