中文摘要：

为了探讨不同栽培年限日光温室土壤团聚体各组分有机碳含量变化,以辽宁省朝阳市日光温室土壤为研究对象,并以棚外旱田土壤为对照,研究了1、5、10、15及25年日光温室土壤不同粒径团聚体内轻组有机碳（Light fraction organic carbon,LFOC）和重组有机碳（Heavy fraction organic carbon,HFOC）含量的变化.结果表明,与旱田土壤相比,日光温室有利于土壤各组分有机碳的积累,且随着栽培年限的延长而增加,土壤有机碳（Soil organic carbon,SOC）与土壤LFOC含量呈显著正相关关系,相关系数R值高达0.994 5,而土壤HFOC增长缓慢;不同粒径土壤SOC、LFOC和HFOC含量均随着耕作年限的延长而有所增加.对于同一耕作年限不同粒径团聚体土壤的LFOC和HFOC含量变化按从大到小的顺序均表现为250～2 000 μm、53 ～ 250 μm、＜53 μm,且日光温室各粒径土壤LFOC和HFOC含量平均高于旱田土壤2.3倍和1.5倍.250～2 000 μm对日光温室土壤各组分有机碳库贡献最大,R值分别为0.993、0.991及0.967.

英文摘要：

This study aimed at exploring the content change of different fractions organic carbon in soil aggregates of solar greenhouse at different plant years. In order to analyze the content change of light fraction organic carbon （LFOC） and heavy fraction organic carbon （HFOC） in different soil aggregates, we took paired soil samples from five greenhouses （ 1 year, 5 years, 10 years, 15 years and 25 years） and adjacent highland were also taken as control study. Compared to ad- jacent highland, solar greenhouse was helpful for the accumulation of different components of SOC. The content of SOC was increased with the planted years and has significant positive correlation with LFOC, R value as high as 0. 994 5. However, the HFOC increased slowly. The content of SOC, LFOC and HFOC in different soil aggregates was increased with the culti- vating time. The content of LFOC and HFOC from large to small were showed that 250 - 2 000 m, 53 - 250 μm, 〈 53μm in different soil aggregates in the same plant years. The average content of LFOC and HFOC in different aggregates were 2. 3 times and 1.5 times higher than highland. The different components of soil organic carbon pool were mainly influence by 250 -2 000 μm soil aggregates, the value of R respectively were 0. 993, 0. 991 and 0. 967.