摘要
根据60个土壤有机质含量的样点数据,在ArcGIS9.0平台上采用普通克里格插值法研究了石渠县丘状高原区土壤有机质的空间分布特征及其影响因素。结果表明,该区表层土壤有机质含量为(134.24±114.46)g/kg,远高于四川和全国土壤有机质的平均水平。土壤有机质的水平地理分布特征以红旗、格孟为高值中心(>200g/kg)分别向南、西和北3个方向呈环状或带状逐渐减少;在海拔<4000m、4000～4400m、4400～4800m和>4800m的不同海拔高度,土壤有机质含量分别为57.80g/kg、185.04g/kg、252.48g/kg和157.20g/kg;剖面发生层分布特征以土壤有机质随着土层加深而降低的表聚作用为主。不同成土母质形成的土壤有机质含量的高低是洪积物<残坡积物<新冲积物<坡积物<老冲积物,而植被、地形、坡度通过土壤的植被生物量、有机残体量、土壤侵蚀程度等影响土壤有机质区域分布特征。
The spatial variability of soil organic matter （SOM） in the Shiqu County was expressed by the spatial analytic approaches such as ordinary kriging （OK） on the basis of the software ArcGIS Desktop 9.0. The results show that the average content of SOM is （134.24 ± 114.46） g/kg, which is far higher than the average level in Sichuan and in the national. The regional distribution characteristics of SOM takes Hongqi and Gemeng as high value center （ 〉 200 g/kg）, and to the south, west and north three directions gradually takes on decreasing as ring-like or belt-shaped, low value belt （ 〈80 g/ kg） distributed in Jinsha river basin. SOM content in soils which is at different altitude, such as 〈 4000 m, 4000-4400 m, 4400-4800 m and 〉4800 m, is 57.80 g/kg, 185.04 g/kg, 252.48 g/kg and 157.20 g/kg, respectively. The SOM content decreases from surface soil layer to subsoil. Meanwhile, different parent materials, vegetation, topographty and slope lead to the different SOM content levels.
出处
《四川农业大学学报》
CSCD
2006年第4期417-421,共5页
Journal of Sichuan Agricultural University
基金
四川省教育厅基金(2005A005)
四川省青年科技基金(04ZQ026-018)和ZH14302
关键词
丘状高原
土壤有机质
区域分布特征
影响因素
Hilly Plateau
SOM
regional distribution characteristic
influencing factors
