沈阳市郊日光温室土壤有机碳组成特征研究

Organic Carbon Compositions of Soil in Vegetable Sunlight Greenhouse

对沈阳市郊东陵、于洪、苏家屯、新城子四区蔬菜栽培15年左右的日光温室土壤有机碳组成特征进行了研究,以相应温室外的露地栽培土壤为对照,结果表明:日光温室蔬菜栽培的有机肥用量远远高于温室外露地栽培。随着有机肥用量增加,温室土壤水溶性碳、腐殖酸碳的增加比例小于胡敏素碳的增加比例。各区温室土壤总有机碳、非腐殖质碳、腐殖质碳数量的平均值分别是温室外露地的1.76～3.06倍、3.41～5.23倍、1.57～2.99倍。温室土壤中非腐殖质所占比例较对照露地的大,其水浮物碳占总有机碳比例是对照露地的1.80～2.63倍,温室和露地土壤水溶性物质碳占总有机碳的百分比大多低于2%。温室土壤胡敏酸碳、富里酸碳、胡敏素碳数量均高于对照露地,但有1/3以上的温室土壤H/F低于对照露地土壤。由于不同农户的水、肥管理水平差异较大,不同温室土壤的总有机碳及各组分的碳变异性较大。

Organic carbon compositions were studied in sunlight greenhouse soils in Shenyang. The results showed that the amount of organic manure application in sunlight greenhouse was much more than that in the field soils. Water soluble carbon, humic acid carbon were improved more than humin carbon, with the organic manure application increasing. Total organic carbon, nonhumus, humus in greenhouse soils was 1.76-3.06 times, 3.41-5.23 times, 1.57-2.99 times of that in field soils. The percentage content of nonhumus in greenhouse was more than that in field soils, Water floating substance carbon in greenhouse was 1.80-2.63 times of that in fields, water soluble carbon account for TOC was less than 2% in both greenhouse soils and field soils. The carbon contents of humic acid, fulvic acid, humin were more than that in control, however, H/F was lower in more than thirty percent of greenhouse. Because of different water and fertilizer management, the contents and variability of soil organic carbon compositions in greenhouse were high.