摘要
利用染色和计算机解译的方法来确定太湖地区3种主要水稻土(白土、黄泥土和乌栅土)的优势流路径和大孔隙的分布状况。将土壤染色后,所拍摄的剖面染色图片经过Photoshop 8.0和ArcGIS 8.0处理,将所染的蓝色由深到浅平均分成10个等级,以此分析土壤剖面中大、小孔隙的比例。分析结果表明:(1)3种土壤剖面的优势流深度相差不大,均在80 cm左右。但因为乌栅土的地下水位较高(最高可达70 cm),所以优势流对乌栅土的地下水影响最大。(2)土壤剖面中不同深处的染色百分比与该处土壤容重有显著的相关性,土壤容重越大,染色百分比就越小。(3)不同土壤剖面大孔隙的数量和孔隙体积相差很大。在白土和黄泥土的所有土壤层次上以及乌栅土的剖面上第三至第四层,蓝色最深的两个等级之和的百分比即是剖面上该层>1 mm的大孔隙含量。另外在乌栅土剖面上的第一至第二层>1 mm的大孔隙含量数值与经染色后产生蓝色最深的3个等级百分数之和相当。
The objective of this paper is to analyze the distribution of macrmpore and preferential flow in the three main paddy soils （Bai soil, Huangni soil and Wushan soil） in Tai-lake region by means of coloration and computer interpretation. The blue color on soil profile was divided into 10 grades by use of Photoshop 8 and AreGIS 8, which was used to analyze the ratio of quantity of all kinds of macropore. The blue coior was divided from dark to light according to the levels which arrange from 1 to 10. The results were as follows： （1）There was not obvious difference in depth which the coloration reagent had reached in the soil profiles, the depths were all about 80 cm. Wushan soil is influenced mostly by preferential flow; because its groundwater level is high （it can arrive at the depth of 70 cm）. （2） The percentage of colorated section was prominent correlation with soil bulk density, the ratio decreased with the increase of bulk density. （3）There was much difference in quantity and volume of macropore in the profiles of the three soils. In all layers of Bai soil and Huangni soil as well as the third and the forth layers of Wushan soil, the summation of percentage of level 1～2 blueness almost equaled to the content of macropore （〉1 mm）. In the first and the second layers of Wushan soil, the summation of percentage of level 1～3 bluenessalmost equaled to the content of macropore（〉l ram）.
出处
《水土保持学报》
CSCD
北大核心
2006年第3期145-149,共5页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目(40371055)
高等学校博士学科点专项科研基金(20030307018)资助
关键词
太湖地区
染色法
计算机解译
大孔隙
Tai lake region
coloration
computer interpretation
macropore
