模拟氮沉降对西藏高山栎林地土壤理化性质的影响

发布时间：2019-04-12 20:18

【摘要】：以西藏林芝县布久乡朱曲登村高山栎林地为研究对象,于2014年7月份到2015年8月份原位模拟氮沉降(CK(对照)、LN低氮(25 kg·hm~(-2)·a~(-1))、MN中氮(50 kg·hm~(-2)·a~(-1))、HN高氮(150 kg·hm~(-2)·a~(-1)),探讨不同程度的氮沉降量对林地土壤养分和土壤可溶性有机碳质量分数的影响。结果表明:不同程度模拟氮沉降对林地有机质、全N、全P、全K、速效N、速效P、速效K、交换性Ca、交换性Mg质量分数和p H值以及可溶性有机碳质量分数都有显著影响(P0.05)。随着模拟氮沉降增加,0~20 cm林地土壤的交换性Mg和可溶性有机碳质量分数受到抑制;全K质量分数和p H值升高;有机质、全N和速效K质量分数在低氮处理下升高,在中高氮处理下降低;全P、速效N和速效P质量分数则在LN和HN处理下升高,在MN处理下降低;而交换性Ca质量分数在中高氮处理下升高后又在高氮处理下降低。
[Abstract]:The low nitrogen (25 kg 路hm ~ (- 2) a ~ (- 1),) of (CK (control), LN was simulated in situ from July 2014 to August 2015 by using Quercus alpine forest in Bujiu Township, Linzhi County, Tibet. The effects of nitrogen (50 kg 路hm ~ (- 2) a ~ (- 1), HN) and high nitrogen (150 kg 路hm ~ (- 2) a ~ (- 1),) on soil nutrients and soil soluble organic carbon content in MN were studied. The results showed that the effects of nitrogen deposition on organic matter, total N, total P, total K, available N, available P, available K, exchangeable Ca, were simulated in different degrees. Exchangeable Mg mass fraction, pH value and soluble organic carbon content had significant effects (P0.05). With the increase of simulated nitrogen deposition, the exchangeable Mg and soluble organic carbon content of 0 ~ 20 cm forest soil were inhibited, and the total K content and pH value were increased. The mass fraction of organic matter, total N and available K increased under low nitrogen treatment and decreased under medium and high nitrogen treatment, while the mass fraction of total P, available N and available P increased under LN and HN treatment, but decreased under MN treatment. The mass fraction of exchangeable Ca increased under medium and high nitrogen treatment and then decreased under high nitrogen treatment.
【作者单位】：西藏农牧学院;
【基金】：国家自然科学基金项目(31360119,31460112) 西藏农牧学院大学生创新性实验项目(2014,2015) 卓越农林人才教育培养计划改革试点项目-林学(2014)
【分类号】：S714.2

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