小区域水平土壤有机质动态变化的评价与分析

采用动态比较的方法，分析评价了中国科学院千烟洲试验站站区范围内开垦利用后土壤有机质含量的总体变化情况及不同利用方式下变异特点。结果表明，具有我国南方低丘红壤区典型特点的千烟洲试验站在人为利用后，站区土壤有机质含量总体呈上升趋势，１１年间土壤有机质平均含量由原来１４．７８ｇ／ｋｇ上升到目前的１５．１３ｇ／ｋｇ。不同土壤之间，原土有机质含量较低的砂红壤、水稳土、潮土有机质含量分别增加了１．４１ｇ／ｋｂ

Analysis and Evaluation of Soil Organic Matter Dynamics at a Little Region Scale

General changes of soil organic matter content and its variations under different utilizing patterns after reclamation were analyzed and evaluated by the dynamic and comperative methods at the Qianyanzhou Experimental Station of Chinese Academy of Sciences. The results show that the soil organic matter content of Qianyanzhou Experimental Station which has a typical characteristic of low hilly red soil of the southern China was generally a tendency towards increase with a mean change from 14. 78 g/kg to 15. 13 g/kg after 11-year's reclamation. The organic matter content of sandy red soil, paddy soil, and chao soil, which were a low native organic matter content, increased by 1. 41 g/kg, 2. 44 g/kg and 2. 50 g/kg, respectively; yet those of silty red soil and umbrihumus chao soil, which were a high native organic matter content, decreased by 1. 78 g/kg and 3. 98 g/kg, respectively. The changes of soil organic matter content were also different from the utilizing patterns with an increase of paddy field, vegetable land and grassland by 2. 04 g/kg, 4. 01 g/kg, 7. 32 g/kg, and a decrease of upland, Chinese fir land and uncropped land by 4. 93 g/kg, 2. 98 g/kg, 3. 68 g/kg, respectively. The soils of different slope positions, with a different soil type and utilizing characteristics, have a different organic matter storages by the most of artificial forest land on the top, middle of paddy fields on the lower and gentle slopes and vally plains, lowest of upland and orchard soils on the hill sides.