土地利用变化对沙地土壤全氮空间分布格局的影响

摘要/Abstract

摘要： 利用经典统计学和地统计学相结合的方法,分析了科尔沁沙地东南缘草地和8年前开垦的耕地土壤全氮含量和空间分布格局.结果表明,草地与耕地表层(0～10 cm)土壤全氮含量差异不显著,亚表层(10～20 cm)含量差异显著(P<0.05);耕地土壤全氮贮量比草地高262.36 kg·hm^-2.草地与耕地比较,表层和亚表层土壤全氮的空间分布格局均有明显差异,草地土壤全氮的基台值、空间相关度比耕地小,而其变程和分数维比耕地大;草地土壤全氮水平空间异质性低,水平空间分布格局比较均匀,而耕地土壤全氮水平空间异质性高,水平空间分布格局明显.草地表层与亚表层土壤全氮含量差异显著(P<0.05),空间结构特征和空间分布格局差异明显,但空间分布格局有较强的相关性(r=0.395,P<0.05);耕地表层与亚表层土壤全氮含量差异不显著(P<0.05),但空间结构特征有一定的差异,而空间分布格局相类似,空间相关性极高(r=0.683,P<0.01).可见,农业活动不仅影响土壤中全氮的含量,还影响着其空间结构特征及其水平和垂直空间分布格局.这对深入理解土地利用变化对生态系统氮素格局及其循环的影响具有重要意义.

关键词: 农业活动, 土壤全氮, 地统计学, 科尔沁沙地, 空间格局

Abstract: By using statistics and geostatistics,this paper studied the content and spatial pattern of soil total nitrogen (TN) in a glassland and an arable land of southeast Keerqin sandy land.The TN content in 0～10 cm soil layer of the arable land reclaimed from a glassland 8 years ago was not different from that of the virgin grassland,but the TN content in 10～20 cm soil layer was higher than that in the grassland (P <0.05).The soil TN storage in the grassland was 262.36 g·hm^-2 higher than that in the arable land,and its spatial pattern was significantly different between arable land and grassland.The heterogeneity and spatial dependence of TN in each soil layer (0～10 cm and 10～20 cm) of the arable land were larger than those of the grassland,and the ranges and fractal dimensions of TN in each soil layer of the arable land were larger than those of the grassland.There existed a clear horizontal spatial structure heterogeneity and spatial distribution pattern in the arable land,while in the grassland,the horizontal spatial structure heterogeneity was very low,and the horizontal spatial distribution pattern was random and uniform.The TN content in the 0～10 cm and 10～20 cm soil layers of the arable land had no difference (P <0.05),its spatial structure characters had some difference (P <0.05),and its spatial distribution pattern was very similar (r=0.683,P <0.05).The TN content and its spatial structure characters between two soil layers of the grassland had remarkable difference (P <0.05),but its spatial distribution pattern in the two layers was relatively similar (r=0.395,P <0.05).In conclusion,agricultural activity could not only influence soil TN content,but also influence its spatial structure characteristics and spatial distribution pattern.Therefore,our study might promote the further study on the effect of land use change on soil nitrogen distribution pattern and its cycling in ecosystems.

Key words: Agricultural activity, Soil total nitrogen, Geostatastics, Keerqin sandy land, Spatial pattern

中图分类号:

X171.4

陈伏生, 曾德慧, 陈广生. 土地利用变化对沙地土壤全氮空间分布格局的影响[J]. 应用生态学报, 2004, (6): 953-957.

CHEN Fusheng, ZENG Dehui, CHEN Guangsheng. Effect of land use change on spatial distribution pattern of soil total nitrogen in Keerqin sandy land[J]. Chinese Journal of Applied Ecology, 2004, (6): 953-957.

