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土壤有机质和全量氮磷钾素含量状况等是土壤肥力重要的物质基础。在紫色丘陵区3km2典型样区内,按5个hm-2取样,分析和探讨不同土地利用方式下(旱地、水田、撂荒地和人工林)土壤有机质和全量氮磷钾含量状况,为农业可持续发展、生态环境建设和紫色土区土地利用结构调整提供理论依据。结果表明,旱地土壤有机质含量和土壤C/N值在四种利用方式下最低,分别为4.49±0.38gkg-1和5.58±0.31gkg-1,林地土壤全磷含量和全钾含量最低,分别为0.74±0.07gkg-1和13.77±1.37gkg-1,撂荒地土壤全氮含量最低,为0.79±0.07gkg-1,而水田的各项指标则处于中上水平;四种土地利用方式下土壤有机质和全量氮磷钾含量与全国平均含量水平相比较高;有机质含量与全氮含量呈线性关系,且均达极显著水平(P<0.01)。
Soil organic matter and total nitrogen, phosphorus and potassium status and other soil fertility is an important material basis. In the typical hilly area of 3km2, five hm-2 samples were taken to analyze and discuss the contents of soil organic matter and total nitrogen, phosphorus and potassium in different land use types (dry land, paddy field, fallow land and plantation) Sustainable development, ecological environment construction and land use structure adjustment in purple soil area to provide a theoretical basis. The results showed that the content of soil organic matter and the soil C / N in dryland soil were the lowest under the four kinds of utilization patterns, which were 4.49 ± 0.38gkg-1 and 5.58 ± 0.31gkg-1, respectively. The total phosphorus content and total potassium content in forest soil were the lowest 0.74 ± 0.07gkg-1 and 13.77 ± 1.37gkg-1, respectively. The content of total nitrogen in wasteland was the lowest, which was 0.79 ± 0.07gkg-1, while the index of paddy field was in the upper-middle level. Soil organic matter And the content of total N, P and K was higher than the national average level. The content of organic matter was in a linear relationship with the total nitrogen content, and reached the extremely significant level (P <0.01).