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采用离子交换膜埋植培养法,对陕西省永寿县马莲滩流域沙棘纯林、沙棘×刺槐、沙棘×侧柏、沙棘×油松四种类型林分不同深度土壤的氮矿化速率进行了研究。结果表明,用离子交换膜从土壤中提取出的氮量随着其培养时间的增加而增加,且与土壤全氮含量、碱解氮含量及土壤磷酸酶活性三个土壤肥力指标呈极显著相关,培养30 d所得氮矿化速率与这三个土壤肥力指标的相关系数达到了0.850、0.857和0.736,此方法可用来较准确测定土壤的氮矿化速率;经测定,四种类型沙棘人工林氮矿化速率大小顺序为:沙棘纯林>沙棘×油松>沙棘×刺槐>沙棘×侧柏。
The rate of nitrogen mineralization in four types of forests with different depths, such as pure seabuckthorn, seabuckthorn × acacia, seabuckthorn × arborvitae, seabuckthorn × pine in the Maliantan watershed in Yongshou County, Shaanxi Province, the study. The results showed that the amount of nitrogen extracted from the soil by ion exchange membrane increased with the increase of incubation time, and was significantly correlated with the soil fertility index of soil total nitrogen, available nitrogen and soil phosphatase activity , And the correlation coefficients between the rate of nitrogen mineralization and the three soil fertility indices reached 0.850, 0.857 and 0.736 respectively after 30 days of culture. This method can be used to determine the rate of nitrogen mineralization more accurately. Four types of Hippophae rhamnoides plantation The order of the rate of nitrogen mineralization is: pure seabuckthorn> seabuckthorn × oil pine> seabuckthorn × acacia> seabuckthorn × arborvitae.