参考文献

[1] Aguilar R,Kelly EF,Heil RD.1988.Effects of cultivation on soils in northern Great Plains rangeland.Soil Sci Soc Am J,52:1081～1085
[2] Bai Y-F(白永飞),Xu Z-X(许志信).2002.On the small scale spatial heterogeneity of soil moisture,carbon and nitrogen in Stipa communities of the Inner Mongolia Plateau.Acta Ecol Sin(生态学报),22(8):1215～1223(in Chinese)
[3] Chapin,FS,Torn MS,Tateno M.1996.Principles of ecosystem sustainability.Amer Nat,148:1016～1037
[4] Chen F-S(陈伏生),Zeng D-H(曾德慧),Chen G-S(陈广生),et al.2003.Comparative analysis on spatial patterns of soil moisture under different land use types in Keerqin sandy land.Chin J Ecol(生态学杂志),22(6):43～48(in Chinese)
[5] Chen G-S(陈广生),Zeng D-H(曾德慧),Chen F-S(陈伏生),et al.2003.A research review on "fertile islands" of soils under shrub canopy in arid and semi-arid regions.Chin J Appl Ecol(应用生态学报),14(12):2295～2300(in Chinese)
[6] Ettershank GJ,Ettershank MB,Whitford WG.1978.Effects of nitrogen fertilization on primary productivity in a Chihuahuan Desert ecosystems.J Arid Environ,1:135～139
[7] Evans RD,Ehleringer JR.1993.A break in the nitrogen cycle of aridlands:Evidence from 15N of soils.Oecologia,94:314～317
[8] Han X-G(韩兴国),Lin L-H(李凌浩),Huang J-F(黄建辉).1999.An Introduction to Biogeochemistry.Beijing:China Higher Education Press.197～244(in Chinese)
[9] Jackson RB,Caldwell MM.1993.The scale of nutrient heterogeneity around individual plants and its quantification with geostatistics.Ecology,74:612～614
[10] Jiang F-Q(姜凤岐),Cao C-Y(曹成有),Zeng D-H(曾德慧),et al.2002.Degradation and Restoration of Ecosystems on Keerqin Sandy Land.Beijing:China Forestry Press.(in Chinese)
[11] Keeney DR.1980.Prediction of soil nitrogen availability in forest ecosystems:A literature review.For Sci,26:159～171
[12] Li H-B(李哈滨),Wang Z-Q(王政权),Wang Q-C(王庆成).1998.Theory and methodology of spatial heterogeneity quantification.Chin J Appl Ecol(应用生态学报),9(6):651～657(in Chinese)
[13] Ludwig JA,Whitford WG,Cornelius JM.1989.Effects of water,nitrogen and sulfur amendments on cover,density and size of Chihuahuan desert ephemerals.J Arid Environ,16:35～42
[14] McConnell SG,Quinn ML.1988.Soil productivity of four land use systems in southeastern Montana.Soil Sci Soc Am J,52:500～506
[15] Mooney HA,Vitousek PV,Matson PA.1987.Exchange of materials between terrestrial ecosystems and the atmosphere.Science,238:926～932
[16] Peterjohn WT,Schlesinger WH.1990.Nitrogen loss from deserts in the southwestern United States.Biogeochemistry,10:67～79
[17] Reynolds JF,Virginia RA,Schlesinger WH.1997.Defining functional types for models of desertification.In:Smith TM,Shugart HH,Woodword FI,eds.Plant Function Types:Their Relevance to Ecosystem Properties and Global Change.Cambridge:Cambridge University Press.195～216
[18] Robertson GP.1987.Geostatistics in ecology:Interpolating with known variance.Ecology,68:744～748
[19] Schlesinger WH,Raikes JA,Hartley AE,et al.1996.On the spatial pattern of soil nutrients in desert ecosystems.Ecology,77:364～374
[20] Schlesinger WH,Reynolds JF,Cunningham GL,et al.1990.Biological feedbacks in global desertification.Science,247:1043～1048
[21] Schlesinger WH.1991.Biogeochemistry:An Analysis of Global Change.California:Academic Press.
[22] Tamm CO.1992.Nitrogen in Terrestrial Ecosystems:Questions of Productivity,Vegeational Changes,and Ecosystem Stability.Ecological Studies 81.Berlin:Springer-Verlag.
[23] Tilman D,Farglione J,Wolff B,et al.2001.Forecasting agriculturally-driven global environmental change.Science,292:281～284
[24] Vitousek PM,Aber JD,Howarth RW,et al.1997.Human alteration of the global nitrogen cycle:Causes and consequences.Ecol Appl,7:737～750
[25] Vitousek PM,Gosz JR,Grier CC,et al.1979.Nitrate losses from disturbed ecosystems.Science,204:469～474
[26] Vitousek PM,Howarth RW.1991.Nitrogen limitation on land and in the sea:How can it occur.Biogeochemistry,13:87～115
[27] Wang Z-Q(王政权).1999.Geostatistics and Application in Ecology.Beijing:Science Press.(in Chinese)
[28] Webster R.1985.Quantitative spatial analysis of soil in the field.Adv Soil Sci,3:1～70
[29] West NE,Klemendson JO.1978.Structural distribution of nitrogen in desert ecosystems.In:West NE,Skujins JJ,eds.Nitrogen in Desert Ecosystems.Hardcover:van Nostrand Reinhold.1～16
[30] Zheng Z-P(郑昭佩),Liu Z-X(刘作新).2003.Soil quality and its evaluation.Chin J Appl Ecol(应用生态学报),14(1):131～134(in Chinese)