干旱区生态环境知识资源中心(Arid): 南方丘陵区土壤氮素尺度效应的影响因素

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	南方丘陵区土壤氮素尺度效应的影响因素
其他题名	Analysis on influence factors for scale effect of soil nitrogen in hilly region
	张世熔 1; 孙波 1; 赵其国 1; 李婷 2; 陈红琳 2; 黄丽琴 2
ISSN	1000-0933
出版年	2007
卷号	27 期号:10 页码:4057-4064
中文摘要	利用GPS、GIS和随机过程抽样技术,研究了江西省兴国县潋水河流域土壤氮素在小、中和大3种研究尺度下的分布特征及其影响因素.结果表明,土壤全氮和有效氮尺度效应明显,均值随研究尺度的扩大而增加.其中,土壤全氮平均含量分别是0.60 g kg~(-1)、0.73 g kg~(-1)和0.83 g kg~(-1),有效氮含量为 64.8 mg kg~(-1)、66.3 mg kg~(-1)和80.2 mg kg~(-1).成土母质、土壤类型、土地利用和土壤侵蚀状况是影响氮素尺度效应的重要因素.3种尺度下母质与土壤氮素含量关系复杂,但均以花岗岩坡残积物发育土壤最低.在不同尺度下,水稻土全氮和有效氮均显著或极显著高于红壤,但大尺度下的石灰岩土与前二种土壤差异均不显著.在小尺度和中尺度下水田全氮显著或极显著高于旱地和林地,在大尺度下它显著高于旱地而与林地差异不显著;水田有效氮显著或极显著高于林地,但与旱地除小尺度下差异达显著水平外,中、大尺度下差异不显著.土壤侵蚀状况对土壤全氮和有效氮含量的影响与尺度大小有关,且随尺度增加差异显著性逐渐增强.
英文摘要	Nitrogen is an essential nutrient element for the plant. Its transformation affects the quality of a regional environment and the eco-process for it is the main matter of greenhouse gas and water pollutants. It is well known that soil nitrogen shows obviously spatial variation with the heterogeneity of landform, parent material, landuse and fertilization, but its scale effect began to be known in the recent years. We adopted the microscale(slope scale), mesoscale (small valley scale) and macroscale (valley scale) to study the spatial distribution characteristic for soil total nitrogen and available nitrogen on the SPSS12.0 software platforms in Lianshui Basin, Xingguo County, Jinagxi Province, China. Lianshui Basin(the macroscale region) lies between 115°30′50E to 115°52′12E longitude and 26°18′04N to 26°36′48N latitude with the area of 579km~2. The tectonics from east to west are Zitong Anticline, Meijiao Syncline, Jiuloudong Anticline,Gulonggang Syncline, Yelongjian Anticline and Xinglian Syncline. Topography in the northeast is higher than that in the southwest. Flat ground, low-hill, mid-hill and high-hill occupy 10%, 21%, 27% and 42% of the basin area, respectively. The climate of the region is mid-subtropical. Monthly mean atmosphere temperature ranges from 7.2 ℃ to 29.3 ℃. Annual rainfall is 1500mm and concentrates on April to June. The remaining secondary forest is conifer after original every broadleaf forest was destroyed. Parent materials are composed of alluvium, and residual and slope deposit of granite, limestone and phyllite. Soil types are red soil, paddy soil and limestone soil. The mesoscale district is the typical agro-forest zone with 2635.84 hm~2 in the valley, and the area of the microscale transect is 3.88 hm~2 in the zone.According to environmental and social economy difference, sample points were devised by grid and hierarchical approaches. Among them, 46 samples for the microscale plot, 52 ones for the mesoscale district and 74 ones for the macroscale region were located by GPS (Global Position System). The topsoil samples in the 0-30cm were tested in the laboratory. Soil total nitrogen (STN) was determined by semi-micro Kjeldahl method and soil available nitrogen (SAN) was tested by NaOH hydrolysable method.The results showed that the mean contents of STN and SAN increased with scales or research areas spread. Parent material, soil type, landuse and soil erosion were the main influence factors for the nitrogen contents in the multiscales. The relationship of the STN and the SAN with parent materials was very complex in the multiscales, but the nitrogen contents were the lowest in the soil from the slope-residual deposit of granite. On the three scales, STN and SAN in paddy soil were remarkably or very remarkably higher than that in red soil. However the difference of the nitrogen contents in limestone soil was not obvious with paddy soil and red soil in the macroscale. In the micro-and meso-scales, STN of paddy field was significantly or very significantly higher than those of arid and forest land, but it was only remarkably higher than the content of arid land and not obviously different from that of forest land in the macroscale. SAN of the paddy field was significantly or very significantly higher than those of the forest land in the multiscales and arid land in microscale, however the difference from the contents of arid land was not obvious in meso-and macro-scales. The influence of soil erosion intensities on STN and SAN was close to the research scale, and increased with the scale-up.
中文关键词	全氮 ; 有效氮 ; 尺度效应 ; 丘陵区
英文关键词	total nitrogen available nitrogen scale effect hilly region
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:2937133
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/221354
作者单位	1.中国科学院南京土壤研究所, 南京, 江苏 210008, 中国; 2.四川农业大学资源环境学院, 雅安, 四川 625014, 中国
推荐引用方式 GB/T 7714	张世熔,孙波,赵其国,等. 南方丘陵区土壤氮素尺度效应的影响因素[J],2007,27(10):4057-4064.
APA	张世熔,孙波,赵其国,李婷,陈红琳,&黄丽琴.(2007).南方丘陵区土壤氮素尺度效应的影响因素.,27(10),4057-4064.
MLA	张世熔,et al."南方丘陵区土壤氮素尺度效应的影响因素".27.10(2007):4057-4064.