山核桃林坡地氮磷流失年动态规律初步研究

发布时间：2019-05-07 08:40

【摘要】：2016年6月至2017年5月,在浙江省临安市山核桃林闭合区底部沟壑出口处设置水土流失卡口,监测山核桃林坡面氮磷径流的年动态变化。结果表明,(1)山核桃林坡面径流量和降水量存在显著的线性正相关(y=1.351 0x+126.040 5,R~2=0.797 9),降水量越大,产生的径流量越大;(2)径流总氮(TN)浓度在2.50~3.21 mg·L~(-1),硝态氮(NO_3~--N)浓度变化幅度为0~2.26 mg·L~(-1),TN和NO_3~--N浓度的在6-8月呈递增趋势,而后下降,并保持相对稳定;径流氮元素浓度较高。(3)径流总磷(TP)浓度变化范围为0.01~0.09 mg·L~(-1),磷酸盐(PO_4~~(-3))浓度变化幅度为0.01~0.02 mg·L~(-1),径流磷元素浓度较低。
[Abstract]:From June 2016 to May 2017, soil and water loss clamps were set up at the bottom gully exit of the hickory forest closed area in Linan City, Zhejiang Province, to monitor the annual dynamic changes of nitrogen and phosphorus runoff on the slope of the pecan forest. The results showed that: (1) there was a significant linear positive correlation between runoff and precipitation on the slope surface of pecan forest (ya 1.3510 x 126.040, R ~ (2) = 0.797 9), and the greater the precipitation, the greater the runoff; (2) the total nitrogen concentration of runoff was 2.50 mg 路L ~ (- 1), and the concentration of nitrate nitrogen (NO_3~--N) was 0 ~ 2.26 mg 路L ~ (- 1), TN and NO_3~--N concentration increased gradually from June to August. The (TN) concentration of runoff was 2.50 ~ 3.21 mg 路L ~ (- 1), and the concentration of nitrate nitrogen (NO_3~--N) increased gradually from June to August. Then decreased and remained relatively stable; (3) the concentration of total phosphorus in runoff varied from 0.01 mg 路L ~ (- 1) to 0.09 mg 路L ~ (- 1), and the concentration of phosphate (PO_4~~ _ (- 3) varied from 0.01 ~ 0.02 mg 路L ~ (- 1) to 0.01 ~ (- 3) mg 路L ~ (- 1). The concentration of phosphorus in runoff was lower.
【作者单位】：浙江农林大学环境与资源学院;临安市林业局;
【基金】：浙江省水土保持监测中心项目(ZSSJ/CG-201603018)
【分类号】：S157;S664.1

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