低质林改造更新抚育系统养分的循环模拟

发布时间：2018-06-04 01:40

  本文选题：低质林 + 低质林改造　； 参考：《东北林业大学学报》2017年08期

【摘要】：依据低质林改造更新抚育系统的养分循环过程,采用内部集散物流分析、物质流分析方法,建立低质林改造更新抚育系统养分元素流动数学模型;应用实地调查数据对模型有效性验证后,运用模型对研究区内低质林更新阶段(2008—2015年)的营养元素积累与循环情况进行模拟分析。结果表明:通过营养元素流动模型得到的土壤养分指标,预测值与实测值之间的相关系数,水解N为0.87、有效P为0.77、速效K为0.88,显示了较高的模型精度。2008—2015年,更新系统通过降雨过程从系统外吸收的N、P、K,分别为320、28、120 kg/hm~(2);同时随径流流出系统的N、P、K,分别为224.0、19.6、84.0 kg/hm~(2)。林分从土壤中吸收的N、P、K,分别为26.45、4.29、11.11 kg/hm~(2);通过淋溶作用,归还到土壤中的N、P、K,分别为0.36、0.13、0.56 kg/hm~(2)。另外,幼龄林抚育措施及逐年累积的凋落物,回流至土壤中的N、P、K,分别为4.17、0.63、1.31 kg/hm~(2);土壤中累积的营养元素N、P、K,分别达到289.08、14.27、124.75 kg/hm~(2);比改造当年均有较大幅度的增加,表明低质林改造对于林地内的养分循环具有一定的促进作用。
[Abstract]:According to the nutrient cycling process of regeneration and tending system of low quality forest, the mathematical model of nutrient element flow in regeneration and tending system of low quality forest was established by means of internal distributed logistics analysis and material flow analysis. After the validity of the model was verified by field survey data, the nutrient accumulation and cycling of low-quality forest regeneration stage (2008-2015) in the study area were simulated and analyzed by using the model. The results showed that the correlation coefficient between the predicted value and the measured value was 0.87 for hydrolyzed N, 0.77 for available P and 0.88 for available K, which showed a high precision of the model from 2008 to 2015, the results showed that the soil nutrient index was obtained by the nutrient element flow model, and the correlation coefficient between the predicted value and the measured value was 0.87, 0.77 and 0.88 respectively. In the regeneration system, Nu Pu K absorbed from outside the system by rainfall process was 320 ~ 28120 kg / hm ~ (-1) N ~ (2 +) K, respectively, while the N ~ (2 +) P ~ (-1) K with runoff outflow system was 224.0 ~ (19.6kg) ~ (84. 0) kg 路hm ~ (-1) ~ 2 ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1). The N ~ (2 +) P ~ (+) K absorbed from the soil was 26.455 ~ 4.29 ~ 11.11 kg 路h ~ (-1) 路h ~ (-1) K, respectively, and the N ~ (2 +) P ~ (+) K was 0.36 ~ 0.13 ~ 0.56 kg 路h ~ (-1) ~ (-1) ~ 2 ~ (-1) 路h ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1), respectively. In addition, the annual accumulation of litter in young forest was 4.170.63 kg / kg 路hm ~ (2) K, respectively, and the accumulation of nutrient element in soil reached 289.08 ~ 14.27124.75 / kg / hm ~ (2), respectively, which was higher than that in the year of modification, and the amount of nutrient element in the soil was 289.08% ~ 14.27124.75 / kg / hm ~ (2), respectively, which was higher than that in the year of transformation, and the amount of nutrient element accumulated in the soil reached 289.08% 14.27124.75 / kg / hm ~ (2), respectively. The results showed that the transformation of low quality forest had a certain promoting effect on nutrient cycling in forest land.
【作者单位】： 东北林业大学;
【基金】：国家自然科学基金项目(31400539)
【分类号】：S756.5
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本文编号：1975250