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合理施入有机物料是保持和改善土壤有机质状况,培肥土壤的重要措施。1964年蔡道基曾用砂滤管测定稻草的分解速率。近年来,林心雄等人采用砂滤管法,在南方水田研究了非标记植物残体的分解速率,得到了较为满意的结果。在半干旱地区的土壤上尚缺乏这方面的研究资料。为此,笔者于1982年春采用砂滤管法观察了玉米秸、麦秸和新鲜猪粪在不同气候特点、土壤类型条件下的分解速率和残留数量,并初步揭示在半干旱地区不同水热条件下有机物料还田的分解规律和腐殖化系数,为确定在不同地区条件下有机物料的还田数量和适宜还田措施,提供了科学数据.一、试验方法试验用砂滤管为碳化硅管,内径38毫米,高155毫米,管壁厚8.5毫米,能透水透气,但不会透入植物根系.
Rational application of organic materials is to maintain and improve the status of soil organic matter, soil fertility training an important measure. In 1964, Cai Daoji used sand filter tube to measure the decomposition rate of straw. In recent years, Lin Xinxiong and others using sand filter tube method in the southern paddy field studied the decomposition rate of non-labeled plant residues obtained more satisfactory results. In the semi-arid area of soil is still lack of research data in this area. Therefore, in the spring of 1982, the authors used sand filter tube method to observe the decomposition rate and residual amount of corn stalks, wheat straw and fresh pig manure under different climatic characteristics and soil types, and initially revealed that under different hydrothermal conditions in semi-arid area Organic Matter Returning to the law of decomposition and humification coefficient, in order to determine the amount of organic materials in different regions and the number of appropriate measures to return to provide scientific data First, the test method Test sand filter for silicon carbide tube , 38 mm in inner diameter, 155 mm in height and 8.5 mm in wall thickness, permeable to water and breathable without penetration into plant roots.